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FPU: some fixes about NaN, SNaN, QNan in related opcodes, according to the CPU manual. Ector, please double check. I don't see any side effects yet.

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4288 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
rice1964 2009-09-17 04:05:14 +00:00
parent 4edf1ea837
commit 7f2d4fc2c8
2 changed files with 67 additions and 46 deletions
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35
Source/Core/Core/Src/PowerPC/Interpreter/Interpreter_FloatingPoint.cpp
View File

@ -59,33 +59,18 @@ void fcmpo(UGeckoInstruction _inst)
double fb = rPS0(_inst.FB);
int compareResult;
//if (IsNAN(fa) || IsNAN(fb))
//{
// FPSCR.FX = 1;
// compareResult = 1;
// if (IsSNAN(fa) || IsSNAN(fb))
// {
// FPSCR.VXSNAN = 1;
// if (!FPSCR.FEX || IsQNAN(fa) || IsQNAN(fb))
// FPSCR.VXVC = 1;
// }
//}
//else
if (fa < fb) compareResult = 8;
else if (fa > fb) compareResult = 4;
else if (fa == fb) compareResult = 2;
else
{
// either fa or fb is NaN, or both,
FPSCR.FX = 1;
compareResult = 1;
if (IsSNAN(fa) || IsSNAN(fb))
{
if (IsSNAN(fa) || IsSNAN(fb))
FPSCR.VXSNAN = 1;
if (!FPSCR.FEX || IsQNAN(fa) || IsQNAN(fb))
FPSCR.VXVC = 1;
}
if (!FPSCR.FEX || IsQNAN(fa) || IsQNAN(fb))
FPSCR.VXVC = 1;
}
FPSCR.FPRF = compareResult;
@ -100,22 +85,12 @@ void fcmpu(UGeckoInstruction _inst)
double fb = rPS0(_inst.FB);
int compareResult;
//if (IsNAN(fa) || IsNAN(fb))
//{
// FPSCR.FX = 1;
// compareResult = 1;
// if (IsSNAN(fa) || IsSNAN(fb))
// {
// FPSCR.VXSNAN = 1;
// }
//}
//else
if (fa < fb) compareResult = 8;
else if (fa > fb) compareResult = 4;
else if (fa == fb) compareResult = 2;
else
{
// either fa or fb is NaN, or both
FPSCR.FX = 1;
compareResult = 1;
if (IsSNAN(fa) || IsSNAN(fb))

78
Source/Core/Core/Src/PowerPC/Interpreter/Interpreter_Paired.cpp
View File

@ -29,12 +29,6 @@ namespace Interpreter
// These "binary instructions" do not alter FPSCR.
void ps_sel(UGeckoInstruction _inst)
{
//rPS0(_inst.FD) = !IsNAN(rPS0(_inst.FA)) && rPS0(_inst.FA) >= -0.0 ?
// rPS0(_inst.FC) : rPS0(_inst.FB);
//rPS1(_inst.FD) = !IsNAN(rPS1(_inst.FA)) && rPS1(_inst.FA) >= -0.0 ?
// rPS1(_inst.FC) : rPS1(_inst.FB);
// no need to check isNaN
rPS0(_inst.FD) = rPS0(_inst.FA) >= -0.0 ? rPS0(_inst.FC) : rPS0(_inst.FB);
rPS1(_inst.FD) = rPS1(_inst.FA) >= -0.0 ? rPS1(_inst.FC) : rPS1(_inst.FB);
if (_inst.Rc) Helper_UpdateCR1(rPS0(_inst.FD));
@ -247,20 +241,46 @@ void ps_cmpu0(UGeckoInstruction _inst)
double fa = rPS0(_inst.FA);
double fb = rPS0(_inst.FB);
int compareResult;
//if (IsNAN(fa) || IsNAN(fb)) compareResult = 1;
//else
if (fa < fb) compareResult = 8;
else if (fa > fb) compareResult = 4;
else if (fa == fb) compareResult = 2;
else compareResult = 1;
else
{
compareResult = 1;
if (IsSNAN(fa) || IsSNAN(fb))
{
FPSCR.VXSNAN = 1;
}
}
SetCRField(_inst.CRFD, compareResult);
if (_inst.Rc) Helper_UpdateCR1(rPS0(_inst.FD));
}
void ps_cmpo0(UGeckoInstruction _inst)
{
// for now HACK
ps_cmpu0(_inst);
// Ector, please check
//ps_cmpu0(_inst);
double fa = rPS0(_inst.FA);
double fb = rPS0(_inst.FB);
int compareResult;
if (fa < fb) compareResult = 8;
else if (fa > fb) compareResult = 4;
else if (fa == fb) compareResult = 2;
else
{
compareResult = 1;
if (IsSNAN(fa) || IsSNAN(fb))
{
FPSCR.VXSNAN = 1;
if (!FPSCR.FEX) FPSCR.VXVC = 1;
}
else if (IsQNAN(fa) || IsQNAN(fb))
FPSCR.VXVC = 1;
}
SetCRField(_inst.CRFD, compareResult);
if (_inst.Rc) Helper_UpdateCR1(rPS0(_inst.FD));
}
void ps_cmpu1(UGeckoInstruction _inst)
@ -268,20 +288,46 @@ void ps_cmpu1(UGeckoInstruction _inst)
double fa = rPS1(_inst.FA);
double fb = rPS1(_inst.FB);
int compareResult;
//if (IsNAN(fa) || IsNAN(fb)) compareResult = 1;
//else
if (fa < fb) compareResult = 8;
else if (fa > fb) compareResult = 4;
else if (fa == fb) compareResult = 2;
else compareResult = 1;
else
{
compareResult = 1;
if (IsSNAN(fa) || IsSNAN(fb))
{
FPSCR.VXSNAN = 1;
}
}
SetCRField(_inst.CRFD, compareResult);
if (_inst.Rc) Helper_UpdateCR1(rPS0(_inst.FD));
}
void ps_cmpo1(UGeckoInstruction _inst)
{
// for now HACK
ps_cmpu1(_inst);
// Ector, please check
//ps_cmpu1(_inst);
double fa = rPS1(_inst.FA);
double fb = rPS1(_inst.FB);
int compareResult;
if (fa < fb) compareResult = 8;
else if (fa > fb) compareResult = 4;
else if (fa == fb) compareResult = 2;
else
{
compareResult = 1;
if (IsSNAN(fa) || IsSNAN(fb))
{
FPSCR.VXSNAN = 1;
if (!FPSCR.FEX) FPSCR.VXVC = 1;
}
else if (IsQNAN(fa) || IsQNAN(fb))
FPSCR.VXVC = 1;
}
SetCRField(_inst.CRFD, compareResult);
if (_inst.Rc) Helper_UpdateCR1(rPS0(_inst.FD));
}
// __________________________________________________________________________________________________