arch/sparc: Optimized memcpy, memset, copy_to_user, copy_from_user for M7/M8
New algorithm that takes advantage of the M7/M8 block init store ASI, ie, overlapping pipelines and miss buffer filling. Full details in code comments. Signed-off-by: Babu Moger <babu.moger@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>zero-colors
Babu Moger
David S. Miller
parent
1ab326934f
commit
b3a04ed507
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@ -603,10 +603,10 @@ niagara_tlb_fixup:
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be,pt %xcc, niagara4_patch
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nop
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cmp %g1, SUN4V_CHIP_SPARC_M7
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be,pt %xcc, niagara4_patch
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be,pt %xcc, sparc_m7_patch
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nop
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cmp %g1, SUN4V_CHIP_SPARC_M8
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be,pt %xcc, niagara4_patch
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be,pt %xcc, sparc_m7_patch
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nop
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cmp %g1, SUN4V_CHIP_SPARC_SN
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be,pt %xcc, niagara4_patch
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@ -621,6 +621,18 @@ niagara_tlb_fixup:
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ba,a,pt %xcc, 80f
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nop
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sparc_m7_patch:
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call m7_patch_copyops
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nop
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call m7_patch_bzero
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nop
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call m7_patch_pageops
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nop
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ba,a,pt %xcc, 80f
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nop
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niagara4_patch:
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call niagara4_patch_copyops
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nop
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@ -0,0 +1,41 @@
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/*
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* M7copy_from_user.S: SPARC M7 optimized copy from userspace.
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*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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*/
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#define EX_LD(x) \
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98: x; \
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.section __ex_table,"a"; \
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.align 4; \
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.word 98b, __restore_asi; \
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.text; \
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.align 4;
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#define EX_LD_FP(x) \
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98: x; \
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.section __ex_table,"a"; \
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.align 4; \
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.word 98b, __restore_asi_fp; \
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.text; \
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.align 4;
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#ifndef ASI_AIUS
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#define ASI_AIUS 0x11
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#endif
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#define FUNC_NAME M7copy_from_user
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#define LOAD(type,addr,dest) type##a [addr] %asi, dest
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#define EX_RETVAL(x) 0
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#ifdef __KERNEL__
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#define PREAMBLE \
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rd %asi, %g1; \
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cmp %g1, ASI_AIUS; \
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bne,pn %icc, raw_copy_in_user; \
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nop
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#endif
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#include "M7memcpy.S"
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@ -0,0 +1,51 @@
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/*
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* M7copy_to_user.S: SPARC M7 optimized copy to userspace.
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*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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*/
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#define EX_ST(x) \
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98: x; \
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.section __ex_table,"a"; \
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.align 4; \
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.word 98b, __restore_asi; \
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.text; \
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.align 4;
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#define EX_ST_FP(x) \
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98: x; \
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.section __ex_table,"a"; \
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.align 4; \
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.word 98b, __restore_asi_fp; \
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.text; \
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.align 4;
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#ifndef ASI_AIUS
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#define ASI_AIUS 0x11
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#endif
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#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
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#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
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#endif
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#define FUNC_NAME M7copy_to_user
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#define STORE(type,src,addr) type##a src, [addr] %asi
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#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS
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#define STORE_MRU_ASI ASI_ST_BLKINIT_MRU_S
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#define EX_RETVAL(x) 0
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#ifdef __KERNEL__
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/* Writing to %asi is _expensive_ so we hardcode it.
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* Reading %asi to check for KERNEL_DS is comparatively
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* cheap.
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*/
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#define PREAMBLE \
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rd %asi, %g1; \
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cmp %g1, ASI_AIUS; \
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bne,pn %icc, raw_copy_in_user; \
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nop
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#endif
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#include "M7memcpy.S"
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@ -0,0 +1,923 @@
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/*
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* M7memcpy: Optimized SPARC M7 memcpy
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*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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*/
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.file "M7memcpy.S"
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/*
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* memcpy(s1, s2, len)
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*
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* Copy s2 to s1, always copy n bytes.
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* Note: this C code does not work for overlapped copies.
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*
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* Fast assembler language version of the following C-program for memcpy
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* which represents the `standard' for the C-library.
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*
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* void *
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* memcpy(void *s, const void *s0, size_t n)
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* {
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* if (n != 0) {
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* char *s1 = s;
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* const char *s2 = s0;
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* do {
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* *s1++ = *s2++;
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* } while (--n != 0);
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* }
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* return (s);
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* }
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*
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*
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* SPARC T7/M7 Flow :
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*
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* if (count < SMALL_MAX) {
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* if count < SHORTCOPY (SHORTCOPY=3)
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* copy bytes; exit with dst addr
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* if src & dst aligned on word boundary but not long word boundary,
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* copy with ldw/stw; branch to finish_up
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* if src & dst aligned on long word boundary
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* copy with ldx/stx; branch to finish_up
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* if src & dst not aligned and length <= SHORTCHECK (SHORTCHECK=14)
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* copy bytes; exit with dst addr
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* move enough bytes to get src to word boundary
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* if dst now on word boundary
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* move_words:
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* copy words; branch to finish_up
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* if dst now on half word boundary
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* load words, shift half words, store words; branch to finish_up
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* if dst on byte 1
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* load words, shift 3 bytes, store words; branch to finish_up
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* if dst on byte 3
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* load words, shift 1 byte, store words; branch to finish_up
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* finish_up:
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* copy bytes; exit with dst addr
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* } else { More than SMALL_MAX bytes
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* move bytes until dst is on long word boundary
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* if( src is on long word boundary ) {
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* if (count < MED_MAX) {
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* finish_long: src/dst aligned on 8 bytes
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* copy with ldx/stx in 8-way unrolled loop;
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* copy final 0-63 bytes; exit with dst addr
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* } else { src/dst aligned; count > MED_MAX
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* align dst on 64 byte boundary; for main data movement:
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* prefetch src data to L2 cache; let HW prefetch move data to L1 cache
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* Use BIS (block initializing store) to avoid copying store cache
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* lines from memory. But pre-store first element of each cache line
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* ST_CHUNK lines in advance of the rest of that cache line. That
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* gives time for replacement cache lines to be written back without
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* excess STQ and Miss Buffer filling. Repeat until near the end,
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* then finish up storing before going to finish_long.
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* }
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* } else { src/dst not aligned on 8 bytes
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* if src is word aligned and count < MED_WMAX
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* move words in 8-way unrolled loop
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* move final 0-31 bytes; exit with dst addr
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* if count < MED_UMAX
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* use alignaddr/faligndata combined with ldd/std in 8-way
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* unrolled loop to move data.
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* go to unalign_done
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* else
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* setup alignaddr for faligndata instructions
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* align dst on 64 byte boundary; prefetch src data to L1 cache
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* loadx8, falign, block-store, prefetch loop
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* (only use block-init-store when src/dst on 8 byte boundaries.)
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* unalign_done:
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* move remaining bytes for unaligned cases. exit with dst addr.
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* }
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*
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*/
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#include <asm/visasm.h>
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#include <asm/asi.h>
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#if !defined(EX_LD) && !defined(EX_ST)
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#define NON_USER_COPY
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#endif
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#ifndef EX_LD
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#define EX_LD(x) x
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#endif
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#ifndef EX_LD_FP
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#define EX_LD_FP(x) x
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#endif
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#ifndef EX_ST
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#define EX_ST(x) x
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#endif
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#ifndef EX_ST_FP
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#define EX_ST_FP(x) x
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#endif
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#ifndef EX_RETVAL
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#define EX_RETVAL(x) x
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#endif
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#ifndef LOAD
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#define LOAD(type,addr,dest) type [addr], dest
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#endif
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#ifndef STORE
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#define STORE(type,src,addr) type src, [addr]
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#endif
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/*
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* ASI_BLK_INIT_QUAD_LDD_P/ASI_BLK_INIT_QUAD_LDD_S marks the cache
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* line as "least recently used" which means if many threads are
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* active, it has a high probability of being pushed out of the cache
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* between the first initializing store and the final stores.
