Interpreter_FloatingPoint: Set FPSCR.VXSNAN if input to fres is a signaling NaN

fres is defined as having the VXSNAN bit set if an input to the
instruction is a signaling NaN

1 files changed, 6 insertions, 1 deletions

diff --git a/Source/Core/Core/PowerPC/Interpreter/Interpreter_FloatingPoint.cpp b/Source/Core/Core/PowerPC/Interpreter/Interpreter_FloatingPoint.cpp
index 98a5b8a2c0..18a33a1a5e 100644
--- a/Source/Core/Core/PowerPC/Interpreter/Interpreter_FloatingPoint.cpp
+++ b/Source/Core/Core/PowerPC/Interpreter/Interpreter_FloatingPoint.cpp
@@ -394,7 +394,7 @@ void Interpreter::fdivsx(UGeckoInstruction inst)
 // Single precision only.
 void Interpreter::fresx(UGeckoInstruction inst)
 {
-  double b = rPS0(inst.FB);
+  const double b = rPS0(inst.FB);
   rPS0(inst.FD) = rPS1(inst.FD) = Common::ApproximateReciprocal(b);
 
   if (b == 0.0)
@@ -402,6 +402,11 @@ void Interpreter::fresx(UGeckoInstruction inst)
     SetFPException(FPSCR_ZX);
   }
 
+  if (Common::IsSNAN(b))
+  {
+    SetFPException(FPSCR_VXSNAN);
+  }
+
   PowerPC::UpdateFPRF(rPS0(inst.FD));
 
   if (inst.Rc)