jyknight added a comment.
This code doesn't handle multiple alternatives in a constraint.
E.g. `"={eax}{ebx}"` or `"={eax}{ebx},m"`.
See the GCC docs for the C-level syntax
https://gcc.gnu.org/onlinedocs/gcc/Multi-Alternative.html#Multi-Alternative
and LLVM IR docs for the IR syntax:
https://llvm.org/docs/LangRef.html#constraint-codes
LLVM doesn't handle alternatives very well in the backend, but Clang at least
should parse and properly generate LLVM asm strings for these cases I think.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D105142/new/
https://reviews.llvm.org/D105142
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