[PATCH] D13358: InstCombine: Fold comparisons between unguessable allocas and other pointers

[Hans Wennborg via llvm-commits]

hans retitled this revision from "InstSimplify: Fold comparisons between unguessable allocas and other pointers" to "InstCombine: Fold comparisons between unguessable allocas and other pointers".
hans updated the summary for this revision.
hans updated this revision to Diff 36417.
hans added a comment.

Moving this to instcombine.

The previous patch ran into a terrifying bug where instsimplify would get run on IR that wasn't fully constructed yet, which meant it couldn't see all uses of an alloca and folded a bit too aggressively.

This new patch successfully bootstraps Clang. The optimization fires 67 times during bootstrap and reduces Clang binary size with 8519 bytes.


http://reviews.llvm.org/D13358

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  lib/Transforms/InstCombine/InstCombineInternal.h
  test/Transforms/InstCombine/compare-alloca.ll

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