[PATCH] D127443: [InstCombine] add zeroinitializer handling to memchr folders
Martin Sebor via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Jun 9 14:29:12 PDT 2022
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Due to a limitation of the `getConstantStringInfo` function the `memchr` and `memrchr` folders are unable to fold calls with `zeroinitialzer` constant arrays. These are rare as global top-level objects but likely more common as members of other aggregates, the handling of which has been proposed in D125114 <https://reviews.llvm.org/D125114>. In anticipation of that enhancement this patch removes the `getConstantStringInfo` limitation and enables two of its clients, the `memchr` and `memrchr` handlers, to fold calls with `zeroinitialzer` constants. It adds a `TODO` comment to enhance the third client (`memccpy`).
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D127443
Files:
llvm/include/llvm/Analysis/ValueTracking.h
llvm/lib/Analysis/ValueTracking.cpp
llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
llvm/test/Transforms/InstCombine/memchr-6.ll
llvm/test/Transforms/InstCombine/memchr-7.ll
llvm/test/Transforms/InstCombine/memrchr-6.ll
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