[PATCH] D124419: [InstCombine] try to fold icmp with mismatched extended operands
Sanjay Patel via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Apr 25 14:11:03 PDT 2022
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If a value is known to be non-negative and zexted, that's the same thing as sexted.
So for the purpose of looking past the casts with an icmp, treat it as if it was a sext:
https://alive2.llvm.org/ce/z/_BDsGV
This is necessary, but not enough to solve the motivating problem:
https://github.com/llvm/llvm-project/issues/55013
https://reviews.llvm.org/D124419
Files:
llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
llvm/lib/Transforms/InstCombine/InstCombineInternal.h
llvm/test/Transforms/InstCombine/icmp-ext-ext.ll
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