| commit | 68378dff20ed3412d3c35611051756bd49aed044 | |
| author | Simon Atanasyan <simon@atanasyan.com> | |
| Wed, 11 Sep 2019 11:16:06 +0000 (11 11:16 +0000) | ||
| committer | Simon Atanasyan <simon@atanasyan.com> | |
| Wed, 11 Sep 2019 11:16:06 +0000 (11 11:16 +0000) | ||
| tree | dda89648da4a937334429d955c6dbd3e8f353e06 | treesnapshot (tar.gz zip) |
| parent | 8ea51586a933f3a4f74228d9a6d275c5fef02edd | commitdiff |
[mips][msa] Fix infinite loop for mips.nori.b intrinsic
When value of immediate in `mips.nori.b` is 255 (which has all ones in
binary form as 8bit integer) DAGCombiner and Legalizer would fall in an
infinite loop. DAGCombiner would try to simplify `or %value, -1` by
turning `%value` into UNDEF. Legalizer will turn it back into `Constant<0>`
which would then be again turned into UNDEF by DAGCombiner. To avoid this
loop we make UNDEF legal for MSA int types on Mips.
Patch by Mirko Brkusanin.
Differential Revision: https://reviews.llvm.org/D67280
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371607 91177308-0d34-0410-b5e6-96231b3b80d8
When value of immediate in `mips.nori.b` is 255 (which has all ones in
binary form as 8bit integer) DAGCombiner and Legalizer would fall in an
infinite loop. DAGCombiner would try to simplify `or %value, -1` by
turning `%value` into UNDEF. Legalizer will turn it back into `Constant<0>`
which would then be again turned into UNDEF by DAGCombiner. To avoid this
loop we make UNDEF legal for MSA int types on Mips.
Patch by Mirko Brkusanin.
Differential Revision: https://reviews.llvm.org/D67280
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371607 91177308-0d34-0410-b5e6-96231b3b80d8