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Set default rounding mode to FE_NEAREST again. Thanks to Matthias Bentrup for providing some explanations.

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This commit is contained in:
Thilo Schulz 2011-09-27 14:43:20 +00:00
parent ebec84c55d
commit 8a500d71da
6 changed files with 34 additions and 59 deletions
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29
code/asm/snapvector.c
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@ -33,31 +33,21 @@ static unsigned char ssemask[16] __attribute__((aligned(16))) =
"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\x00\x00"
};
static const unsigned int ssecw __attribute__((aligned(16))) = 0x00001F80;
static const unsigned short fpucw = 0x037F;
void qsnapvectorsse(vec3_t vec)
{
uint32_t oldcw __attribute__((aligned(16)));
__asm__ volatile
(
"stmxcsr %3\n"
"ldmxcsr %1\n"
"movaps (%0), %%xmm1\n"
"movups (%2), %%xmm0\n"
"movups (%1), %%xmm0\n"
"movaps %%xmm0, %%xmm2\n"
"andps %%xmm1, %%xmm0\n"
"andnps %%xmm2, %%xmm1\n"
"cvtps2dq %%xmm0, %%xmm0\n"
"cvtdq2ps %%xmm0, %%xmm0\n"
"orps %%xmm1, %%xmm0\n"
"movups %%xmm0, (%2)\n"
"ldmxcsr %3\n"
"movups %%xmm0, (%1)\n"
:
: "r" (ssemask), "m" (ssecw), "r" (vec), "m" (oldcw)
: "r" (ssemask), "r" (vec)
: "memory", "%xmm0", "%xmm1", "%xmm2"
);
@ -73,16 +63,11 @@ void qsnapvectorx87(vec3_t vec)
{
__asm__ volatile
(
"sub $2, " ESP "\n"
"fnstcw (" ESP ")\n"
"fldcw %0\n"
QROUNDX87("(%1)")
QROUNDX87("4(%1)")
QROUNDX87("8(%1)")
"fldcw (" ESP ")\n"
"add $2, " ESP "\n"
QROUNDX87("(%0)")
QROUNDX87("4(%0)")
QROUNDX87("8(%0)")
:
: "m" (fpucw), "r" (vec)
: "r" (vec)
: "memory"
);
}