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* Thus, we use ASI_ST_BLKINIT_MRU_P/ASI_ST_BLKINIT_MRU_S which
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* marks the cache line as "most recently used" for all
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* but the last cache line
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*/
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#ifndef STORE_ASI
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#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
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#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_P
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#else
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#define STORE_ASI 0x80 /* ASI_P */
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#endif
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#endif
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#ifndef STORE_MRU_ASI
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#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
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#define STORE_MRU_ASI ASI_ST_BLKINIT_MRU_P
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#else
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#define STORE_MRU_ASI 0x80 /* ASI_P */
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#endif
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#endif
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#ifndef STORE_INIT
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#define STORE_INIT(src,addr) stxa src, [addr] STORE_ASI
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#endif
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#ifndef STORE_INIT_MRU
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#define STORE_INIT_MRU(src,addr) stxa src, [addr] STORE_MRU_ASI
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#endif
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#ifndef FUNC_NAME
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#define FUNC_NAME M7memcpy
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#endif
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#ifndef PREAMBLE
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#define PREAMBLE
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#endif
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#define BLOCK_SIZE 64
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#define SHORTCOPY 3
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#define SHORTCHECK 14
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#define SHORT_LONG 64 /* max copy for short longword-aligned case */
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/* must be at least 64 */
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#define SMALL_MAX 128
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#define MED_UMAX 1024 /* max copy for medium un-aligned case */
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#define MED_WMAX 1024 /* max copy for medium word-aligned case */
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#define MED_MAX 1024 /* max copy for medium longword-aligned case */
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#define ST_CHUNK 24 /* ST_CHUNK - block of values for BIS Store */
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#define ALIGN_PRE 24 /* distance for aligned prefetch loop */
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.register %g2,#scratch
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.section ".text"
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.global FUNC_NAME
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.type FUNC_NAME, #function
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.align 16
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FUNC_NAME:
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srlx %o2, 31, %g2
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cmp %g2, 0
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tne %xcc, 5
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PREAMBLE
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mov %o0, %g1 ! save %o0
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brz,pn %o2, .Lsmallx
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cmp %o2, 3
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ble,pn %icc, .Ltiny_cp
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cmp %o2, 19
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ble,pn %icc, .Lsmall_cp
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or %o0, %o1, %g2
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cmp %o2, SMALL_MAX
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bl,pn %icc, .Lmedium_cp
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nop
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.Lmedium:
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neg %o0, %o5
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andcc %o5, 7, %o5 ! bytes till DST 8 byte aligned
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brz,pt %o5, .Ldst_aligned_on_8
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! %o5 has the bytes to be written in partial store.
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sub %o2, %o5, %o2
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sub %o1, %o0, %o1 ! %o1 gets the difference
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7: ! dst aligning loop
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add %o1, %o0, %o4
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EX_LD(LOAD(ldub, %o4, %o4)) ! load one byte
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subcc %o5, 1, %o5
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EX_ST(STORE(stb, %o4, %o0))
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bgu,pt %xcc, 7b
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add %o0, 1, %o0 ! advance dst
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add %o1, %o0, %o1 ! restore %o1
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.Ldst_aligned_on_8:
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andcc %o1, 7, %o5
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brnz,pt %o5, .Lsrc_dst_unaligned_on_8
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nop
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.Lsrc_dst_aligned_on_8:
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! check if we are copying MED_MAX or more bytes
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set MED_MAX, %o3
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cmp %o2, %o3 ! limit to store buffer size
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bgu,pn %xcc, .Llarge_align8_copy
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nop
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/*
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* Special case for handling when src and dest are both long word aligned
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* and total data to move is less than MED_MAX bytes
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*/
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.Lmedlong:
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subcc %o2, 63, %o2 ! adjust length to allow cc test
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ble,pn %xcc, .Lmedl63 ! skip big loop if less than 64 bytes
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nop
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.Lmedl64:
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EX_LD(LOAD(ldx, %o1, %o4)) ! load
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subcc %o2, 64, %o2 ! decrement length count
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EX_ST(STORE(stx, %o4, %o0)) ! and store
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EX_LD(LOAD(ldx, %o1+8, %o3)) ! a block of 64 bytes
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EX_ST(STORE(stx, %o3, %o0+8))
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EX_LD(LOAD(ldx, %o1+16, %o4))
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EX_ST(STORE(stx, %o4, %o0+16))
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EX_LD(LOAD(ldx, %o1+24, %o3))
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EX_ST(STORE(stx, %o3, %o0+24))
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EX_LD(LOAD(ldx, %o1+32, %o4)) ! load
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EX_ST(STORE(stx, %o4, %o0+32)) ! and store
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EX_LD(LOAD(ldx, %o1+40, %o3)) ! a block of 64 bytes
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add %o1, 64, %o1 ! increase src ptr by 64
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EX_ST(STORE(stx, %o3, %o0+40))
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EX_LD(LOAD(ldx, %o1-16, %o4))
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add %o0, 64, %o0 ! increase dst ptr by 64
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EX_ST(STORE(stx, %o4, %o0-16))
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EX_LD(LOAD(ldx, %o1-8, %o3))
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bgu,pt %xcc, .Lmedl64 ! repeat if at least 64 bytes left
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EX_ST(STORE(stx, %o3, %o0-8))
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.Lmedl63:
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addcc %o2, 32, %o2 ! adjust remaining count
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ble,pt %xcc, .Lmedl31 ! to skip if 31 or fewer bytes left
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nop
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EX_LD(LOAD(ldx, %o1, %o4)) ! load
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sub %o2, 32, %o2 ! decrement length count
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EX_ST(STORE(stx, %o4, %o0)) ! and store
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EX_LD(LOAD(ldx, %o1+8, %o3)) ! a block of 32 bytes
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add %o1, 32, %o1 ! increase src ptr by 32
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EX_ST(STORE(stx, %o3, %o0+8))
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EX_LD(LOAD(ldx, %o1-16, %o4))
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add %o0, 32, %o0 ! increase dst ptr by 32
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EX_ST(STORE(stx, %o4, %o0-16))
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EX_LD(LOAD(ldx, %o1-8, %o3))
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EX_ST(STORE(stx, %o3, %o0-8))
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.Lmedl31:
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addcc %o2, 16, %o2 ! adjust remaining count
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ble,pt %xcc, .Lmedl15 ! skip if 15 or fewer bytes left
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nop !
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EX_LD(LOAD(ldx, %o1, %o4))
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add %o1, 16, %o1 ! increase src ptr by 16
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EX_ST(STORE(stx, %o4, %o0))
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sub %o2, 16, %o2 ! decrease count by 16
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EX_LD(LOAD(ldx, %o1-8, %o3))
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add %o0, 16, %o0 ! increase dst ptr by 16
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EX_ST(STORE(stx, %o3, %o0-8))
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.Lmedl15:
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addcc %o2, 15, %o2 ! restore count
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bz,pt %xcc, .Lsmallx ! exit if finished
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cmp %o2, 8
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blt,pt %xcc, .Lmedw7 ! skip if 7 or fewer bytes left
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tst %o2
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EX_LD(LOAD(ldx, %o1, %o4)) ! load 8 bytes
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add %o1, 8, %o1 ! increase src ptr by 8
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add %o0, 8, %o0 ! increase dst ptr by 8
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subcc %o2, 8, %o2 ! decrease count by 8
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bnz,pn %xcc, .Lmedw7
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EX_ST(STORE(stx, %o4, %o0-8)) ! and store 8 bytes
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retl
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mov EX_RETVAL(%g1), %o0 ! restore %o0
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.align 16
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.Lsrc_dst_unaligned_on_8:
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! DST is 8-byte aligned, src is not
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2:
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andcc %o1, 0x3, %o5 ! test word alignment
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bnz,pt %xcc, .Lunalignsetup ! branch to skip if not word aligned
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nop
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/*
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* Handle all cases where src and dest are aligned on word
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* boundaries. Use unrolled loops for better performance.
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* This option wins over standard large data move when
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* source and destination is in cache for.Lmedium
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* to short data moves.
