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smulh: Fixed mul with 0 acting like it had a negative result.

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riperiperi 2018-06-06 23:43:09 +01:00
commit 560001e02b
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ChocolArm64/Instruction/ASoftFallback.cs
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@ -158,7 +158,7 @@ namespace ChocolArm64.Instruction
long Result = (long)UMulHi128((ulong)(LSign ? -LHS : LHS), (ulong)(RSign ? -RHS : RHS)); long Result = (long)UMulHi128((ulong)(LSign ? -LHS : LHS), (ulong)(RSign ? -RHS : RHS));
if (LSign != RSign) if (LSign != RSign && LHS != 0 && RHS != 0)
return (-Result) - 1; //for negative results, hi 64-bits start at 0xFFF... and count back return (-Result) - 1; //for negative results, hi 64-bits start at 0xFFF... and count back
return Result; return Result;
} }