[PATCH] D149246: [RISCV] Relax rules for ordering s/z/x prefixed extensions in ISA naming strings

[Palmer Dabbelt via Phabricator via cfe-commits]

palmer-dabbelt added a comment.

IDK about the specifics here, but I think in general being more permissive on ISA string parsing is the way to go.  The rules have changed so many times it's not really viable to follow them, so we're sort of just stuck with a bunch of historally-driven implementation-specific behavior.

I've got a TODO floating around somewhere to document what GCC accepts, but it's super clunky and I get tired every time I try and look...


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  https://reviews.llvm.org/D149246/new/

https://reviews.llvm.org/D149246