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*/
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set MED_WMAX, %o3
|
||||
cmp %o2, %o3 ! limit to store buffer size
|
||||
bge,pt %xcc, .Lunalignrejoin ! otherwise rejoin main loop
|
||||
nop
|
||||
|
||||
subcc %o2, 31, %o2 ! adjust length to allow cc test
|
||||
! for end of loop
|
||||
ble,pt %xcc, .Lmedw31 ! skip big loop if less than 16
|
||||
.Lmedw32:
|
||||
EX_LD(LOAD(ld, %o1, %o4)) ! move a block of 32 bytes
|
||||
sllx %o4, 32, %o5
|
||||
EX_LD(LOAD(ld, %o1+4, %o4))
|
||||
or %o4, %o5, %o5
|
||||
EX_ST(STORE(stx, %o5, %o0))
|
||||
subcc %o2, 32, %o2 ! decrement length count
|
||||
EX_LD(LOAD(ld, %o1+8, %o4))
|
||||
sllx %o4, 32, %o5
|
||||
EX_LD(LOAD(ld, %o1+12, %o4))
|
||||
or %o4, %o5, %o5
|
||||
EX_ST(STORE(stx, %o5, %o0+8))
|
||||
add %o1, 32, %o1 ! increase src ptr by 32
|
||||
EX_LD(LOAD(ld, %o1-16, %o4))
|
||||
sllx %o4, 32, %o5
|
||||
EX_LD(LOAD(ld, %o1-12, %o4))
|
||||
or %o4, %o5, %o5
|
||||
EX_ST(STORE(stx, %o5, %o0+16))
|
||||
add %o0, 32, %o0 ! increase dst ptr by 32
|
||||
EX_LD(LOAD(ld, %o1-8, %o4))
|
||||
sllx %o4, 32, %o5
|
||||
EX_LD(LOAD(ld, %o1-4, %o4))
|
||||
or %o4, %o5, %o5
|
||||
bgu,pt %xcc, .Lmedw32 ! repeat if at least 32 bytes left
|
||||
EX_ST(STORE(stx, %o5, %o0-8))
|
||||
.Lmedw31:
|
||||
addcc %o2, 31, %o2 ! restore count
|
||||
|
||||
bz,pt %xcc, .Lsmallx ! exit if finished
|
||||
nop
|
||||
cmp %o2, 16
|
||||
blt,pt %xcc, .Lmedw15
|
||||
nop
|
||||
EX_LD(LOAD(ld, %o1, %o4)) ! move a block of 16 bytes
|
||||
sllx %o4, 32, %o5
|
||||
subcc %o2, 16, %o2 ! decrement length count
|
||||
EX_LD(LOAD(ld, %o1+4, %o4))
|
||||
or %o4, %o5, %o5
|
||||
EX_ST(STORE(stx, %o5, %o0))
|
||||
add %o1, 16, %o1 ! increase src ptr by 16
|
||||
EX_LD(LOAD(ld, %o1-8, %o4))
|
||||
add %o0, 16, %o0 ! increase dst ptr by 16
|
||||
sllx %o4, 32, %o5
|
||||
EX_LD(LOAD(ld, %o1-4, %o4))
|
||||
or %o4, %o5, %o5
|
||||
EX_ST(STORE(stx, %o5, %o0-8))
|
||||
.Lmedw15:
|
||||
bz,pt %xcc, .Lsmallx ! exit if finished
|
||||
cmp %o2, 8
|
||||
blt,pn %xcc, .Lmedw7 ! skip if 7 or fewer bytes left
|
||||
tst %o2
|
||||
EX_LD(LOAD(ld, %o1, %o4)) ! load 4 bytes
|
||||
subcc %o2, 8, %o2 ! decrease count by 8
|
||||
EX_ST(STORE(stw, %o4, %o0)) ! and store 4 bytes
|
||||
add %o1, 8, %o1 ! increase src ptr by 8
|
||||
EX_LD(LOAD(ld, %o1-4, %o3)) ! load 4 bytes
|
||||
add %o0, 8, %o0 ! increase dst ptr by 8
|
||||
EX_ST(STORE(stw, %o3, %o0-4)) ! and store 4 bytes
|
||||
bz,pt %xcc, .Lsmallx ! exit if finished
|
||||
.Lmedw7: ! count is ge 1, less than 8
|
||||
cmp %o2, 4 ! check for 4 bytes left
|
||||
blt,pn %xcc, .Lsmallleft3 ! skip if 3 or fewer bytes left
|
||||
nop !
|
||||
EX_LD(LOAD(ld, %o1, %o4)) ! load 4 bytes
|
||||
add %o1, 4, %o1 ! increase src ptr by 4
|
||||
add %o0, 4, %o0 ! increase dst ptr by 4
|
||||
subcc %o2, 4, %o2 ! decrease count by 4
|
||||
bnz .Lsmallleft3
|
||||
EX_ST(STORE(stw, %o4, %o0-4))! and store 4 bytes
|
||||
retl
|
||||
mov EX_RETVAL(%g1), %o0
|
||||
|
||||
.align 16
|
||||
.Llarge_align8_copy: ! Src and dst share 8 byte alignment
|
||||
! align dst to 64 byte boundary
|
||||
andcc %o0, 0x3f, %o3 ! %o3 == 0 means dst is 64 byte aligned
|
||||
brz,pn %o3, .Laligned_to_64
|
||||
andcc %o0, 8, %o3 ! odd long words to move?
|
||||
brz,pt %o3, .Laligned_to_16
|
||||
nop
|
||||
EX_LD(LOAD(ldx, %o1, %o4))
|
||||
sub %o2, 8, %o2
|
||||
add %o1, 8, %o1 ! increment src ptr
|
||||
add %o0, 8, %o0 ! increment dst ptr
|
||||
EX_ST(STORE(stx, %o4, %o0-8))
|
||||
.Laligned_to_16:
|
||||
andcc %o0, 16, %o3 ! pair of long words to move?
|
||||
brz,pt %o3, .Laligned_to_32
|
||||
nop
|
||||
EX_LD(LOAD(ldx, %o1, %o4))
|
||||
sub %o2, 16, %o2
|
||||
EX_ST(STORE(stx, %o4, %o0))
|
||||
add %o1, 16, %o1 ! increment src ptr
|
||||
EX_LD(LOAD(ldx, %o1-8, %o4))
|
||||
add %o0, 16, %o0 ! increment dst ptr
|
||||
EX_ST(STORE(stx, %o4, %o0-8))
|
||||
.Laligned_to_32:
|
||||
andcc %o0, 32, %o3 ! four long words to move?
|
||||
brz,pt %o3, .Laligned_to_64
|
||||
nop
|
||||
EX_LD(LOAD(ldx, %o1, %o4))
|
||||
sub %o2, 32, %o2
|
||||
EX_ST(STORE(stx, %o4, %o0))
|
||||
EX_LD(LOAD(ldx, %o1+8, %o4))
|
||||
EX_ST(STORE(stx, %o4, %o0+8))
|
||||
EX_LD(LOAD(ldx, %o1+16, %o4))
|
||||
EX_ST(STORE(stx, %o4, %o0+16))
|
||||
add %o1, 32, %o1 ! increment src ptr
|
||||
EX_LD(LOAD(ldx, %o1-8, %o4))
|
||||
add %o0, 32, %o0 ! increment dst ptr
|
||||
EX_ST(STORE(stx, %o4, %o0-8))
|
||||
.Laligned_to_64:
|
||||
!
|
||||
! Using block init store (BIS) instructions to avoid fetching cache
|
||||
! lines from memory. Use ST_CHUNK stores to first element of each cache
|
||||
! line (similar to prefetching) to avoid overfilling STQ or miss buffers.
|
||||
! Gives existing cache lines time to be moved out of L1/L2/L3 cache.
|
||||
! Initial stores using MRU version of BIS to keep cache line in
|
||||
! cache until we are ready to store final element of cache line.
|
||||
! Then store last element using the LRU version of BIS.
|
||||
!
|
||||
andn %o2, 0x3f, %o5 ! %o5 is multiple of block size
|
||||
and %o2, 0x3f, %o2 ! residue bytes in %o2
|
||||
!
|
||||
! We use STORE_MRU_ASI for the first seven stores to each cache line
|
||||
! followed by STORE_ASI (mark as LRU) for the last store. That
|
||||
! mixed approach reduces the probability that the cache line is removed
|
||||
! before we finish setting it, while minimizing the effects on
|
||||
! other cached values during a large memcpy
|
||||
!
|
||||
! ST_CHUNK batches up initial BIS operations for several cache lines
|
||||
! to allow multiple requests to not be blocked by overflowing the
|
||||
! the store miss buffer. Then the matching stores for all those
|
||||
! BIS operations are executed.
|
||||
!
