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Interpreter_FPUtils: Set FPSCR.VXSNAN if any operand to NI_msub is a signaling NaN

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If any operand is a signaling NaN, we need to signify this by setting
the VXSNAN bit.

Fixes NaN flag setting for fmsub, fmsubs, fnmsub, fnmsubs, ps_msub, and
ps_nmsub instructions.
This commit is contained in:
Lioncash 2018-05-27 16:24:22 -04:00
parent 3ebd713c33
commit a4cc854351
1 changed files with 11 additions and 0 deletions
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11
Source/Core/Core/PowerPC/Interpreter/Interpreter_FPUtils.h
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@ -227,26 +227,37 @@ inline double NI_madd(double a, double c, double b)
inline double NI_msub(double a, double c, double b)
{
double t = a * c;
if (std::isnan(t))
{
if (Common::IsSNAN(a) || Common::IsSNAN(b) || Common::IsSNAN(c))
SetFPException(FPSCR_VXSNAN);
if (std::isnan(a))
return MakeQuiet(a);
if (std::isnan(b))
return MakeQuiet(b); // !
if (std::isnan(c))
return MakeQuiet(c);
SetFPException(FPSCR_VXIMZ);
return PPC_NAN;
}
t -= b;
if (std::isnan(t))
{
if (Common::IsSNAN(b))
SetFPException(FPSCR_VXSNAN);
if (std::isnan(b))
return MakeQuiet(b);
SetFPException(FPSCR_VXISI);
return PPC_NAN;
}
return t;
}