guy-david wrote:
Comparison between latest Clang and GCC's output for a snippet out of a
benchmark that could use this optimization: https://godbolt.org/z/35EEvcsPr.
I've ran llvm-test-suite ten times for the before and after, it executed
correctly and expectedly saw no performance gains:
```
Tests: 3326
Metric: exec_time
exec_time
l/r lhs rhs diff
count 3326.000000 3326.000000 1554.000000
mean 885.285851 885.132328 inf
std 20163.199507 20160.504672 NaN
min 0.000000 0.000000 -1.000000
25% 0.000000 0.000000 -0.004020
50% 0.000000 0.000000 0.000000
75% 1.741165 1.840265 0.003943
max 802971.672414 802823.530425 inf
```
Also built a bootstrap build and confirmed that `ninja stage2-check-all` passes
successfully, except for a few libcxx benchmarks that seem to fail regardless.
https://github.com/llvm/llvm-project/pull/136792
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