diff options
| author | Wei Mi <wmi@google.com> | 2015-05-06 17:12:25 +0000 |
|---|---|---|
| committer | Wei Mi <wmi@google.com> | 2015-05-06 17:12:25 +0000 |
| commit | 062c74484d4788728a50db025a237db03f0cabe6 (patch) | |
| tree | 5eeac222e8b5db4826578ae00f2f424ef71b1eea /llvm/lib/IR/Attributes.cpp | |
| parent | 633dba4f412fd7cfe0e1b5d7bdc60338e81beaf3 (diff) | |
| download | bcm5719-llvm-062c74484d4788728a50db025a237db03f0cabe6.tar.gz bcm5719-llvm-062c74484d4788728a50db025a237db03f0cabe6.zip | |
[X86] Disable loop unrolling in loop vectorization pass when VF is 1.
The patch disabled unrolling in loop vectorization pass when VF==1 on x86 architecture,
by setting MaxInterleaveFactor to 1. Unrolling in loop vectorization pass may introduce
the cost of overflow check, memory boundary check and extra prologue/epilogue code when
regular unroller will unroll the loop another time. Disable it when VF==1 remove the
unnecessary cost on x86. The same can be done for other platforms after verifying
interleaving/memory bound checking to be not perf critical on those platforms.
Differential Revision: http://reviews.llvm.org/D9515
llvm-svn: 236613
Diffstat (limited to 'llvm/lib/IR/Attributes.cpp')
0 files changed, 0 insertions, 0 deletions
