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| author | Roman Lebedev <lebedev.ri@gmail.com> | 2022-12-20 23:57:10 +0300 |
|---|---|---|
| committer | Roman Lebedev <lebedev.ri@gmail.com> | 2022-12-21 02:01:14 +0300 |
| commit | a5b56313dd8cf49a5128f93361a4bcc51b8a5485 (patch) | |
| tree | eec5d19d3f367cd71615816b635be6777b0bf77b /llvm/lib/Support/VirtualFileSystem.cpp | |
| parent | bf94eac6a3f7c5cd8941956d44c15524fa3751bd (diff) | |
| download | llvm-a5b56313dd8cf49a5128f93361a4bcc51b8a5485.zip llvm-a5b56313dd8cf49a5128f93361a4bcc51b8a5485.tar.gz llvm-a5b56313dd8cf49a5128f93361a4bcc51b8a5485.tar.bz2 | |
[llvm-exegesis] `AliasingConfigurations`: pay attention to forbidden registers
When trying to measure latency of certain opcodes, e.g.
`./bin/llvm-exegesis --opcode-name=BT32ri8 --mode=latency --repetition-mode=loop --benchmarks-file=- --max-configs-per-opcode=65536`,
we'd pick such an aliasing instruction, and such an aliasing registers,
that would alias with forbidden registers.
And in particular with loop counter in `loop` repetition mode,
which made the measurements never finish.
This does not address all such cases, only the most obvious one.
The added test case fails without the patch.
Fixes https://github.com/llvm/llvm-project/issues/59441
Diffstat (limited to 'llvm/lib/Support/VirtualFileSystem.cpp')
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