armemu: Fix FSUBS bug where NaN shouldn't be negated

2014-12-16 05:53:19 -05:00
parent 0fd731ee63
commit 2ed03c10e0
1 changed files with 4 additions and 1 deletions
--- a/src/core/arm/skyeye_common/vfp/vfpsingle.cpp
+++ b/src/core/arm/skyeye_common/vfp/vfpsingle.cpp
@@ -1148,7 +1148,10 @@ static u32 vfp_single_fsub(ARMul_State* state, int sd, int sn, s32 m, u32 fpscr)
    /*
     * Subtraction is addition with one sign inverted.
     */
-    return vfp_single_fadd(state, sd, sn, vfp_single_packed_negate(m), fpscr);
+    if (m != 0x7FC00000) // Only negate if m isn't NaN.
+        m = vfp_single_packed_negate(m);
+
+    return vfp_single_fadd(state, sd, sn, m, fpscr);
 }

 /*