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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/95852] Failure to optimize __builtin_mul_overflow pattern
Date: Mon, 11 Jan 2021 09:36:37 +0000 [thread overview]
Message-ID: <bug-95852-4-nK5GRY5540@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-95852-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95852
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:a2106317cd6673e110b347c70f21e25fbb23379e
commit r11-6579-ga2106317cd6673e110b347c70f21e25fbb23379e
Author: Jakub Jelinek <jakub@redhat.com>
Date: Mon Jan 11 10:32:07 2021 +0100
widening_mul: Pattern recognize unsigned multiplication with overflow check
[PR95852]
The following patch pattern recognizes some forms of multiplication
followed
by overflow check through division by one of the operands compared to the
other one, with optional removal of guarding non-zero check for that
operand
if possible. The patterns are replaced with effectively
__builtin_mul_overflow or __builtin_mul_overflow_p. The testcases cover 64
different forms of that.
2021-01-11 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/95852
* tree-ssa-math-opts.c (maybe_optimize_guarding_check): New
function.
(uaddsub_overflow_check_p): Renamed to ...
(arith_overflow_check_p): ... this. Handle also multiplication
with overflow check.
(match_uaddsub_overflow): Renamed to ...
(match_arith_overflow): ... this. Add cfg_changed argument.
Handle
also multiplication with overflow check. Adjust function comment.
(math_opts_dom_walker::after_dom_children): Adjust callers. Call
match_arith_overflow also for MULT_EXPR.
* gcc.target/i386/pr95852-1.c: New test.
* gcc.target/i386/pr95852-2.c: New test.
next prev parent reply other threads:[~2021-01-11 9:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 21:50 [Bug tree-optimization/95852] New: " gabravier at gmail dot com
2021-01-07 19:26 ` [Bug tree-optimization/95852] " jakub at gcc dot gnu.org
2021-01-08 13:45 ` jakub at gcc dot gnu.org
2021-01-11 9:36 ` cvs-commit at gcc dot gnu.org [this message]
2021-01-11 9:36 ` cvs-commit at gcc dot gnu.org
2021-01-11 9:37 ` jakub at gcc dot gnu.org
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