|
||||
|
||||
sub %o0, 8, %o0 ! adjust %o0 for ASI alignment
|
||||
.Lalign_loop:
|
||||
cmp %o5, ST_CHUNK*64
|
||||
blu,pt %xcc, .Lalign_loop_fin
|
||||
mov ST_CHUNK,%o3
|
||||
.Lalign_loop_start:
|
||||
prefetch [%o1 + (ALIGN_PRE * BLOCK_SIZE)], 21
|
||||
subcc %o3, 1, %o3
|
||||
EX_LD(LOAD(ldx, %o1, %o4))
|
||||
add %o1, 64, %o1
|
||||
add %o0, 8, %o0
|
||||
EX_ST(STORE_INIT_MRU(%o4, %o0))
|
||||
bgu %xcc,.Lalign_loop_start
|
||||
add %o0, 56, %o0
|
||||
|
||||
mov ST_CHUNK,%o3
|
||||
sllx %o3, 6, %o4 ! ST_CHUNK*64
|
||||
sub %o1, %o4, %o1 ! reset %o1
|
||||
sub %o0, %o4, %o0 ! reset %o0
|
||||
|
||||
.Lalign_loop_rest:
|
||||
EX_LD(LOAD(ldx, %o1+8, %o4))
|
||||
add %o0, 16, %o0
|
||||
EX_ST(STORE_INIT_MRU(%o4, %o0))
|
||||
EX_LD(LOAD(ldx, %o1+16, %o4))
|
||||
add %o0, 8, %o0
|
||||
EX_ST(STORE_INIT_MRU(%o4, %o0))
|
||||
subcc %o3, 1, %o3
|
||||
EX_LD(LOAD(ldx, %o1+24, %o4))
|
||||
add %o0, 8, %o0
|
||||
EX_ST(STORE_INIT_MRU(%o4, %o0))
|
||||
EX_LD(LOAD(ldx, %o1+32, %o4))
|
||||
add %o0, 8, %o0
|
||||
EX_ST(STORE_INIT_MRU(%o4, %o0))
|
||||
EX_LD(LOAD(ldx, %o1+40, %o4))
|
||||
add %o0, 8, %o0
|
||||
EX_ST(STORE_INIT_MRU(%o4, %o0))
|
||||
EX_LD(LOAD(ldx, %o1+48, %o4))
|
||||
add %o1, 64, %o1
|
||||
add %o0, 8, %o0
|
||||
EX_ST(STORE_INIT_MRU(%o4, %o0))
|
||||
add %o0, 8, %o0
|
||||
EX_LD(LOAD(ldx, %o1-8, %o4))
|
||||
sub %o5, 64, %o5
|
||||
bgu %xcc,.Lalign_loop_rest
|
||||
! mark cache line as LRU
|
||||
EX_ST(STORE_INIT(%o4, %o0))
|
||||
|
||||
cmp %o5, ST_CHUNK*64
|
||||
bgu,pt %xcc, .Lalign_loop_start
|
||||
mov ST_CHUNK,%o3
|
||||
|
||||
cmp %o5, 0
|
||||
beq .Lalign_done
|
||||
nop
|
||||
.Lalign_loop_fin:
|
||||
EX_LD(LOAD(ldx, %o1, %o4))
|
||||
EX_ST(STORE(stx, %o4, %o0+8))
|
||||
EX_LD(LOAD(ldx, %o1+8, %o4))
|
||||
EX_ST(STORE(stx, %o4, %o0+8+8))
|
||||
EX_LD(LOAD(ldx, %o1+16, %o4))
|
||||
EX_ST(STORE(stx, %o4, %o0+8+16))
|
||||
subcc %o5, 64, %o5
|
||||
EX_LD(LOAD(ldx, %o1+24, %o4))
|
||||
EX_ST(STORE(stx, %o4, %o0+8+24))
|
||||
EX_LD(LOAD(ldx, %o1+32, %o4))
|
||||
EX_ST(STORE(stx, %o4, %o0+8+32))
|
||||
EX_LD(LOAD(ldx, %o1+40, %o4))
|
||||
EX_ST(STORE(stx, %o4, %o0+8+40))
|
||||
EX_LD(LOAD(ldx, %o1+48, %o4))
|
||||
add %o1, 64, %o1
|
||||
EX_ST(STORE(stx, %o4, %o0+8+48))
|
||||
add %o0, 64, %o0
|
||||
EX_LD(LOAD(ldx, %o1-8, %o4))
|
||||
bgu %xcc,.Lalign_loop_fin
|
||||
EX_ST(STORE(stx, %o4, %o0))
|
||||
|
||||
.Lalign_done:
|
||||
add %o0, 8, %o0 ! restore %o0 from ASI alignment
|
||||
membar #StoreStore
|
||||
sub %o2, 63, %o2 ! adjust length to allow cc test
|
||||
ba .Lmedl63 ! in .Lmedl63
|
||||
nop
|
||||
|
||||
.align 16
|
||||
! Dst is on 8 byte boundary; src is not; remaining count > SMALL_MAX
|
||||
.Lunalignsetup:
|
||||
.Lunalignrejoin:
|
||||
mov %g1, %o3 ! save %g1 as VISEntryHalf clobbers it
|
||||
#ifdef NON_USER_COPY
|
||||
VISEntryHalfFast(.Lmedium_vis_entry_fail_cp)
|
||||
#else
|
||||
VISEntryHalf
|
||||
#endif
|
||||
mov %o3, %g1 ! restore %g1
|
||||
|
||||
set MED_UMAX, %o3
|
||||
cmp %o2, %o3 ! check for.Lmedium unaligned limit
|
||||
bge,pt %xcc,.Lunalign_large
|
||||
prefetch [%o1 + (4 * BLOCK_SIZE)], 20
|
||||
andn %o2, 0x3f, %o5 ! %o5 is multiple of block size
|
||||
and %o2, 0x3f, %o2 ! residue bytes in %o2
|
||||
cmp %o2, 8 ! Insure we do not load beyond
|
||||
bgt .Lunalign_adjust ! end of source buffer
|
||||
andn %o1, 0x7, %o4 ! %o4 has long word aligned src address
|
||||
add %o2, 64, %o2 ! adjust to leave loop
|
||||
sub %o5, 64, %o5 ! early if necessary
|
||||
.Lunalign_adjust:
|
||||
alignaddr %o1, %g0, %g0 ! generate %gsr
|
||||
add %o1, %o5, %o1 ! advance %o1 to after blocks
|
||||
EX_LD_FP(LOAD(ldd, %o4, %f0))
|
||||
.Lunalign_loop:
|
||||
EX_LD_FP(LOAD(ldd, %o4+8, %f2))
|
||||
faligndata %f0, %f2, %f16
|
||||
EX_LD_FP(LOAD(ldd, %o4+16, %f4))
|
||||
subcc %o5, BLOCK_SIZE, %o5
|
||||
EX_ST_FP(STORE(std, %f16, %o0))
|
||||
faligndata %f2, %f4, %f18
|
||||
EX_LD_FP(LOAD(ldd, %o4+24, %f6))
|
||||
EX_ST_FP(STORE(std, %f18, %o0+8))
|
||||
faligndata %f4, %f6, %f20
|
||||
EX_LD_FP(LOAD(ldd, %o4+32, %f8))
|
||||
EX_ST_FP(STORE(std, %f20, %o0+16))
|
||||
faligndata %f6, %f8, %f22
|
||||
EX_LD_FP(LOAD(ldd, %o4+40, %f10))
|
||||
EX_ST_FP(STORE(std, %f22, %o0+24))
|
||||
faligndata %f8, %f10, %f24
|
||||
EX_LD_FP(LOAD(ldd, %o4+48, %f12))
|
||||
EX_ST_FP(STORE(std, %f24, %o0+32))
|
||||
faligndata %f10, %f12, %f26
|
||||
EX_LD_FP(LOAD(ldd, %o4+56, %f14))
|
||||
add %o4, BLOCK_SIZE, %o4
|
||||
EX_ST_FP(STORE(std, %f26, %o0+40))
|
||||
faligndata %f12, %f14, %f28
|
||||
EX_LD_FP(LOAD(ldd, %o4, %f0))
|
||||
EX_ST_FP(STORE(std, %f28, %o0+48))
|
||||
faligndata %f14, %f0, %f30
|
||||
EX_ST_FP(STORE(std, %f30, %o0+56))
|
||||
add %o0, BLOCK_SIZE, %o0
|
||||
bgu,pt %xcc, .Lunalign_loop
|
||||
prefetch [%o4 + (5 * BLOCK_SIZE)], 20
|
||||
ba .Lunalign_done
|
||||
nop
|
||||
|
||||
.Lunalign_large:
|
||||
andcc %o0, 0x3f, %o3 ! is dst 64-byte block aligned?
