[PATCH] D16337: [LibCallSimplifier] fold memset(malloc(x), 0, x) --> calloc(1, x)

[Sanjay Patel via llvm-commits]

spatel created this revision.
spatel added reviewers: mcrosier, davide, hfinkel.
spatel added a subscriber: llvm-commits.
Herald added a subscriber: mcrosier.

This is a partial fix for PR25892:
https://llvm.org/bugs/show_bug.cgi?id=25892

It should handle the reported case, but as noted by the 'TODO' comments in the patch, we should also match patterns that include regular memset() and the llvm.memset() intrinsic in addition to memset_chk().

http://reviews.llvm.org/D16337

Files:
  include/llvm/Transforms/Utils/SimplifyLibCalls.h
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Transforms/Utils/SimplifyLibCalls.cpp
  test/Transforms/InstCombine/memset_chk-1.ll

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