[PATCH] D27853: [CodeGenPrep]Restructure promoting Ext to form ExtLoad

[Jun Bum Lim via Phabricator via llvm-commits]

junbuml created this revision.
junbuml added reviewers: qcolombet, jmolloy, mcrosier.
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Instead of just looking for a load which is mergable with Ext to form ExtLoad, trying to promote Exts as long as the cost is acceptable. This change is not a NFC as it continue promoting Exts even after finding a load during promotions; the change in arm64-codegen-prepare-extload.ll described in 2.b might show the case. 
This change was motivated from https://reviews.llvm.org/D26524.  Based on this change, I will move the transformation performed in aarch64-type-promotion into CGP.


https://reviews.llvm.org/D27853

Files:
  lib/CodeGen/CodeGenPrepare.cpp
  test/CodeGen/AArch64/arm64-codegen-prepare-extload.ll
  test/CodeGen/X86/codegen-prepare-extload.ll

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