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Set default sched pressure algorithm

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The Arm backend sets the default sched-pressure algorithm to SCHED_PRESSURE_MODEL.
Benchmarking on AArch64 shows this speeds up floating point performance on SPEC -
eg. CactusBSSN improves by ~16%.  The gains are mostly due to less spilling,
so enable this on AArch64 by default.

    gcc/
	* config/aarch64/aarch64.c (aarch64_override_options_internal):
	Set PARAM_SCHED_PRESSURE_ALGORITHM to SCHED_PRESSURE_MODEL.

From-SVN: r254378
This commit is contained in:
Wilco Dijkstra 2017-11-03 15:20:53 +00:00 committed by Wilco Dijkstra
parent 13e4f305e0
commit 13494fcb36
2 changed files with 10 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2017-11-03 Wilco Dijkstra <wdijkstr@arm.com>
* config/aarch64/aarch64.c (aarch64_override_options_internal):
Set PARAM_SCHED_PRESSURE_ALGORITHM to SCHED_PRESSURE_MODEL.
2017-11-03 Kito Cheng <kito.cheng@gmail.com>
* config/riscv/riscv.c (riscv_legitimize_move): Handle

5
gcc/config/aarch64/aarch64.c
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@ -9110,6 +9110,11 @@ aarch64_override_options_internal (struct gcc_options *opts)
opts->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,
opts->x_param_values,
global_options_set.x_param_values);
/* Enable sw prefetching at specified optimization level for
CPUS that have prefetch. Lower optimization level threshold by 1
when profiling is enabled. */