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emit_x64_floating_point: Correct use of UseGpr() in EmitFPU32ToDouble() and EmitFPU32ToSingle()

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In the non-AVX512 path, the following code is present:

code.mov(from.cvt32(), from.cvt32());

since this potentially modifies 'from', we should be using
UseScratchGpr() instead.
This commit is contained in:
Lioncash 2018-07-09 18:32:36 -04:00 committed by MerryMage
parent fbd7623fe5
commit 7252293184
1 changed files with 4 additions and 2 deletions
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6
src/backend_x64/emit_x64_floating_point.cpp
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@ -1032,15 +1032,16 @@ void EmitX64::EmitFPS32ToSingle(EmitContext& ctx, IR::Inst* inst) {
void EmitX64::EmitFPU32ToSingle(EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Reg64 from = ctx.reg_alloc.UseGpr(args[0]);
const Xbyak::Xmm to = ctx.reg_alloc.ScratchXmm();
const bool round_to_nearest = args[1].GetImmediateU1();
ASSERT_MSG(!round_to_nearest, "round_to_nearest unimplemented");
if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX512F)) {
const Xbyak::Reg64 from = ctx.reg_alloc.UseGpr(args[0]);
code.vcvtusi2ss(to, to, from.cvt32());
} else {
// We are using a 64-bit GPR register to ensure we don't end up treating the input as signed
const Xbyak::Reg64 from = ctx.reg_alloc.UseScratchGpr(args[0]);
code.mov(from.cvt32(), from.cvt32()); // TODO: Verify if this is necessary
code.cvtsi2ss(to, from);
}
@ -1076,15 +1077,16 @@ void EmitX64::EmitFPS64ToDouble(EmitContext& ctx, IR::Inst* inst) {
void EmitX64::EmitFPU32ToDouble(EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Reg64 from = ctx.reg_alloc.UseGpr(args[0]);
const Xbyak::Xmm to = ctx.reg_alloc.ScratchXmm();
const bool round_to_nearest = args[1].GetImmediateU1();
ASSERT_MSG(!round_to_nearest, "round_to_nearest unimplemented");
if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX512F)) {
const Xbyak::Reg64 from = ctx.reg_alloc.UseGpr(args[0]);
code.vcvtusi2sd(to, to, from.cvt32());
} else {
// We are using a 64-bit GPR register to ensure we don't end up treating the input as signed
const Xbyak::Reg64 from = ctx.reg_alloc.UseScratchGpr(args[0]);
code.mov(from.cvt32(), from.cvt32()); // TODO: Verify if this is necessary
code.cvtsi2sd(to, from);
}