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| author | Hao Liu <hliu@os.amperecomputing.com> | 2023-07-06 10:03:47 +0800 |
|---|---|---|
| committer | Hao Liu <hliu@os.amperecomputing.com> | 2023-07-06 10:06:01 +0800 |
| commit | 7339e725b995912747c01c3ec80ce602512f45df (patch) | |
| tree | aa48dddc73b417862209f342bf1d7d765a25ec83 /libgcc | |
| parent | 5158918aa211ee85176c058831707dbb3eaf0fb4 (diff) | |
| download | gcc-7339e725b995912747c01c3ec80ce602512f45df.zip gcc-7339e725b995912747c01c3ec80ce602512f45df.tar.gz gcc-7339e725b995912747c01c3ec80ce602512f45df.tar.bz2 | |
tree-optimization/110474 - Vect: select small VF for epilog of unrolled loop
If a loop is unrolled during vectorization (i.e. suggested_unroll_factor > 1),
the VFs of both main and epilog loop are enlarged. The epilog vect loop is
specific for a loop with small iteration counts, so a large VF may hurt
performance.
This patch unscales the main loop VF by suggested_unroll_factor while selecting
the epilog loop VF, so that it will be the same as vectorized loop without
unrolling (i.e. suggested_unroll_factor = 1).
gcc/ChangeLog:
PR tree-optimization/110474
* tree-vect-loop.cc (vect_analyze_loop_2): unscale the VF by suggested
unroll factor while selecting the epilog vect loop VF.
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/pr110474.c: New testcase.
Diffstat (limited to 'libgcc')
0 files changed, 0 insertions, 0 deletions