Merge pull request #9845 from Sintendo/jit64mtfsfx

Jit64: mtfsfx - Optimized masking
dolphin-emu · Jun 26, 2021 · 52fb2fa · 52fb2fa
2 parents c77a5f7 + 7de4623
commit 52fb2fa
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/Source/Core/Core/PowerPC/Jit64/Jit_SystemRegisters.cpp b/Source/Core/Core/PowerPC/Jit64/Jit_SystemRegisters.cpp
@@ -792,10 +792,13 @@ void Jit64::mtfsfx(UGeckoInstruction inst)
   else
     MOV(32, R(RSCRATCH), Rb);
 
-  MOV(32, R(RSCRATCH2), PPCSTATE(fpscr));
-  AND(32, R(RSCRATCH), Imm32(mask));
-  AND(32, R(RSCRATCH2), Imm32(~mask));
-  OR(32, R(RSCRATCH), R(RSCRATCH2));
+  if (mask != 0xFFFFFFFF)
+  {
+    MOV(32, R(RSCRATCH2), PPCSTATE(fpscr));
+    AND(32, R(RSCRATCH), Imm32(mask));
+    AND(32, R(RSCRATCH2), Imm32(~mask));
+    OR(32, R(RSCRATCH), R(RSCRATCH2));
+  }
   MOV(32, PPCSTATE(fpscr), R(RSCRATCH));
 
   if (inst.FM & 1)