From 0b837f1ef8822a8df880ffba6778ba42f707b83d Mon Sep 17 00:00:00 2001 From: Uros Bizjak Date: Fri, 27 Nov 2020 10:59:43 +0100 Subject: [PATCH] crypto: x86/sha512 - Use TEST %reg,%reg instead of CMP $0,%reg CMP $0,%reg can't set overflow flag, so we can use shorter TEST %reg,%reg instruction when only zero and sign flags are checked (E,L,LE,G,GE conditions). Signed-off-by: Uros Bizjak Cc: Herbert Xu Cc: Borislav Petkov Cc: "H. Peter Anvin" Signed-off-by: Herbert Xu --- arch/x86/crypto/sha512-avx-asm.S | 2 +- arch/x86/crypto/sha512-ssse3-asm.S | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/crypto/sha512-avx-asm.S b/arch/x86/crypto/sha512-avx-asm.S index 63470fd6ae32..684d58c8bc4f 100644 --- a/arch/x86/crypto/sha512-avx-asm.S +++ b/arch/x86/crypto/sha512-avx-asm.S @@ -278,7 +278,7 @@ frame_size = frame_GPRSAVE + GPRSAVE_SIZE # "blocks" is the message length in SHA512 blocks ######################################################################## SYM_FUNC_START(sha512_transform_avx) - cmp $0, msglen + test msglen, msglen je nowork # Allocate Stack Space diff --git a/arch/x86/crypto/sha512-ssse3-asm.S b/arch/x86/crypto/sha512-ssse3-asm.S index 7946a1bee85b..50812af0b083 100644 --- a/arch/x86/crypto/sha512-ssse3-asm.S +++ b/arch/x86/crypto/sha512-ssse3-asm.S @@ -280,7 +280,7 @@ frame_size = frame_GPRSAVE + GPRSAVE_SIZE ######################################################################## SYM_FUNC_START(sha512_transform_ssse3) - cmp $0, msglen + test msglen, msglen je nowork # Allocate Stack Space