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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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8
lib/singlepass-backend/src/codegen_x64.rs
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@ -2836,9 +2836,10 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
Location::GPR(GPR::RDX), Location::GPR(GPR::RDX),
), ),
}; };
let tmp_xmm = if dst != src1 && XMMOrMemory::XMM(dst) != src2 {
// TODO: we can skip this when dst is an XMM reg. dst
let tmp_xmm = if src1 == XMM::XMM0 { } else {
if src1 == XMM::XMM0 {
if src2 == XMMOrMemory::XMM(XMM::XMM1) { if src2 == XMMOrMemory::XMM(XMM::XMM1) {
XMM::XMM2 XMM::XMM2
} else { } else {
@ -2846,6 +2847,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
} }
} else { } else {
XMM::XMM0 XMM::XMM0
}
}; };
match src2 { match src2 {
XMMOrMemory::XMM(x) => { XMMOrMemory::XMM(x) => {