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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2019-12-04 15:40:41 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco@gcc.gnu.org> | 2019-12-04 15:40:41 +0000 |
| commit | b3e3b9000be5f6636096d63444a2d62260f7cbec (patch) | |
| tree | 805a29e1b44291cb8264c612c7fcb192b3860740 /gcc | |
| parent | 09a214ac6bea2a7148e0694b6b1ab61e02485a53 (diff) | |
| download | gcc-b3e3b9000be5f6636096d63444a2d62260f7cbec.zip gcc-b3e3b9000be5f6636096d63444a2d62260f7cbec.tar.gz gcc-b3e3b9000be5f6636096d63444a2d62260f7cbec.tar.bz2 | |
[ARM] Improve max_cond_insns setting for Cortex cores
To enable cores to use the correct max_cond_insns setting, use the core-specific
tuning when a CPU/tune is selected unless -mrestrict-it is explicitly set.
On Cortex-A57 this gives 1.1% performance gain on SPECINT2006 as well as a
0.4% codesize reduction.
gcc/
* config/arm/arm.c (arm_option_override_internal):
Use max_cond_insns from CPU tuning unless -mrestrict-it is used.
From-SVN: r278968
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/arm/arm.c | 5 |
2 files changed, 10 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3d59aea..eab3089 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2019-12-04 Wilco Dijkstra <wdijkstr@arm.com> + * config/arm/arm.c (arm_option_override_internal): + Use max_cond_insns from CPU tuning unless -mrestrict-it is used. + +2019-12-04 Wilco Dijkstra <wdijkstr@arm.com> + * config/aarch64/aarch64.c (thunderxt88_tunings): Use AARCH64_FUSE_ALU_BRANCH. (thunderx_tunings): Likewise. diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index a6b401b..6eb2afb 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -3044,6 +3044,11 @@ arm_option_override_internal (struct gcc_options *opts, if (!TARGET_THUMB2_P (opts->x_target_flags) || !arm_arch_notm) opts->x_arm_restrict_it = 0; + /* Use the IT size from CPU specific tuning unless -mrestrict-it is used. */ + if (!opts_set->x_arm_restrict_it + && (opts_set->x_arm_cpu_string || opts_set->x_arm_tune_string)) + opts->x_arm_restrict_it = 0; + /* Enable -munaligned-access by default for - all ARMv6 architecture-based processors when compiling for a 32-bit ISA i.e. Thumb2 and ARM state only. |