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Rework signed multiplication. Fixed an edge case and passes all tests. (#174)
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@ -153,13 +153,9 @@ namespace ChocolArm64.Instruction
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public static long SMulHi128(long LHS, long RHS)
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{
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bool LSign = (LHS < 0);
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bool RSign = (RHS < 0);
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long Result = (long)UMulHi128((ulong)(LSign ? -LHS : LHS), (ulong)(RSign ? -RHS : RHS));
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if (LSign != RSign && LHS != 0 && RHS != 0)
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return ~Result; //for negative results, hi 64-bits start at 0xFFF... and count back
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long Result = (long)UMulHi128((ulong)(LHS), (ulong)(RHS));
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if (LHS < 0) Result -= RHS;
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if (RHS < 0) Result -= LHS;
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return Result;
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}
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