|
||||
bz %xcc, .Lunalignsrc
|
||||
sub %o3, 64, %o3 ! %o3 will be multiple of 8
|
||||
neg %o3 ! bytes until dest is 64 byte aligned
|
||||
sub %o2, %o3, %o2 ! update cnt with bytes to be moved
|
||||
! Move bytes according to source alignment
|
||||
andcc %o1, 0x1, %o5
|
||||
bnz %xcc, .Lunalignbyte ! check for byte alignment
|
||||
nop
|
||||
andcc %o1, 2, %o5 ! check for half word alignment
|
||||
bnz %xcc, .Lunalignhalf
|
||||
nop
|
||||
! Src is word aligned
|
||||
.Lunalignword:
|
||||
EX_LD_FP(LOAD(ld, %o1, %o4)) ! load 4 bytes
|
||||
add %o1, 8, %o1 ! increase src ptr by 8
|
||||
EX_ST_FP(STORE(stw, %o4, %o0)) ! and store 4 bytes
|
||||
subcc %o3, 8, %o3 ! decrease count by 8
|
||||
EX_LD_FP(LOAD(ld, %o1-4, %o4)) ! load 4 bytes
|
||||
add %o0, 8, %o0 ! increase dst ptr by 8
|
||||
bnz %xcc, .Lunalignword
|
||||
EX_ST_FP(STORE(stw, %o4, %o0-4))! and store 4 bytes
|
||||
ba .Lunalignsrc
|
||||
nop
|
||||
|
||||
! Src is half-word aligned
|
||||
.Lunalignhalf:
|
||||
EX_LD_FP(LOAD(lduh, %o1, %o4)) ! load 2 bytes
|
||||
sllx %o4, 32, %o5 ! shift left
|
||||
EX_LD_FP(LOAD(lduw, %o1+2, %o4))
|
||||
or %o4, %o5, %o5
|
||||
sllx %o5, 16, %o5
|
||||
EX_LD_FP(LOAD(lduh, %o1+6, %o4))
|
||||
or %o4, %o5, %o5
|
||||
EX_ST_FP(STORE(stx, %o5, %o0))
|
||||
add %o1, 8, %o1
|
||||
subcc %o3, 8, %o3
|
||||
bnz %xcc, .Lunalignhalf
|
||||
add %o0, 8, %o0
|
||||
ba .Lunalignsrc
|
||||
nop
|
||||
|
||||
! Src is Byte aligned
|
||||
.Lunalignbyte:
|
||||
sub %o0, %o1, %o0 ! share pointer advance
|
||||
.Lunalignbyte_loop:
|
||||
EX_LD_FP(LOAD(ldub, %o1, %o4))
|
||||
sllx %o4, 56, %o5
|
||||
EX_LD_FP(LOAD(lduh, %o1+1, %o4))
|
||||
sllx %o4, 40, %o4
|
||||
or %o4, %o5, %o5
|
||||
EX_LD_FP(LOAD(lduh, %o1+3, %o4))
|
||||
sllx %o4, 24, %o4
|
||||
or %o4, %o5, %o5
|
||||
EX_LD_FP(LOAD(lduh, %o1+5, %o4))
|
||||
sllx %o4, 8, %o4
|
||||
or %o4, %o5, %o5
|
||||
EX_LD_FP(LOAD(ldub, %o1+7, %o4))
|
||||
or %o4, %o5, %o5
|
||||
add %o0, %o1, %o0
|
||||
EX_ST_FP(STORE(stx, %o5, %o0))
|
||||
sub %o0, %o1, %o0
|
||||
subcc %o3, 8, %o3
|
||||
bnz %xcc, .Lunalignbyte_loop
|
||||
add %o1, 8, %o1
|
||||
add %o0,%o1, %o0 ! restore pointer
|
||||
|
||||
! Destination is now block (64 byte aligned)
|
||||
.Lunalignsrc:
|
||||
andn %o2, 0x3f, %o5 ! %o5 is multiple of block size
|
||||
and %o2, 0x3f, %o2 ! residue bytes in %o2
|
||||
add %o2, 64, %o2 ! Insure we do not load beyond
|
||||
sub %o5, 64, %o5 ! end of source buffer
|
||||
|
||||
andn %o1, 0x7, %o4 ! %o4 has long word aligned src address
|
||||
alignaddr %o1, %g0, %g0 ! generate %gsr
|
||||
add %o1, %o5, %o1 ! advance %o1 to after blocks
|
||||
|
||||
EX_LD_FP(LOAD(ldd, %o4, %f14))
|
||||
add %o4, 8, %o4
|
||||
.Lunalign_sloop:
|
||||
EX_LD_FP(LOAD(ldd, %o4, %f16))
|
||||
faligndata %f14, %f16, %f0
|
||||
EX_LD_FP(LOAD(ldd, %o4+8, %f18))
|
||||
faligndata %f16, %f18, %f2
|
||||
EX_LD_FP(LOAD(ldd, %o4+16, %f20))
|
||||
faligndata %f18, %f20, %f4
|
||||
EX_ST_FP(STORE(std, %f0, %o0))
|
||||
subcc %o5, 64, %o5
|
||||
EX_LD_FP(LOAD(ldd, %o4+24, %f22))
|
||||
faligndata %f20, %f22, %f6
|
||||
EX_ST_FP(STORE(std, %f2, %o0+8))
|
||||
EX_LD_FP(LOAD(ldd, %o4+32, %f24))
|
||||
faligndata %f22, %f24, %f8
|
||||
EX_ST_FP(STORE(std, %f4, %o0+16))
|
||||
EX_LD_FP(LOAD(ldd, %o4+40, %f26))
|
||||
faligndata %f24, %f26, %f10
|
||||
EX_ST_FP(STORE(std, %f6, %o0+24))
|
||||
EX_LD_FP(LOAD(ldd, %o4+48, %f28))
|
||||
faligndata %f26, %f28, %f12
|
||||
EX_ST_FP(STORE(std, %f8, %o0+32))
|
||||
add %o4, 64, %o4
|
||||
EX_LD_FP(LOAD(ldd, %o4-8, %f30))
|
||||
faligndata %f28, %f30, %f14
|
||||
EX_ST_FP(STORE(std, %f10, %o0+40))
|
||||
EX_ST_FP(STORE(std, %f12, %o0+48))
|
||||
add %o0, 64, %o0
|
||||
EX_ST_FP(STORE(std, %f14, %o0-8))
|
||||
fsrc2 %f30, %f14
|
||||
bgu,pt %xcc, .Lunalign_sloop
|
||||
prefetch [%o4 + (8 * BLOCK_SIZE)], 20
|
||||
|
||||
.Lunalign_done:
|
||||
! Handle trailing bytes, 64 to 127
|
||||
! Dest long word aligned, Src not long word aligned
|
||||
cmp %o2, 15
|
||||
bleu %xcc, .Lunalign_short
|
||||
|
||||
andn %o2, 0x7, %o5 ! %o5 is multiple of 8
|
||||
and %o2, 0x7, %o2 ! residue bytes in %o2
|
||||
add %o2, 8, %o2
|
||||
sub %o5, 8, %o5 ! insure we do not load past end of src
|
||||
andn %o1, 0x7, %o4 ! %o4 has long word aligned src address
|
||||
add %o1, %o5, %o1 ! advance %o1 to after multiple of 8
|
||||
EX_LD_FP(LOAD(ldd, %o4, %f0)) ! fetch partial word
|
||||
.Lunalign_by8:
|
||||
EX_LD_FP(LOAD(ldd, %o4+8, %f2))
|
||||
add %o4, 8, %o4
|
||||
faligndata %f0, %f2, %f16
|
||||
subcc %o5, 8, %o5
|
||||
EX_ST_FP(STORE(std, %f16, %o0))
|
||||
fsrc2 %f2, %f0
|
||||
bgu,pt %xcc, .Lunalign_by8
|
||||
add %o0, 8, %o0
|
||||
|
||||
.Lunalign_short:
|
||||
#ifdef NON_USER_COPY
|
||||
VISExitHalfFast
|
||||
#else
|
||||
VISExitHalf
|
||||
#endif
|
||||
ba .Lsmallrest
|
||||
nop
|
||||
|
||||
/*
|
||||
* This is a special case of nested memcpy. This can happen when kernel
|
||||
* calls unaligned memcpy back to back without saving FP registers. We need
|
||||
* traps(context switch) to save/restore FP registers. If the kernel calls
|
||||
* memcpy without this trap sequence we will hit FP corruption. Let's use
|
||||
* the normal integer load/store method in this case.
