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When we know RDX is unavailable, use RAX instead. Should be fine here.

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This commit is contained in:
Nick Lewycky 2019-10-11 10:11:27 -07:00
parent d6eba03a2f
commit b75e5c0c7c
1 changed files with 3 additions and 3 deletions
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6
lib/singlepass-backend/src/codegen_x64.rs
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@ -2874,15 +2874,15 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
a.emit_mov(Size::S64, Location::Memory(GPR::RDX, 0), Location::XMM(x));
}
XMMOrMemory::Memory(base, disp) => {
// TODO: What if base == RDX?
let neg_zero_base = if base == GPR::RDX { GPR::RAX } else { GPR::RDX };
a.emit_mov(
Size::S64,
Location::Imm64((&NEG_ZERO as *const u128) as u64),
Location::GPR(GPR::RDX),
Location::GPR(neg_zero_base),
);
a.emit_mov(
Size::S64,
Location::Memory(GPR::RDX, 0),
Location::Memory(neg_zero_base, 0),
Location::Memory(base, disp),
);
}