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| author | John Brawn <john.brawn@arm.com> | 2017-06-28 14:11:15 +0000 |
|---|---|---|
| committer | John Brawn <john.brawn@arm.com> | 2017-06-28 14:11:15 +0000 |
| commit | 75d76e5e956c75fc524253d57153e40836d3e6d5 (patch) | |
| tree | 67844a7a4f3db463b3d3abbbb476d2e64c04c14a /clang/lib/Frontend/CreateInvocationFromCommandLine.cpp | |
| parent | 48b30c3d55b450f841b222394c840da12f0329a2 (diff) | |
| download | llvm-75d76e5e956c75fc524253d57153e40836d3e6d5.zip llvm-75d76e5e956c75fc524253d57153e40836d3e6d5.tar.gz llvm-75d76e5e956c75fc524253d57153e40836d3e6d5.tar.bz2 | |
[ARM] Improve if-conversion for M-class CPUs without branch predictors
The current heuristic in isProfitableToIfCvt assumes we have a branch predictor,
and so gives the wrong answer in some cases when we don't. This patch adds a
subtarget feature to indicate that a subtarget has no branch predictor, and
changes the heuristic in isProfitableToiIfCvt when it's present. This gives a
slight overall improvement in a set of embedded benchmarks on Cortex-M4 and
Cortex-M33.
Differential Revision: https://reviews.llvm.org/D34398
llvm-svn: 306547
Diffstat (limited to 'clang/lib/Frontend/CreateInvocationFromCommandLine.cpp')
0 files changed, 0 insertions, 0 deletions