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Auto merge of #123507 - dpaoliello:arm64ecasm, r=Amanieu

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Add support for Arm64EC inline assembly (as unstable)

Compiler support for Arm64EC assembly mostly reuses the existing AArch64 support, except that it needs to block registers that are not permitted: <https://learn.microsoft.com/en-us/windows/arm/arm64ec-abi#register-mapping-and-blocked-registers>

For assembly authors there are several caveats and differences that need to be considered, I've provided documentation for this as part of the "Standard Library Support" PR: <https://github.com/rust-lang/rust/pull/123144/files#diff-6b08532480943c8b82f5dbda7ee1521afa74c9f626466aeb308dfa6956397edd>

r? rust-lang/compiler
This commit is contained in:
bors 2024-04-11 07:15:04 +00:00
commit 05ccc49a44
5 changed files with 158 additions and 103 deletions
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2
compiler/rustc_codegen_llvm/src/asm.rs
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@ -220,7 +220,7 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
constraints.append(&mut clobbers);
if !options.contains(InlineAsmOptions::PRESERVES_FLAGS) {
match asm_arch {
InlineAsmArch::AArch64 | InlineAsmArch::Arm => {
InlineAsmArch::AArch64 | InlineAsmArch::Arm64EC | InlineAsmArch::Arm => {
constraints.push("~{cc}".to_string());
}
InlineAsmArch::X86 | InlineAsmArch::X86_64 => {