Alexey Bataev 29965753c8
[SLP] Fix for PR32036: Vectorized horizontal reduction returning wrong ...
result
Summary:
If the same value is used several times as an extra value, SLP
vectorizer takes it into account only once instead of actual number of
using.
For example:
```
int val = 1;
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 8; x++) {
val = val + input[y * 8 + x] + 3;
}
}
```
We have 2 extra rguments: `1` - initial value of horizontal reduction
and `3`, which is added 8*8 times to the reduction. Before the patch we
added `1` to the reduction value and added once `3`, though it must be
added 64 times.
Reviewers: mkuper, mzolotukhin
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D30262
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295949 91177308-0d34-0410-b5e6-96231b3b80d8
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Alexey Bataev
29965753c8