[PATCH] D34109: [AArch64] Update successor probabilities after ccmp-conversion

[Matthew Simpson via Phabricator via llvm-commits]

mssimpso created this revision.
Herald added subscribers: kristof.beyls, javed.absar, rengolin, aemerson.

This patch modifies the conditional compares pass so that it keeps the successor probabilities of the head block up-to-date after the conversion. Previously, the successor probabilities were being normalized to a uniform distribution, even though they may have been heavily biased prior to the conversion (e.g., if one of the edges was the back edge of a loop). This loss of information affected passes later in the pipeline.


https://reviews.llvm.org/D34109

Files:
  lib/Target/AArch64/AArch64ConditionalCompares.cpp
  test/CodeGen/AArch64/arm64-ccmp.ll
  test/CodeGen/AArch64/ccmp-successor-probs.mir

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