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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2017-06-28 14:13:02 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco@gcc.gnu.org> | 2017-06-28 14:13:02 +0000 |
| commit | 55994b971b02a3808f3776ce66e890ecc1c7b759 (patch) | |
| tree | dff29e7e29c7b161ca55e3d7bcf2469727c7c2f0 /gcc/fold-const.c | |
| parent | 926c786507a69f31253d6c904cf582b9ba162ded (diff) | |
| download | gcc-55994b971b02a3808f3776ce66e890ecc1c7b759.zip gcc-55994b971b02a3808f3776ce66e890ecc1c7b759.tar.gz gcc-55994b971b02a3808f3776ce66e890ecc1c7b759.tar.bz2 | |
Improve Cortex-A53 shift bypass
The aarch_forward_to_shift_is_not_shifted_reg bypass always returns true
on AArch64 shifted instructions. This causes the bypass to activate in
too many cases, resulting in slower execution on Cortex-A53 like reported
in PR79665.
This patch uses the arm_no_early_alu_shift_dep condition instead which
improves the example in PR79665 by ~7%. Given it is no longer used,
remove aarch_forward_to_shift_is_not_shifted_reg. Also remove an
unnecessary REG_P check.
gcc/
PR target/79665
* config/arm/aarch-common.c (arm_no_early_alu_shift_dep):
Remove redundant if.
(aarch_forward_to_shift_is_not_shifted_reg): Remove.
* config/arm/aarch-common-protos.h
(aarch_forward_to_shift_is_not_shifted_re): Remove.
* config/arm/cortex-a53.md: Use arm_no_early_alu_shift_dep in bypass.
From-SVN: r249740
Diffstat (limited to 'gcc/fold-const.c')
0 files changed, 0 insertions, 0 deletions