| author | James Molloy <james.molloy@arm.com> | |
| Sat, 27 Sep 2014 17:02:54 +0000 (17:02 +0000) | ||
| committer | James Molloy <james.molloy@arm.com> | |
| Sat, 27 Sep 2014 17:02:54 +0000 (17:02 +0000) | ||
| commit | aada52189ea4120793d8e2818703bef6649d79e4 | |
| tree | b377808e94ddf0505f1998705a2fea8df6c2e786 | tree | snapshot (tar.xz tar.gz zip) |
| parent | af34c3a9952b274d4adcc2cc46aca6ee03f7b24b | commit | diff |
[AArch64] Redundant store instructions should be removed as dead code
If there is a store followed by a store with the same value to the same location, then the store is dead/noop. It can be removed.
This problem is found in spec2006-197.parser.
For example,
stur w10, [x11, #-4]
stur w10, [x11, #-4]
Then one of the two stur instructions can be removed.
Patch by David Xu!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218569 91177308-0d34-0410-b5e6-96231b3b80d8
If there is a store followed by a store with the same value to the same location, then the store is dead/noop. It can be removed.
This problem is found in spec2006-197.parser.
For example,
stur w10, [x11, #-4]
stur w10, [x11, #-4]
Then one of the two stur instructions can be removed.
Patch by David Xu!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218569 91177308-0d34-0410-b5e6-96231b3b80d8
| lib/CodeGen/SelectionDAG/DAGCombiner.cpp | diff | blob | history | |
| test/CodeGen/AArch64/Redundantstore.ll | [new file with mode: 0644] | blob |