diff options
| author | Chandler Carruth <chandlerc@gmail.com> | 2012-04-16 22:03:00 +0000 |
|---|---|---|
| committer | Chandler Carruth <chandlerc@gmail.com> | 2012-04-16 22:03:00 +0000 |
| commit | f1a60c734c2edb97ab75e67328935538fae5bae6 (patch) | |
| tree | a8ca8b24baa1537f51f682df1becfdecd315ac00 /test/TableGen | |
| parent | 68f89a61587e8d482347cf892c2670a869a1ad61 (diff) | |
| download | external_llvm-f1a60c734c2edb97ab75e67328935538fae5bae6.zip external_llvm-f1a60c734c2edb97ab75e67328935538fae5bae6.tar.gz external_llvm-f1a60c734c2edb97ab75e67328935538fae5bae6.tar.bz2 | |
Fix updateTerminator to be resiliant to degenerate terminators where
both fallthrough and a conditional branch target the same successor.
Gracefully delete the conditional branch and introduce any unconditional
branch needed to reach the actual successor. This fixes memory
corruption in 2009-06-15-RegScavengerAssert.ll and possibly other tests.
Also, while I'm here fix a latent bug I spotted by inspection. I never
applied the same fundamental fix to this fallthrough successor finding
logic that I did to the logic used when there are no conditional
branches. As a consequence it would have selected landing pads had they
be aligned in just the right way here. I don't have a test case as
I spotted this by inspection, and the previous time I found this
required have of TableGen's source code to produce it. =/ I hate backend
bugs. ;]
Thanks to Jim Grosbach for helping me reason through this and reviewing
the fix.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154867 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/TableGen')
0 files changed, 0 insertions, 0 deletions