|
||||
*/
|
||||
|
||||
#ifdef NON_USER_COPY
|
||||
.Lmedium_vis_entry_fail_cp:
|
||||
or %o0, %o1, %g2
|
||||
#endif
|
||||
.Lmedium_cp:
|
||||
LOAD(prefetch, %o1 + 0x40, #n_reads_strong)
|
||||
andcc %g2, 0x7, %g0
|
||||
bne,pn %xcc, .Lmedium_unaligned_cp
|
||||
nop
|
||||
|
||||
.Lmedium_noprefetch_cp:
|
||||
andncc %o2, 0x20 - 1, %o5
|
||||
be,pn %xcc, 2f
|
||||
sub %o2, %o5, %o2
|
||||
1: EX_LD(LOAD(ldx, %o1 + 0x00, %o3))
|
||||
EX_LD(LOAD(ldx, %o1 + 0x08, %g2))
|
||||
EX_LD(LOAD(ldx, %o1 + 0x10, %g7))
|
||||
EX_LD(LOAD(ldx, %o1 + 0x18, %o4))
|
||||
add %o1, 0x20, %o1
|
||||
subcc %o5, 0x20, %o5
|
||||
EX_ST(STORE(stx, %o3, %o0 + 0x00))
|
||||
EX_ST(STORE(stx, %g2, %o0 + 0x08))
|
||||
EX_ST(STORE(stx, %g7, %o0 + 0x10))
|
||||
EX_ST(STORE(stx, %o4, %o0 + 0x18))
|
||||
bne,pt %xcc, 1b
|
||||
add %o0, 0x20, %o0
|
||||
2: andcc %o2, 0x18, %o5
|
||||
be,pt %xcc, 3f
|
||||
sub %o2, %o5, %o2
|
||||
1: EX_LD(LOAD(ldx, %o1 + 0x00, %o3))
|
||||
add %o1, 0x08, %o1
|
||||
add %o0, 0x08, %o0
|
||||
subcc %o5, 0x08, %o5
|
||||
bne,pt %xcc, 1b
|
||||
EX_ST(STORE(stx, %o3, %o0 - 0x08))
|
||||
3: brz,pt %o2, .Lexit_cp
|
||||
cmp %o2, 0x04
|
||||
bl,pn %xcc, .Ltiny_cp
|
||||
nop
|
||||
EX_LD(LOAD(lduw, %o1 + 0x00, %o3))
|
||||
add %o1, 0x04, %o1
|
||||
add %o0, 0x04, %o0
|
||||
subcc %o2, 0x04, %o2
|
||||
bne,pn %xcc, .Ltiny_cp
|
||||
EX_ST(STORE(stw, %o3, %o0 - 0x04))
|
||||
ba,a,pt %xcc, .Lexit_cp
|
||||
|
||||
.Lmedium_unaligned_cp:
|
||||
/* First get dest 8 byte aligned. */
|
||||
sub %g0, %o0, %o3
|
||||
and %o3, 0x7, %o3
|
||||
brz,pt %o3, 2f
|
||||
sub %o2, %o3, %o2
|
||||
|
||||
1: EX_LD(LOAD(ldub, %o1 + 0x00, %g2))
|
||||
add %o1, 1, %o1
|
||||
subcc %o3, 1, %o3
|
||||
add %o0, 1, %o0
|
||||
bne,pt %xcc, 1b
|
||||
EX_ST(STORE(stb, %g2, %o0 - 0x01))
|
||||
2:
|
||||
and %o1, 0x7, %o3
|
||||
brz,pn %o3, .Lmedium_noprefetch_cp
|
||||
sll %o3, 3, %o3
|
||||
mov 64, %g2
|
||||
sub %g2, %o3, %g2
|
||||
andn %o1, 0x7, %o1
|
||||
EX_LD(LOAD(ldx, %o1 + 0x00, %o4))
|
||||
sllx %o4, %o3, %o4
|
||||
andn %o2, 0x08 - 1, %o5
|
||||
sub %o2, %o5, %o2
|
||||
|
||||
1: EX_LD(LOAD(ldx, %o1 + 0x08, %g3))
|
||||
add %o1, 0x08, %o1
|
||||
subcc %o5, 0x08, %o5
|
||||
srlx %g3, %g2, %g7
|
||||
or %g7, %o4, %g7
|
||||
EX_ST(STORE(stx, %g7, %o0 + 0x00))
|
||||
add %o0, 0x08, %o0
|
||||
bne,pt %xcc, 1b
|
||||
sllx %g3, %o3, %o4
|
||||
srl %o3, 3, %o3
|
||||
add %o1, %o3, %o1
|
||||
brz,pn %o2, .Lexit_cp
|
||||
nop
|
||||
ba,pt %xcc, .Lsmall_unaligned_cp
|
||||
|
||||
.Ltiny_cp:
|
||||
EX_LD(LOAD(ldub, %o1 + 0x00, %o3))
|
||||
subcc %o2, 1, %o2
|
||||
be,pn %xcc, .Lexit_cp
|
||||
EX_ST(STORE(stb, %o3, %o0 + 0x00))
|
||||
EX_LD(LOAD(ldub, %o1 + 0x01, %o3))
|
||||
subcc %o2, 1, %o2
|
||||
be,pn %xcc, .Lexit_cp
|
||||
EX_ST(STORE(stb, %o3, %o0 + 0x01))
|
||||
EX_LD(LOAD(ldub, %o1 + 0x02, %o3))
|
||||
ba,pt %xcc, .Lexit_cp
|
||||
EX_ST(STORE(stb, %o3, %o0 + 0x02))
|
||||
|
||||
.Lsmall_cp:
|
||||
andcc %g2, 0x3, %g0
|
||||
bne,pn %xcc, .Lsmall_unaligned_cp
|
||||
andn %o2, 0x4 - 1, %o5
|
||||
sub %o2, %o5, %o2
|
||||
1:
|
||||
EX_LD(LOAD(lduw, %o1 + 0x00, %o3))
|
||||
add %o1, 0x04, %o1
|
||||
subcc %o5, 0x04, %o5
|
||||
add %o0, 0x04, %o0
|
||||
bne,pt %xcc, 1b
|
||||
EX_ST(STORE(stw, %o3, %o0 - 0x04))
|
||||
brz,pt %o2, .Lexit_cp
|
||||
nop
|
||||
ba,a,pt %xcc, .Ltiny_cp
|
||||
|
||||
.Lsmall_unaligned_cp:
|
||||
1: EX_LD(LOAD(ldub, %o1 + 0x00, %o3))
|
||||
add %o1, 1, %o1
|
||||
add %o0, 1, %o0
|
||||
subcc %o2, 1, %o2
|
||||
bne,pt %xcc, 1b
|
||||
EX_ST(STORE(stb, %o3, %o0 - 0x01))
|
||||
ba,a,pt %xcc, .Lexit_cp
|
||||
|
||||
.Lsmallrest:
|
||||
tst %o2
|
||||
bz,pt %xcc, .Lsmallx
|
||||
cmp %o2, 4
|
||||
blt,pn %xcc, .Lsmallleft3
|
||||
nop
|
||||
sub %o2, 3, %o2
|
||||
.Lsmallnotalign4:
|
||||
EX_LD(LOAD(ldub, %o1, %o3))! read byte
|
||||
subcc %o2, 4, %o2 ! reduce count by 4
|
||||
EX_ST(STORE(stb, %o3, %o0)) ! write byte
|
||||
EX_LD(LOAD(ldub, %o1+1, %o3))! repeat for total of 4 bytes
|
||||
add %o1, 4, %o1 ! advance SRC by 4
|
||||
EX_ST(STORE(stb, %o3, %o0+1))
|
||||
EX_LD(LOAD(ldub, %o1-2, %o3))
|
||||
add %o0, 4, %o0 ! advance DST by 4
|
||||
EX_ST(STORE(stb, %o3, %o0-2))
|
||||
EX_LD(LOAD(ldub, %o1-1, %o3))
|
||||
bgu,pt %xcc, .Lsmallnotalign4 ! loop til 3 or fewer bytes remain
|
||||
EX_ST(STORE(stb, %o3, %o0-1))
|
||||
addcc %o2, 3, %o2 ! restore count
|
||||
bz,pt %xcc, .Lsmallx
|
||||
.Lsmallleft3: ! 1, 2, or 3 bytes remain
|
||||
subcc %o2, 1, %o2
|
||||
EX_LD(LOAD(ldub, %o1, %o3)) ! load one byte
|
||||
bz,pt %xcc, .Lsmallx
|
||||
EX_ST(STORE(stb, %o3, %o0)) ! store one byte
|
||||
EX_LD(LOAD(ldub, %o1+1, %o3)) ! load second byte
|
||||
subcc %o2, 1, %o2
|
||||
bz,pt %xcc, .Lsmallx
|
||||
EX_ST(STORE(stb, %o3, %o0+1))! store second byte
|
||||
EX_LD(LOAD(ldub, %o1+2, %o3)) ! load third byte
|
||||
EX_ST(STORE(stb, %o3, %o0+2)) ! store third byte
|
||||
.Lsmallx:
|
||||
retl
|
||||
mov EX_RETVAL(%g1), %o0
|
||||
.Lsmallfin:
|
||||
tst %o2
|
||||
bnz,pn %xcc, .Lsmallleft3
|
||||
nop
|
||||
retl
|
||||
mov EX_RETVAL(%g1), %o0 ! restore %o0
|
||||
.Lexit_cp:
|
||||
retl
|
||||
mov EX_RETVAL(%g1), %o0
|
||||
.size FUNC_NAME, .-FUNC_NAME
|
||||
|
|
@ -0,0 +1,352 @@
|
|||
/*
|
||||
* M7memset.S: SPARC M7 optimized memset.
|
||||
*
|
||||
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
|
||||
*/
|
||||
|
||||
/*
|
||||
* M7memset.S: M7 optimized memset.
|
||||
*
|
||||
* char *memset(sp, c, n)
|
||||
*
|
||||
* Set an array of n chars starting at sp to the character c.
|
||||
* Return sp.
|
||||
*
|
||||
* Fast assembler language version of the following C-program for memset
|
||||
* which represents the `standard' for the C-library.
|
||||
*
|
||||
* void *
|
||||
* memset(void *sp1, int c, size_t n)
|
||||
* {
|
||||
* if (n != 0) {
|
||||
* char *sp = sp1;
|
||||
* do {
|
||||
* *sp++ = (char)c;
|
||||
* } while (--n != 0);
|
||||
* }
|
||||
* return (sp1);
|
||||
* }
|
||||
*
|
||||
* The algorithm is as follows :
|
||||
*
|
||||
* For small 6 or fewer bytes stores, bytes will be stored.
|
||||
*
|
||||
* For less than 32 bytes stores, align the address on 4 byte boundary.
|
||||
* Then store as many 4-byte chunks, followed by trailing bytes.
|
||||
*
|
||||
* For sizes greater than 32 bytes, align the address on 8 byte boundary.
