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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2017-05-04 17:43:43 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco@gcc.gnu.org> | 2017-05-04 17:43:43 +0000 |
| commit | 6b13482bb6c33d2d37494ec33e2028fcbe4e0635 (patch) | |
| tree | 476b428a993a41239bf817f3a96793133a260e2b /gcc/builtins.c | |
| parent | 0f2c4a8f1d2903f9c07b86bf8faeabe1a01ed34b (diff) | |
| download | gcc-6b13482bb6c33d2d37494ec33e2028fcbe4e0635.zip gcc-6b13482bb6c33d2d37494ec33e2028fcbe4e0635.tar.gz gcc-6b13482bb6c33d2d37494ec33e2028fcbe4e0635.tar.bz2 | |
With -mcpu=generic the loop alignment is currently 4.
With -mcpu=generic the loop alignment is currently 4. All but one of the
supported cores use 8 or higher. Since using 8 provides performance gains
on several cores, it is best to use that by default. As discussed in [1],
the jump alignment has no effect on performance, yet has a relatively high
codesize cost [2], so setting it to 4 is best. This gives a 0.2% overall
codesize improvement as well as performance gains in several benchmarks.
gcc/
* config/aarch64/aarch64.c (generic_tunings): Set jump alignment to 4.
Set loop alignment to 8.
[1] https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00574.html
[2] https://gcc.gnu.org/ml/gcc-patches/2016-06/msg02075.html
From-SVN: r247608
Diffstat (limited to 'gcc/builtins.c')
0 files changed, 0 insertions, 0 deletions