https://bugs.llvm.org/show_bug.cgi?id=47488
Bug ID: 47488
Summary: DFSan event_callbacks.c breaks with MemorySSA DSE
Product: compiler-rt
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: dfsan
Assignee: unassignedbugs at nondot.org
Reporter: jeremy.morse.llvm at gmail.com
CC: florian_hahn at apple.com, llvm-bugs at lists.llvm.org,
mascasa at google.com, skerner at chromium.org,
vitalybuka at google.com
After dead-store-elimination began using MemorySSA in fb109c42d9, a dfsan test
has begun failing:
compiler-rt/test/dfsan/event_callbacks.c
As shown on this buildbot:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux/builds/29539
Because the memcpy/memmove calls at the end of the main function are now
optimised out. It looks like this is just a case of the test being optimised
more than expected. Both DSE and dfsan are out of my area of expertise, so I'm
marking the test XFail for now, CCing recent dfsan authors and Florian.
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