|
||||
* if (count >= 64) {
|
||||
* store 8-bytes chunks to align the address on 64 byte boundary
|
||||
* if (value to be set is zero && count >= MIN_ZERO) {
|
||||
* Using BIS stores, set the first long word of each
|
||||
* 64-byte cache line to zero which will also clear the
|
||||
* other seven long words of the cache line.
|
||||
* }
|
||||
* else if (count >= MIN_LOOP) {
|
||||
* Using BIS stores, set the first long word of each of
|
||||
* ST_CHUNK cache lines (64 bytes each) before the main
|
||||
* loop is entered.
|
||||
* In the main loop, continue pre-setting the first long
|
||||
* word of each cache line ST_CHUNK lines in advance while
|
||||
* setting the other seven long words (56 bytes) of each
|
||||
* cache line until fewer than ST_CHUNK*64 bytes remain.
|
||||
* Then set the remaining seven long words of each cache
|
||||
* line that has already had its first long word set.
|
||||
* }
|
||||
* store remaining data in 64-byte chunks until less than
|
||||
* 64 bytes remain.
|
||||
* }
|
||||
* Store as many 8-byte chunks, followed by trailing bytes.
|
||||
*
|
||||
* BIS = Block Init Store
|
||||
* Doing the advance store of the first element of the cache line
|
||||
* initiates the displacement of a cache line while only using a single
|
||||
* instruction in the pipeline. That avoids various pipeline delays,
|
||||
* such as filling the miss buffer. The performance effect is
|
||||
* similar to prefetching for normal stores.
|
||||
* The special case for zero fills runs faster and uses fewer instruction
|
||||
* cycles than the normal memset loop.
|
||||
*
|
||||
* We only use BIS for memset of greater than MIN_LOOP bytes because a sequence
|
||||
* BIS stores must be followed by a membar #StoreStore. The benefit of
|
||||
* the BIS store must be balanced against the cost of the membar operation.
|
||||
*/
|
||||
|
||||
/*
|
||||
* ASI_STBI_P marks the cache line as "least recently used"
|
||||
* which means if many threads are active, it has a high chance
|
||||
* of being pushed out of the cache between the first initializing
|
||||
* store and the final stores.
|
||||
* Thus, we use ASI_STBIMRU_P which marks the cache line as
|
||||
* "most recently used" for all but the last store to the cache line.
|
||||
*/
|
||||
|
||||
#include <asm/asi.h>
|
||||
#include <asm/page.h>
|
||||
|
||||
#define ASI_STBI_P ASI_BLK_INIT_QUAD_LDD_P
|
||||
#define ASI_STBIMRU_P ASI_ST_BLKINIT_MRU_P
|
||||
|
||||
|
||||
#define ST_CHUNK 24 /* multiple of 4 due to loop unrolling */
|
||||
#define MIN_LOOP 16320
|
||||
#define MIN_ZERO 512
|
||||
|
||||
.section ".text"
|
||||
.align 32
|
||||
|
||||
/*
|
||||
* Define clear_page(dest) as memset(dest, 0, PAGE_SIZE)
|
||||
* (can create a more optimized version later.)
|
||||
*/
|
||||
.globl M7clear_page
|
||||
.globl M7clear_user_page
|
||||
M7clear_page: /* clear_page(dest) */
|
||||
M7clear_user_page:
|
||||
set PAGE_SIZE, %o1
|
||||
/* fall through into bzero code */
|
||||
|
||||
.size M7clear_page,.-M7clear_page
|
||||
.size M7clear_user_page,.-M7clear_user_page
|
||||
|
||||
/*
|
||||
* Define bzero(dest, n) as memset(dest, 0, n)
|
||||
* (can create a more optimized version later.)
|
||||
*/
|
||||
.globl M7bzero
|
||||
M7bzero: /* bzero(dest, size) */
|
||||
mov %o1, %o2
|
||||
mov 0, %o1
|
||||
/* fall through into memset code */
|
||||
|
||||
.size M7bzero,.-M7bzero
|
||||
|
||||
.global M7memset
|
||||
.type M7memset, #function
|
||||
.register %g3, #scratch
|
||||
M7memset:
|
||||
mov %o0, %o5 ! copy sp1 before using it
|
||||
cmp %o2, 7 ! if small counts, just write bytes
|
||||
bleu,pn %xcc, .wrchar
|
||||
and %o1, 0xff, %o1 ! o1 is (char)c
|
||||
|
||||
sll %o1, 8, %o3
|
||||
or %o1, %o3, %o1 ! now o1 has 2 bytes of c
|
||||
sll %o1, 16, %o3
|
||||
cmp %o2, 32
|
||||
blu,pn %xcc, .wdalign
|
||||
or %o1, %o3, %o1 ! now o1 has 4 bytes of c
|
||||
|
||||
sllx %o1, 32, %o3
|
||||
or %o1, %o3, %o1 ! now o1 has 8 bytes of c
|
||||
|
||||
.dbalign:
|
||||
andcc %o5, 7, %o3 ! is sp1 aligned on a 8 byte bound?
|
||||
bz,pt %xcc, .blkalign ! already long word aligned
|
||||
sub %o3, 8, %o3 ! -(bytes till long word aligned)
|
||||
|
||||
add %o2, %o3, %o2 ! update o2 with new count
|
||||
! Set -(%o3) bytes till sp1 long word aligned
|
||||
1: stb %o1, [%o5] ! there is at least 1 byte to set
|
||||
inccc %o3 ! byte clearing loop
|
||||
bl,pt %xcc, 1b
|
||||
inc %o5
|
||||
|
||||
! Now sp1 is long word aligned (sp1 is found in %o5)
|
||||
.blkalign:
|
||||
cmp %o2, 64 ! check if there are 64 bytes to set
|
||||
blu,pn %xcc, .wrshort
|
||||
mov %o2, %o3
|
||||
|
||||
andcc %o5, 63, %o3 ! is sp1 block aligned?
|
||||
bz,pt %xcc, .blkwr ! now block aligned
|
||||
sub %o3, 64, %o3 ! o3 is -(bytes till block aligned)
|
||||
add %o2, %o3, %o2 ! o2 is the remainder
|
||||
|
||||
! Store -(%o3) bytes till dst is block (64 byte) aligned.
|
||||
! Use long word stores.
|
||||
! Recall that dst is already long word aligned
|
||||
1:
|
||||
addcc %o3, 8, %o3
|
||||
stx %o1, [%o5]
|
||||
bl,pt %xcc, 1b
|
||||
add %o5, 8, %o5
|
||||
|
||||
! Now sp1 is block aligned
|
||||
.blkwr:
|
||||
andn %o2, 63, %o4 ! calculate size of blocks in bytes
|
||||
brz,pn %o1, .wrzero ! special case if c == 0
|
||||
and %o2, 63, %o3 ! %o3 = bytes left after blk stores.
|
||||
|
||||
set MIN_LOOP, %g1
|
||||
cmp %o4, %g1 ! check there are enough bytes to set
|
||||
blu,pn %xcc, .short_set ! to justify cost of membar
|
||||
! must be > pre-cleared lines
|
||||
nop
|
||||
|
||||
! initial cache-clearing stores
|
||||
! get store pipeline moving
|
||||
rd %asi, %g3 ! save %asi to be restored later
|
||||
wr %g0, ASI_STBIMRU_P, %asi
|
||||
|
||||
! Primary memset loop for large memsets
|
||||
.wr_loop:
|
||||
sub %o5, 8, %o5 ! adjust %o5 for ASI store alignment
|
||||
mov ST_CHUNK, %g1
|
||||
.wr_loop_start:
|
||||
stxa %o1, [%o5+8]%asi
|
||||
subcc %g1, 4, %g1
|
||||
stxa %o1, [%o5+8+64]%asi
|
||||
add %o5, 256, %o5
|
||||
stxa %o1, [%o5+8-128]%asi
|
||||
bgu %xcc, .wr_loop_start
|
||||
stxa %o1, [%o5+8-64]%asi
|
||||
|
||||
sub %o5, ST_CHUNK*64, %o5 ! reset %o5
|
||||
mov ST_CHUNK, %g1
|
||||
|
||||
.wr_loop_rest:
|
||||
stxa %o1, [%o5+8+8]%asi
|
||||
sub %o4, 64, %o4
|
||||
stxa %o1, [%o5+16+8]%asi
|
||||
subcc %g1, 1, %g1
|
||||
stxa %o1, [%o5+24+8]%asi
|
||||
stxa %o1, [%o5+32+8]%asi
|
||||
stxa %o1, [%o5+40+8]%asi
|
||||
add %o5, 64, %o5
|
||||
stxa %o1, [%o5-8]%asi
|
||||
bgu %xcc, .wr_loop_rest
|
||||
stxa %o1, [%o5]ASI_STBI_P
|
||||
|
||||
! If more than ST_CHUNK*64 bytes remain to set, continue
|
||||
! setting the first long word of each cache line in advance
|
||||
! to keep the store pipeline moving.
