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| author | Hal Finkel <hfinkel@anl.gov> | 2012-06-19 13:57:17 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2012-06-19 13:57:17 +0000 |
| commit | d465810f7ccc9e4191678bf73031aa5b0c2521c1 (patch) | |
| tree | 61a95cd7b5d9dff67c1e42abfd7219cd0e261ea9 /llvm/lib/Support/StringMap.cpp | |
| parent | f98d813948ffd00a0bc47620860707f4628a86c4 (diff) | |
| download | bcm5719-llvm-d465810f7ccc9e4191678bf73031aa5b0c2521c1.tar.gz bcm5719-llvm-d465810f7ccc9e4191678bf73031aa5b0c2521c1.zip | |
Mark most PPC register classes to avoid write-after-write.
For processors with the G5-like instruction-grouping scheme, this helps avoid
early group termination due to a write-after-write dependency within the group.
It should also help on pipelined embedded cores.
On POWER7, over the test suite, this gives an average 0.5% speedup. The largest
speedups are:
SingleSource/Benchmarks/Stanford/Quicksort - 33%
MultiSource/Applications/d/make_dparser - 21%
MultiSource/Benchmarks/FreeBench/analyzer/analyzer - 12%
MultiSource/Benchmarks/MiBench/telecomm-FFT/telecomm-fft - 12%
Largest slowdowns:
SingleSource/Benchmarks/Stanford/Bubblesort - 23%
MultiSource/Benchmarks/Prolangs-C++/city/city - 21%
MultiSource/Benchmarks/BitBench/uuencode/uuencode - 16%
MultiSource/Benchmarks/mediabench/mpeg2/mpeg2dec/mpeg2decode - 13%
llvm-svn: 158719
Diffstat (limited to 'llvm/lib/Support/StringMap.cpp')
0 files changed, 0 insertions, 0 deletions
