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Rework signed multiplication. Fixed an edge case and passes all tests. (#174)

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riperiperi 2018-06-20 14:45:20 +01:00 committed by gdkchan
parent 7084bf58a4
commit 32900cc223
1 changed files with 3 additions and 7 deletions
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10
Instruction/ASoftFallback.cs
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@ -153,13 +153,9 @@ namespace ChocolArm64.Instruction
public static long SMulHi128(long LHS, long RHS)
{
bool LSign = (LHS < 0);
bool RSign = (RHS < 0);
long Result = (long)UMulHi128((ulong)(LSign ? -LHS : LHS), (ulong)(RSign ? -RHS : RHS));
if (LSign != RSign && LHS != 0 && RHS != 0)
return ~Result; //for negative results, hi 64-bits start at 0xFFF... and count back
long Result = (long)UMulHi128((ulong)(LHS), (ulong)(RHS));
if (LHS < 0) Result -= RHS;
if (RHS < 0) Result -= LHS;
return Result;
}