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author | Andre Vieira <andre.simoesdiasvieira@arm.com> | 2024-10-04 13:43:46 +0100 |
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committer | Andre Vieira <andre.simoesdiasvieira@arm.com> | 2024-10-04 13:46:13 +0100 |
commit | 7766a2c1eb683eeee352ce117e8ed014665f392f (patch) | |
tree | ff20e324233a150c9cb11f6648c813f25b7cfcb7 /libgfortran/generated | |
parent | 16cd00a10035992f52ed67ff77eab20039555b03 (diff) | |
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arm: Fix missed CE optimization for armv8.1-m.main [PR 116444]
This patch restores missed optimizations for armv8.1-m.main targets that were
missed when the generation of csinc, csinv and csneg were enabled for the same
with patch series containing:
commit c2bb84be4a6e581bbf45891457ee632a07416982
Author: Sudi Das <sudi.das@arm.com>
Date: Fri Sep 18 15:47:46 2020 +0100
[PATCH 2/5][Arm] New pattern for CSINV instructions
The original patch series makes use of the "noce" machinery to transform RTL
into patterns that later match the Armv8.1-M Mainline, by getting the target
hook TARGET_HAVE_CONDITIONAL_EXECUTION, to return FALSE for such targets prior
to reload_completed. The same machinery however was transforming other RTL
patterns which were later on causing the "ce" pass post reload_completed to no
longer optimize conditional execution opportunities, which was causing the
regression observed in PR target/116444, a regression of 'testsuite/gcc.target/arm/thumb-ifcvt-2.c'
when ran for an Armv8.1-M Mainline target.
This patch implements the target hook TARGET_NOCE_CONVERSION_PROFITABLE_P to
only allow "noce" to generate patterns that match CSINV, CSINC and CSNEG. Thus
ensuring that the early "ce" passes do not ruin things for later ones.
gcc/ChangeLog:
PR target/116444
* config/arm/arm-protos.h (arm_noce_conversion_profitable_p): New
declaration.
* config/arm/arm.cc (arm_is_v81m_cond_insn): New helper function used
in ...
(arm_noce_conversion_profitable_p): ... here. New function to implement
...
(TARGET_NOCE_PROFITABLE_P): ... this target hook. New define.
Diffstat (limited to 'libgfortran/generated')
0 files changed, 0 insertions, 0 deletions