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| author | Dawid Jurczak <dawid_jurek@vp.pl> | 2021-08-25 13:13:18 +0200 |
|---|---|---|
| committer | Dawid Jurczak <dawid_jurek@vp.pl> | 2021-08-25 14:22:40 +0200 |
| commit | bdcf04246c401aec9bdddf32fabc99fa4834a477 (patch) | |
| tree | 5e76b6b71c513d4cabfdc46707ae08eedab985c6 /llvm/lib/CodeGen/LiveDebugVariables.cpp | |
| parent | e708808f875f58344ecaad66d9e6e167ca7ac90a (diff) | |
| download | llvm-bdcf04246c401aec9bdddf32fabc99fa4834a477.zip llvm-bdcf04246c401aec9bdddf32fabc99fa4834a477.tar.gz llvm-bdcf04246c401aec9bdddf32fabc99fa4834a477.tar.bz2 | |
[LoopIdiom] Don't transform loop into memmove when load from body has more than one use
This change fixes issue found by Markus: https://reviews.llvm.org/rG11338e998df1
Before this patch following code was transformed to memmove:
for (int i = 15; i >= 1; i--) {
p[i] = p[i-1];
sum += p[i-1];
}
However load from p[i-1] is used not only by store to p[i] but also by sum computation.
Therefore we cannot emit memmove in loop header.
Differential Revision: https://reviews.llvm.org/D107964
Diffstat (limited to 'llvm/lib/CodeGen/LiveDebugVariables.cpp')
0 files changed, 0 insertions, 0 deletions