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windows/x64 call convention: only use XMM0 for float return values (#691)

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This commit is contained in:
Steffen Butzer
2019-03-09 21:27:55 +01:00
committed by Benjamin Bouvier
parent 00cfe62380
commit 92b3987e54
2 changed files with 12 additions and 5 deletions
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9
cranelift/codegen/src/isa/x86/abi.rs
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@@ -161,13 +161,14 @@ pub fn legalize_signature(sig: &mut ir::Signature, triple: &Triple, _current: bo
legalize_args(&mut sig.params, &mut args);
let regs = if sig.call_conv == CallConv::WindowsFastcall {
&RET_GPRS_WIN_FASTCALL_X64[..]
let (regs, fpr_limit) = if sig.call_conv == CallConv::WindowsFastcall {
// windows-x64 calling convention only uses XMM0 or RAX for return values
(&RET_GPRS_WIN_FASTCALL_X64[..], 1)
} else {
&RET_GPRS[..]
(&RET_GPRS[..], 2)
};
let mut rets = Args::new(bits, regs, 2, sig.call_conv);
let mut rets = Args::new(bits, regs, fpr_limit, sig.call_conv);
legalize_args(&mut sig.returns, &mut rets);
}