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FCOM/FUCOM now use inline assembler on x86 targets. Unreal now works.

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This commit is contained in:
TomW 2015-01-17 22:06:32 +00:00
commit 19c318675a
2 changed files with 77 additions and 16 deletions
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68
src/x87_ops.h
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@ -164,6 +164,74 @@ static inline void x87_stmmx(MMX_REG r)
writememw(easeg, eaaddr + 8, 0xffff);
}
static inline uint16_t x87_compare(double a, double b)
{
#if defined i386 || defined __i386 || defined __i386__ || defined _X86_ || defined WIN32 || defined _WIN32 || defined _WIN32
uint32_t out;
/* Memory barrier, to force GCC to write to the input parameters
* before the compare rather than after */
asm volatile ("" : : : "memory");
asm(
"fldl %2\n"
"fldl %1\n"
"fclex\n"
"fcompp\n"
"fnstsw %0\n"
: "=m" (out)
: "m" (a), "m" (b)
);
return out & (C0|C2|C3);
#else
/* Generic C version is known to give incorrect results in some
* situations, eg comparison of infinity (Unreal) */
uint32_t out = 0;
if (a == b)
out |= C3;
else if (a < b)
out |= C0;
return out;
#endif
}
static inline uint16_t x87_ucompare(double a, double b)
{
#if defined i386 || defined __i386 || defined __i386__ || defined _X86_ || defined WIN32 || defined _WIN32 || defined _WIN32
uint32_t out;
/* Memory barrier, to force GCC to write to the input parameters
* before the compare rather than after */
asm volatile ("" : : : "memory");
asm(
"fldl %2\n"
"fldl %1\n"
"fclex\n"
"fucompp\n"
"fnstsw %0\n"
: "=m" (out)
: "m" (a), "m" (b)
);
return out & (C0|C2|C3);
#else
/* Generic C version is known to give incorrect results in some
* situations, eg comparison of infinity (Unreal) */
uint32_t out = 0;
if (a == b)
out |= C3;
else if (a < b)
out |= C0;
return out;
#endif
}
typedef union
{
float s;