[PATCH] D57789: [CGP] form usub with overflow from sub+icmp
Sanjay Patel via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Feb 11 10:29:52 PST 2019
spatel updated this revision to Diff 186286.
spatel added a comment.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.
Side-step controversy by adding a TLI hook. This should preserve existing behavior for uaddo and usubo for all targets, except x86 which now allows usubo formation. It seems likely that other targets like AArch64, AMDGPU, and PPC should allow usubo too, but they can do that selectively as follow-ups.
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