[PATCH] D34437: [InstCombine] Don't let folding (select (icmp eq (and X, C1), 0), Y, (or Y, C2)) create more instructions than it removes

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.

Previously this folding had no checks to see if it was going to result in less instructions. This was pointed out during the review of https://reviews.llvm.org/D34184

This patch adds code to count how many instructions its going to create vs how many its going to remove so we can make a proper decision.


https://reviews.llvm.org/D34437

Files:
  lib/Transforms/InstCombine/InstCombineSelect.cpp
  test/Transforms/InstCombine/select-with-bitwise-ops.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D34437.103321.patch
Type: text/x-patch
Size: 7072 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20170621/5d4b9594/attachment.bin>