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Interpreter_FPUtils: Set FPSCR.VXSNAN if either operand to NI_sub is a signaling NaN

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

This fixes NaN flag setting for fsub, fsubs, and ps_sub instructions.
This commit is contained in:
Lioncash 2018-05-27 16:08:23 -04:00
parent f4c5ceba1c
commit b18dd442f7
1 changed files with 7 additions and 1 deletions
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8
Source/Core/Core/PowerPC/Interpreter/Interpreter_FPUtils.h
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@ -165,16 +165,22 @@ inline double NI_add(double a, double b)
inline double NI_sub(double a, double b) inline double NI_sub(double a, double b)
{ {
double t = a - b; const double t = a - b;
if (std::isnan(t)) if (std::isnan(t))
{ {
if (Common::IsSNAN(a) || Common::IsSNAN(b))
SetFPException(FPSCR_VXSNAN);
if (std::isnan(a)) if (std::isnan(a))
return MakeQuiet(a); return MakeQuiet(a);
if (std::isnan(b)) if (std::isnan(b))
return MakeQuiet(b); return MakeQuiet(b);
SetFPException(FPSCR_VXISI); SetFPException(FPSCR_VXISI);
return PPC_NAN; return PPC_NAN;
} }
return t; return t;
} }