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MIPS: math-emu: Add IEEE Std 754-2008 ABS.fmt and NEG.fmt emulation 

Implement IEEE Std 754-2008 non-arithmetic ABS.fmt and NEG.fmt emulation
wired to the state of the FCSR.ABS2008 bit.  In the non-arithmetic mode
the sign bit is altered according to the operation requested regardless
of the datum encoded in the input operand, no other bits are changed,
the resulting bit pattern is written to the output operand and no
exception is ever signalled.

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Fortune <Matthew.Fortune@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11476/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
steinar/wifi_calib_4_9_kernel
Maciej W. Rozycki 2015-11-13 00:47:08 +00:00 committed by Ralf Baechle
parent 9519ef37a4
commit 198f70589e
2 changed files with 50 additions and 26 deletions
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38
arch/mips/math-emu/dp_simple.c
View File

@ -23,27 +23,39 @@
union ieee754dp ieee754dp_neg(union ieee754dp x)
{
unsigned int oldrm;
union ieee754dp y;
oldrm = ieee754_csr.rm;
ieee754_csr.rm = FPU_CSR_RD;
y = ieee754dp_sub(ieee754dp_zero(0), x);
ieee754_csr.rm = oldrm;
if (ieee754_csr.abs2008) {
y = x;
DPSIGN(y) = !DPSIGN(x);
} else {
unsigned int oldrm;
oldrm = ieee754_csr.rm;
ieee754_csr.rm = FPU_CSR_RD;
y = ieee754dp_sub(ieee754dp_zero(0), x);
ieee754_csr.rm = oldrm;
}
return y;
}
union ieee754dp ieee754dp_abs(union ieee754dp x)
{
unsigned int oldrm;
union ieee754dp y;
oldrm = ieee754_csr.rm;
ieee754_csr.rm = FPU_CSR_RD;
if (DPSIGN(x))
y = ieee754dp_sub(ieee754dp_zero(0), x);
else
y = ieee754dp_add(ieee754dp_zero(0), x);
ieee754_csr.rm = oldrm;
if (ieee754_csr.abs2008) {
y = x;
DPSIGN(y) = 0;
} else {
unsigned int oldrm;
oldrm = ieee754_csr.rm;
ieee754_csr.rm = FPU_CSR_RD;
if (DPSIGN(x))
y = ieee754dp_sub(ieee754dp_zero(0), x);
else
y = ieee754dp_add(ieee754dp_zero(0), x);
ieee754_csr.rm = oldrm;
}
return y;
}

38
arch/mips/math-emu/sp_simple.c
View File

@ -23,27 +23,39 @@
union ieee754sp ieee754sp_neg(union ieee754sp x)
{
unsigned int oldrm;
union ieee754sp y;
oldrm = ieee754_csr.rm;
ieee754_csr.rm = FPU_CSR_RD;
y = ieee754sp_sub(ieee754sp_zero(0), x);
ieee754_csr.rm = oldrm;
if (ieee754_csr.abs2008) {
y = x;
SPSIGN(y) = !SPSIGN(x);
} else {
unsigned int oldrm;
oldrm = ieee754_csr.rm;
ieee754_csr.rm = FPU_CSR_RD;
y = ieee754sp_sub(ieee754sp_zero(0), x);
ieee754_csr.rm = oldrm;
}
return y;
}
union ieee754sp ieee754sp_abs(union ieee754sp x)
{
unsigned int oldrm;
union ieee754sp y;
oldrm = ieee754_csr.rm;
ieee754_csr.rm = FPU_CSR_RD;
if (SPSIGN(x))
y = ieee754sp_sub(ieee754sp_zero(0), x);
else
y = ieee754sp_add(ieee754sp_zero(0), x);
ieee754_csr.rm = oldrm;
if (ieee754_csr.abs2008) {
y = x;
SPSIGN(y) = 0;
} else {
unsigned int oldrm;
oldrm = ieee754_csr.rm;
ieee754_csr.rm = FPU_CSR_RD;
if (SPSIGN(x))
y = ieee754sp_sub(ieee754sp_zero(0), x);
else
y = ieee754sp_add(ieee754sp_zero(0), x);
ieee754_csr.rm = oldrm;
}
return y;
}