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VFP: Fixed the VCVT behavior when converting from unsigned 32-bit values. (#51)

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Use a 64-bit register to hold the values so that we don't end up interpreting them as signed values.
This commit is contained in:
Sebastian Valle 2016-11-27 18:25:50 -05:00 committed by Merry
parent 0ff8c375af
commit 14eb70d7e4
1 changed files with 6 additions and 4 deletions
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10
src/backend_x64/emit_x64.cpp
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@ -2009,9 +2009,10 @@ void EmitX64::EmitFPU32ToSingle(IR::Block& block, IR::Inst* inst) {
Xbyak::Xmm from = reg_alloc.UseXmm(a);
Xbyak::Xmm to = reg_alloc.DefXmm(inst);
Xbyak::Reg32 gpr_scratch = reg_alloc.ScratchGpr().cvt32();
// Use a 64-bit register to ensure we don't end up treating the input as signed
Xbyak::Reg64 gpr_scratch = reg_alloc.ScratchGpr();
code->movd(gpr_scratch, from);
code->movq(gpr_scratch, from);
code->cvtsi2ss(to, gpr_scratch);
}
@ -2035,9 +2036,10 @@ void EmitX64::EmitFPU32ToDouble(IR::Block& block, IR::Inst* inst) {
Xbyak::Xmm from = reg_alloc.UseXmm(a);
Xbyak::Xmm to = reg_alloc.DefXmm(inst);
Xbyak::Reg32 gpr_scratch = reg_alloc.ScratchGpr().cvt32();
// Use a 64-bit register to ensure we don't end up treating the input as signed
Xbyak::Reg64 gpr_scratch = reg_alloc.ScratchGpr();
code->movd(gpr_scratch, from);
code->movq(gpr_scratch, from);
code->cvtsi2sd(to, gpr_scratch);
}