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Don't allocate another register when it's safe to reuse dst.

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This commit is contained in:
Nick Lewycky 2019-10-11 10:53:39 -07:00
parent b75e5c0c7c
commit 0f712c90ab
1 changed files with 11 additions and 9 deletions
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20
lib/singlepass-backend/src/codegen_x64.rs
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@ -2836,16 +2836,18 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
Location::GPR(GPR::RDX),
),
};
// TODO: we can skip this when dst is an XMM reg.
let tmp_xmm = if src1 == XMM::XMM0 {
if src2 == XMMOrMemory::XMM(XMM::XMM1) {
XMM::XMM2
} else {
XMM::XMM1
}
let tmp_xmm = if dst != src1 && XMMOrMemory::XMM(dst) != src2 {
dst
} else {
XMM::XMM0
if src1 == XMM::XMM0 {
if src2 == XMMOrMemory::XMM(XMM::XMM1) {
XMM::XMM2
} else {
XMM::XMM1
}
} else {
XMM::XMM0
}
};
match src2 {
XMMOrMemory::XMM(x) => {