Hi,
Part 2, split off from https://gcc.gnu.org/ml/gcc-patches/2019-11/msg00399.html
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.
Bootstrapped on armhf. OK for commit?
ChangeLog:
2019-12-03 Wilco Dijkstra <wdijk...@arm.com>
* config/arm/arm.c (arm_option_override_internal):
Use max_cond_insns from CPU tuning unless -mrestrict-it is used.
--
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index
daebe76352d62ad94556762b4e3bc3d0532ad411..5ed9046988996e56f754c5588e4d25d5ecdd6b03
100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -3041,6 +3041,11 @@ 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.