|
||||
|
||||
cmp %o4, ST_CHUNK*64
|
||||
bge,pt %xcc, .wr_loop_start
|
||||
mov ST_CHUNK, %g1
|
||||
|
||||
brz,a,pn %o4, .asi_done
|
||||
add %o5, 8, %o5 ! restore %o5 offset
|
||||
|
||||
.wr_loop_small:
|
||||
stxa %o1, [%o5+8]%asi
|
||||
stxa %o1, [%o5+8+8]%asi
|
||||
stxa %o1, [%o5+16+8]%asi
|
||||
stxa %o1, [%o5+24+8]%asi
|
||||
stxa %o1, [%o5+32+8]%asi
|
||||
subcc %o4, 64, %o4
|
||||
stxa %o1, [%o5+40+8]%asi
|
||||
add %o5, 64, %o5
|
||||
stxa %o1, [%o5-8]%asi
|
||||
bgu,pt %xcc, .wr_loop_small
|
||||
stxa %o1, [%o5]ASI_STBI_P
|
||||
|
||||
ba .asi_done
|
||||
add %o5, 8, %o5 ! restore %o5 offset
|
||||
|
||||
! Special case loop for zero fill memsets
|
||||
! For each 64 byte cache line, single STBI to first element
|
||||
! clears line
|
||||
.wrzero:
|
||||
cmp %o4, MIN_ZERO ! check if enough bytes to set
|
||||
! to pay %asi + membar cost
|
||||
blu %xcc, .short_set
|
||||
nop
|
||||
sub %o4, 256, %o4
|
||||
|
||||
.wrzero_loop:
|
||||
mov 64, %g3
|
||||
stxa %o1, [%o5]ASI_STBI_P
|
||||
subcc %o4, 256, %o4
|
||||
stxa %o1, [%o5+%g3]ASI_STBI_P
|
||||
add %o5, 256, %o5
|
||||
sub %g3, 192, %g3
|
||||
stxa %o1, [%o5+%g3]ASI_STBI_P
|
||||
add %g3, 64, %g3
|
||||
bge,pt %xcc, .wrzero_loop
|
||||
stxa %o1, [%o5+%g3]ASI_STBI_P
|
||||
add %o4, 256, %o4
|
||||
|
||||
brz,pn %o4, .bsi_done
|
||||
nop
|
||||
|
||||
.wrzero_small:
|
||||
stxa %o1, [%o5]ASI_STBI_P
|
||||
subcc %o4, 64, %o4
|
||||
bgu,pt %xcc, .wrzero_small
|
||||
add %o5, 64, %o5
|
||||
ba,a .bsi_done
|
||||
|
||||
.asi_done:
|
||||
wr %g3, 0x0, %asi ! restored saved %asi
|
||||
.bsi_done:
|
||||
membar #StoreStore ! required by use of Block Store Init
|
||||
|
||||
.short_set:
|
||||
cmp %o4, 64 ! check if 64 bytes to set
|
||||
blu %xcc, 5f
|
||||
nop
|
||||
4: ! set final blocks of 64 bytes
|
||||
stx %o1, [%o5]
|
||||
stx %o1, [%o5+8]
|
||||
stx %o1, [%o5+16]
|
||||
stx %o1, [%o5+24]
|
||||
subcc %o4, 64, %o4
|
||||
stx %o1, [%o5+32]
|
||||
stx %o1, [%o5+40]
|
||||
add %o5, 64, %o5
|
||||
stx %o1, [%o5-16]
|
||||
bgu,pt %xcc, 4b
|
||||
stx %o1, [%o5-8]
|
||||
|
||||
5:
|
||||
! Set the remaining long words
|
||||
.wrshort:
|
||||
subcc %o3, 8, %o3 ! Can we store any long words?
|
||||
blu,pn %xcc, .wrchars
|
||||
and %o2, 7, %o2 ! calc bytes left after long words
|
||||
6:
|
||||
subcc %o3, 8, %o3
|
||||
stx %o1, [%o5] ! store the long words
|
||||
bgeu,pt %xcc, 6b
|
||||
add %o5, 8, %o5
|
||||
|
||||
.wrchars: ! check for extra chars
|
||||
brnz %o2, .wrfin
|
||||
nop
|
||||
retl
|
||||
nop
|
||||
|
||||
.wdalign:
|
||||
andcc %o5, 3, %o3 ! is sp1 aligned on a word boundary
|
||||
bz,pn %xcc, .wrword
|
||||
andn %o2, 3, %o3 ! create word sized count in %o3
|
||||
|
||||
dec %o2 ! decrement count
|
||||
stb %o1, [%o5] ! clear a byte
|
||||
b .wdalign
|
||||
inc %o5 ! next byte
|
||||
|
||||
.wrword:
|
||||
subcc %o3, 4, %o3
|
||||
st %o1, [%o5] ! 4-byte writing loop
|
||||
bnz,pt %xcc, .wrword
|
||||
add %o5, 4, %o5
|
||||
|
||||
and %o2, 3, %o2 ! leftover count, if any
|
||||
|
||||
.wrchar:
|
||||
! Set the remaining bytes, if any
|
||||
brz %o2, .exit
|
||||
nop
|
||||
.wrfin:
|
||||
deccc %o2
|
||||
stb %o1, [%o5]
|
||||
bgu,pt %xcc, .wrfin
|
||||
inc %o5
|
||||
.exit:
|
||||
retl ! %o0 was preserved
|
||||
nop
|
||||
|
||||
.size M7memset,.-M7memset
|
||||
|
|
@ -0,0 +1,51 @@
|
|||
/*
|
||||
* M7patch.S: Patch generic routines with M7 variant.
|
||||
*
|
||||
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
|
||||
*/
|
||||
|
||||
#include <linux/linkage.h>
|
||||
|
||||
#define BRANCH_ALWAYS 0x10680000
|
||||
#define NOP 0x01000000
|
||||
#define NG_DO_PATCH(OLD, NEW) \
|
||||
sethi %hi(NEW), %g1; \
|
||||
or %g1, %lo(NEW), %g1; \
|
||||
sethi %hi(OLD), %g2; \
|
||||
or %g2, %lo(OLD), %g2; \
|
||||
sub %g1, %g2, %g1; \
|
||||
sethi %hi(BRANCH_ALWAYS), %g3; \
|
||||
sll %g1, 11, %g1; \
|
||||
srl %g1, 11 + 2, %g1; \
|
||||
or %g3, %lo(BRANCH_ALWAYS), %g3; \
|
||||
or %g3, %g1, %g3; \
|
||||
stw %g3, [%g2]; \
|
||||
sethi %hi(NOP), %g3; \
|
||||
or %g3, %lo(NOP), %g3; \
|
||||
stw %g3, [%g2 + 0x4]; \
|
||||
flush %g2;
|
||||
|
||||
ENTRY(m7_patch_copyops)
|
||||
NG_DO_PATCH(memcpy, M7memcpy)
|
||||
NG_DO_PATCH(raw_copy_from_user, M7copy_from_user)
|
||||
NG_DO_PATCH(raw_copy_to_user, M7copy_to_user)
|
||||
retl
|
||||
nop
|
||||
ENDPROC(m7_patch_copyops)
|
||||
|
||||
ENTRY(m7_patch_bzero)
|
||||
NG_DO_PATCH(memset, M7memset)
|
||||
NG_DO_PATCH(__bzero, M7bzero)
|
||||
NG_DO_PATCH(__clear_user, NGclear_user)
|
||||
NG_DO_PATCH(tsb_init, NGtsb_init)
|
||||
retl
|
||||
nop
|
||||
ENDPROC(m7_patch_bzero)
|
||||
|
||||
ENTRY(m7_patch_pageops)
|
||||
NG_DO_PATCH(copy_user_page, NG4copy_user_page)
|
||||
NG_DO_PATCH(_clear_page, M7clear_page)
|
||||
NG_DO_PATCH(clear_user_page, M7clear_user_page)
|
||||
retl
|
||||
nop
|
||||
ENDPROC(m7_patch_pageops)
|
||||
|
|
@ -38,6 +38,9 @@ lib-$(CONFIG_SPARC64) += NG4patch.o NG4copy_page.o NG4clear_page.o NG4memset.o
|
|||
|
||||
lib-$(CONFIG_SPARC64) += Memcpy_utils.o
|
||||
|
||||
lib-$(CONFIG_SPARC64) += M7memcpy.o M7copy_from_user.o M7copy_to_user.o
|
||||
lib-$(CONFIG_SPARC64) += M7patch.o M7memset.o
|
||||
|
||||
lib-$(CONFIG_SPARC64) += GENmemcpy.o GENcopy_from_user.o GENcopy_to_user.o
|
||||
lib-$(CONFIG_SPARC64) += GENpatch.o GENpage.o GENbzero.o
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue