[PATCH] D57048: [SystemZ] Handle DBG_VALUE instructions in two places in backend

[Jonas Paulsson via Phabricator via llvm-commits]

jonpa created this revision.
jonpa added a reviewer: uweigand.

Two backend optimizations failed to handle cases when compiled with -g, due to failing to consider DBG_VALUE instructions. This was in SystemZTargetLowering::emitSelect() and SystemZElimCompare::getRegReferences().

This patch makes sure that DBG_VALUEs are recognized so that they do not affect these optimizers.

Tests for branch-on-count, load-and-trap and consecutive selects.


https://reviews.llvm.org/D57048

Files:
  lib/Target/SystemZ/SystemZElimCompare.cpp
  lib/Target/SystemZ/SystemZISelLowering.cpp
  test/CodeGen/SystemZ/debuginstr-00.mir
  test/CodeGen/SystemZ/debuginstr-01.mir
  test/CodeGen/SystemZ/debuginstr-02.mir

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