Mirrors/Ryujinx
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

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

Browse source
This commit is contained in:
riperiperi 2018-06-20 14:45:20 +01:00 committed by gdkchan
parent 3bdd109f45
commit 53ebbcfbd9
1 changed files with 3 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
ChocolArm64/Instruction/ASoftFallback.cs
View file

@ -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;
}