[PATCH] D10416: Use function attribute "arm-restrict-it"
Jim Grosbach via llvm-commits
llvm-commits at lists.llvm.org
Tue Sep 8 11:31:39 PDT 2015
grosbach added a comment.
For the backend attribute, having -arm-restrict-it (or equivalent) transitively disable HasV8Ops is really, really bad. Those should be completely independent selections. The former is about tuning instruction selection (via if-conversion in this case) based on the microarchitecture. The latter is about which instructions are available in the first place. The former does not imply the latter.
I don't think there's much point to disabling restrict-it when targeting v8 from an end-user POV, but it's pretty useful for the backend. We want to be able to write test cases that make sure it's working, for example.
Do I understand right there's a frontend option, too? That's the only context in which gcc compatibility makes much sense. I don't see any value other than slavishly following gcc's option list to having this be exposed to end users in clang. I'd much rather it be entirely in the backend.
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