| commit | 81c57d04cebfa3428a2b16cc31d7193003f2d4d5 | |
| author | Sam Parker <sam.parker@arm.com> | |
| Tue, 17 Sep 2019 12:19:32 +0000 (17 12:19 +0000) | ||
| committer | Sam Parker <sam.parker@arm.com> | |
| Tue, 17 Sep 2019 12:19:32 +0000 (17 12:19 +0000) | ||
| tree | 728ea9bcc66c5b60c80b690ad00f10f422523751 | treesnapshot (tar.gz zip) |
| parent | 5ca1bec7882653dbaefdab00487d212f26b39fa5 | commitdiff |
[ARM][LowOverheadLoops] Add LR def safety check
Converting the *LoopStart pseudo instructions into DLS/WLS results in
LR being defined. These instructions were inserted on the assumption
that LR would already contain the loop counter because a mov is
introduced during ISel as the the consumers in the loop can only use
LR. That assumption proved wrong!
So perform a safety check, finding an appropriate place to insert the
DLS/WLS instructions or revert if this isn't possible.
Differential Revision: https://reviews.llvm.org/D67539
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372111 91177308-0d34-0410-b5e6-96231b3b80d8
Converting the *LoopStart pseudo instructions into DLS/WLS results in
LR being defined. These instructions were inserted on the assumption
that LR would already contain the loop counter because a mov is
introduced during ISel as the the consumers in the loop can only use
LR. That assumption proved wrong!
So perform a safety check, finding an appropriate place to insert the
DLS/WLS instructions or revert if this isn't possible.
Differential Revision: https://reviews.llvm.org/D67539
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372111 91177308-0d34-0410-b5e6-96231b3b80d8
15 files changed: