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x86jit: Implement other rounding modes in vf2i.

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3% improvement in Grand Knights History.  I know other games use these
too.
This commit is contained in:
Unknown W. Brackets 2014-11-03 23:22:08 -08:00
parent d7bdded6f8
commit 3e95763a3f
1 changed files with 28 additions and 6 deletions
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34
Core/MIPS/x86/CompVFPU.cpp
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@ -1331,6 +1331,8 @@ static const float half = 0.5f;
static double maxIntAsDouble = (double)0x7fffffff; // that's not equal to 0x80000000
static double minIntAsDouble = (double)(int)0x80000000;
static u32 mxcsrTemp;
void Jit::Comp_Vf2i(MIPSOpcode op) {
CONDITIONAL_DISABLE;
if (js.HasUnknownPrefix())
@ -1342,15 +1344,30 @@ void Jit::Comp_Vf2i(MIPSOpcode op) {
int imm = (op >> 16) & 0x1f;
const double *mult = &mulTableVf2i[imm];
int setMXCSR = -1;
switch ((op >> 21) & 0x1f)
{
case 17:
break; //z - truncate. Easy to support.
case 16:
case 18:
case 19:
DISABLE;
setMXCSR = 0;
break;
case 18:
setMXCSR = 2;
break;
case 19:
setMXCSR = 1;
break;
}
// Except for truncate, we need to update MXCSR to our preferred rounding mode.
if (setMXCSR != -1) {
STMXCSR(M(&mxcsrTemp));
MOV(32, R(EAX), M(&mxcsrTemp));
AND(32, R(EAX), Imm32(~(3 << 13)));
OR(32, R(EAX), Imm32(setMXCSR << 13));
MOV(32, M(&mips_->temp), R(EAX));
LDMXCSR(M(&mips_->temp));
}
u8 sregs[4], dregs[4];
@ -1380,11 +1397,12 @@ void Jit::Comp_Vf2i(MIPSOpcode op) {
}
MINSD(XMM0, M(&maxIntAsDouble));
MAXSD(XMM0, M(&minIntAsDouble));
// We've set the rounding mode above, so this part's easy.
switch ((op >> 21) & 0x1f) {
case 16: /* TODO */ break; //n
case 16: CVTSD2SI(EAX, R(XMM0)); break; //n
case 17: CVTTSD2SI(EAX, R(XMM0)); break; //z - truncate
case 18: /* TODO */ break; //u
case 19: /* TODO */ break; //d
case 18: CVTSD2SI(EAX, R(XMM0)); break; //u
case 19: CVTSD2SI(EAX, R(XMM0)); break; //d
}
MOVD_xmm(fpr.VX(tempregs[i]), R(EAX));
}
@ -1396,6 +1414,10 @@ void Jit::Comp_Vf2i(MIPSOpcode op) {
}
}
if (setMXCSR != -1) {
LDMXCSR(M(&mxcsrTemp));
}
ApplyPrefixD(dregs, sz);
fpr.ReleaseSpillLocks();
}