On Thu, Nov 02, 2017 at 06:41:58PM +0000, Wilco Dijkstra wrote: > 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. > > OK for commit?
OK. Reviewed-By: James Greenhalgh <james.greenha...@arm.com> Thanks, James > > 2017-11-02 Wilco Dijkstra <wdijk...@arm.com> > > * config/aarch64/aarch64.c (aarch64_override_options_internal): > Set PARAM_SCHED_PRESSURE_ALGORITHM to SCHED_PRESSURE_MODEL. > > -- > diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c > index > 34456e96497ac7b6d2f9931187ff05619e1934a4..750b0bc29c0963742d5d7bb4ae4619d93bec3e4a > 100644 > --- a/gcc/config/aarch64/aarch64.c > +++ b/gcc/config/aarch64/aarch64.c > @@ -9276,6 +9276,11 @@ 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. */
