[SystemZ] Bugfix in shouldCoalesce()

It was discovered in randomized testing that the SystemZ implementation of
shouldCoalesce() could be caused to crash when subreg liveness was
enabled. This was because an undef use of the virtual register was copied
outside current MBB at the point of shouldCoalesce() being called. For more
details, see https://bugs.llvm.org/show_bug.cgi?id=39276.

This patch changes the check for MBB locality from livein/liveout checks to
do checks for all instructions of both intervals being inside MBB. This
avoids the cases with dead defs / undef uses outside MBB, which are not
affecting liveness in/out of MBB.

The original test case included as a reduced .mir test case.

Review: Ulrich Weigand
https://reviews.llvm.org/D54197

llvm-svn: 346406

0 files changed, 0 insertions, 0 deletions