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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2019-10-14 12:21:14 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco@gcc.gnu.org> | 2019-10-14 12:21:14 +0000 |
| commit | c7207339a7dbce5b68f872064e624dcf1639ba46 (patch) | |
| tree | 3fdec4e4d17c72bb738c9859b3454f12d7e6d46f /gcc | |
| parent | 7bd8bec53f0e43c7a7852c54650746e65324514b (diff) | |
| download | gcc-c7207339a7dbce5b68f872064e624dcf1639ba46.zip gcc-c7207339a7dbce5b68f872064e624dcf1639ba46.tar.gz gcc-c7207339a7dbce5b68f872064e624dcf1639ba46.tar.bz2 | |
[ARM] Switch to default sched pressure algorithm
Currently the Arm backend selects the alternative sched pressure algorithm.
The issue is that this doesn't take register pressure into account, and so
it causes significant additional spilling on Arm where there are only 14
allocatable registers. Building SPEC2006 showed significant codesize gains
with the default pressure algorithm, so switch back to that. PR77308 shows
~800 fewer instructions.
SPECINT2006 is ~0.6% faster on Cortex-A57 together with the other DImode
patches. Overall SPEC codesize is 1.1% smaller.
gcc/
* config/arm/arm.c (arm_option_override): Don't override sched
pressure algorithm.
From-SVN: r276960
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/arm/arm.c | 5 |
2 files changed, 5 insertions, 5 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index c2cbd42..f07a0e6 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2019-10-14 Wilco Dijkstra <wdijkstr@arm.com> + + * config/arm/arm.c (arm_option_override): Don't override sched + pressure algorithm. + 2019-10-14 Richard Biener <rguenther@suse.de> PR tree-optimization/92069 diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index 39e1a1e..394b1dd 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -3555,11 +3555,6 @@ arm_option_override (void) global_options.x_param_values, global_options_set.x_param_values); - /* Use the alternative scheduling-pressure algorithm by default. */ - maybe_set_param_value (PARAM_SCHED_PRESSURE_ALGORITHM, SCHED_PRESSURE_MODEL, - global_options.x_param_values, - global_options_set.x_param_values); - /* Look through ready list and all of queue for instructions relevant for L2 auto-prefetcher. */ int param_sched_autopref_queue_depth; |