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x86-specific FADD (SSE2 version)

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This commit is contained in:
Cacodemon345
2025-06-30 02:08:48 +06:00
parent 96734590ca
commit b44042ef1c
2 changed files with 28 additions and 34 deletions
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38
src/cpu/x87_ops_arith.h
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@@ -2,33 +2,23 @@
#ifdef X87_INLINE_ASM
static inline double float_add(double src, double val, int round)
{
int orig_round, new_round;
__asm volatile(""
:
:
: "memory");
asm (
"fnstcw %0\n" : "=m"(orig_round)
);
new_round = orig_round & ~(3 << 10);
new_round |= (round << 10);
int rounding_mode_orig;
__asm volatile(""
:
:
: "memory");
__m128d xmm_src = _mm_load_sd(&src);
__m128d xmm_dst = _mm_load_sd(&val);
__m128d xmm_res;
asm (
"fldl %0\n"
"fldcw %1\n"
"faddl %2\n"
"fstl %0\n"
"fldcw %3\n"
: "=m"(src)
: "m"(new_round), "m"(val), "m"(orig_round)
);
rounding_mode_orig = _MM_GET_ROUNDING_MODE();
if (round == 0) _MM_SET_ROUNDING_MODE(_MM_ROUND_NEAREST);
if (round == 1) _MM_SET_ROUNDING_MODE(_MM_ROUND_DOWN);
if (round == 2) _MM_SET_ROUNDING_MODE(_MM_ROUND_UP);
if (round == 3) _MM_SET_ROUNDING_MODE(_MM_ROUND_TOWARD_ZERO);
return src;
xmm_res = _mm_add_sd(xmm_src, xmm_dst);
_MM_SET_ROUNDING_MODE(rounding_mode_orig);
return _mm_cvtsd_f64(xmm_res);
}
#define DO_FADD(use_var) \