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Add links to relevant pages to find constraint information #103021

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Merged
merged 1 commit into from
Oct 14, 2022
Merged

Add links to relevant pages to find constraint information #103021

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4 changes: 4 additions & 0 deletions compiler/rustc_codegen_llvm/src/asm.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -551,6 +551,8 @@ fn reg_to_llvm(reg: InlineAsmRegOrRegClass, layout: Option<&TyAndLayout<'_>>) ->
format!("{{{}}}", reg.name())
}
}
// The constraints can be retrieved from
// https://llvm.org/docs/LangRef.html#supported-constraint-code-list
InlineAsmRegOrRegClass::RegClass(reg) => match reg {
InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::reg) => "r",
InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg) => "w",
Expand Down Expand Up @@ -624,6 +626,8 @@ fn modifier_to_llvm(
reg: InlineAsmRegClass,
modifier: Option<char>,
) -> Option<char> {
// The modifiers can be retrieved from
// https://llvm.org/docs/LangRef.html#asm-template-argument-modifiers
match reg {
InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::reg) => modifier,
InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg)
Expand Down