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JitIL: fix carry computation for srawi. 

The carry computation needs to be based on the input value, not the output
of the shift.
This commit is contained in:
magumagu 2014-04-13 20:25:56 -07:00
parent f034983b62
commit 1a4156a4a0
1 changed files with 7 additions and 5 deletions
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12
Source/Core/Core/PowerPC/JitILCommon/JitILBase_Integer.cpp
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@ -503,16 +503,18 @@ void JitILBase::srawix(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITIntegerOff)
IREmitter::InstLoc val = ibuild.EmitLoadGReg(inst.RS), test;
val = ibuild.EmitSarl(val, ibuild.EmitIntConst(inst.SH));
ibuild.EmitStoreGReg(val, inst.RA);
// Shift right by two
IREmitter::InstLoc input = ibuild.EmitLoadGReg(inst.RS);
IREmitter::InstLoc output = ibuild.EmitSarl(input, ibuild.EmitIntConst(inst.SH));
ibuild.EmitStoreGReg(output, inst.RA);
// Check whether the input is negative and any bits got shifted out.
unsigned int mask = -1u << inst.SH;
test = ibuild.EmitOr(val, ibuild.EmitIntConst(mask & 0x7FFFFFFF));
IREmitter::InstLoc test = ibuild.EmitOr(input, ibuild.EmitIntConst(mask & 0x7FFFFFFF));
test = ibuild.EmitICmpUgt(test, ibuild.EmitIntConst(mask));
ibuild.EmitStoreCarry(test);
if (inst.Rc)
ComputeRC(ibuild, val);
ComputeRC(ibuild, output);
}
// count leading zeroes