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Rollup merge of #111331 - taiki-e:s390x-asm-cc, r=Amanieu

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Mark s390x condition code register as clobbered in inline assembly

Various s390x instructions (arithmetic operations, logical operations, comparisons, etc. see also "Condition Codes" section in [z/Architecture Reference Summary](https://www.ibm.com/support/pages/zarchitecture-reference-summary)) modify condition code register `cc`, but AFAIK there is currently no way to mark it as clobbered in `asm!`.

`cc` register definition in LLVM:
https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/SystemZ/SystemZRegisterInfo.td#L320

This PR also updates asm_experimental_arch docs in the unstable-book to mention s390x registers.

cc `@uweigand`

r? `@Amanieu`
This commit is contained in:
Yuki Okushi 2023-05-08 19:41:50 +09:00 • committed by GitHub
commit c122ac3e69
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2 changed files with 14 additions and 3 deletions
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compiler/rustc_codegen_llvm/src/asm.rs
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@ -238,7 +238,9 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
InlineAsmArch::Hexagon => {}
InlineAsmArch::LoongArch64 => {}
InlineAsmArch::Mips | InlineAsmArch::Mips64 => {}
InlineAsmArch::S390x => {}
InlineAsmArch::S390x => {
constraints.push("~{cc}".to_string());
}
InlineAsmArch::SpirV => {}
InlineAsmArch::Wasm32 | InlineAsmArch::Wasm64 => {}
InlineAsmArch::Bpf => {}