[PATCH] D76060: [NFC][DAGCombine] Extract post-inc logic

[David Spickett via Phabricator via llvm-commits]

DavidSpickett added a comment.

Hi @samparker , this change caused a regression in Spec2k6 which we run in Linaro's CI. The root cause seems to be that loads with a post increment became load plus an add in one specific function. Certainly unexpected for an NFC change.

E.g.

  - ldr	x1, [x20], #48
  + ldr	x1, [x1]
  + add	x2, x19, #48

To reproduce build the attached source file with:
clang -O2 --target=aarch64-linux-gnu -c ~/io_lat4.i -S -o -

You should see a difference in the "write_checksum" function.

F11683963: io_lat4.i <https://reviews.llvm.org/F11683963>


Repository:
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CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D76060/new/

https://reviews.llvm.org/D76060