[Bug tree-optimization/83821] local aggregate initialization defeats strlen optimization
msebor at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Oct 16 19:25:00 GMT 2019
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83821
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Oct 16 19:24:36 2019
New Revision: 277080
URL: https://gcc.gnu.org/viewcvs?rev=277080&root=gcc&view=rev
Log:
PR tree-optimization/83821 - local aggregate initialization defeats strlen
optimization
gcc/ChangeLog:
PR tree-optimization/83821
* tree-ssa-strlen.c (maybe_invalidate): Add argument. Consider
the length of a string when available.
(handle_builtin_memset) Add argument.
(handle_store, strlen_check_and_optimize_call): Same.
(check_and_optimize_stmt): Same. Pass it to callees.
gcc/testsuite/ChangeLog:
PR tree-optimization/83821
* c-c++-common/Warray-bounds-4.c: Remove XFAIL.
* gcc.dg/strlenopt-82.c: New test.
* gcc.dg/strlenopt-83.c: Same.
* gcc.dg/strlenopt-84.c: Same.
* gcc.dg/strlenopt-85.c: Same.
* gcc.dg/strlenopt-86.c: Same.
* gcc.dg/tree-ssa/calloc-4.c: Same.
* gcc.dg/tree-ssa/calloc-5.c: Same.
Added:
trunk/gcc/testsuite/gcc.dg/strlenopt-82.c
trunk/gcc/testsuite/gcc.dg/strlenopt-83.c
trunk/gcc/testsuite/gcc.dg/strlenopt-84.c
trunk/gcc/testsuite/gcc.dg/strlenopt-85.c
trunk/gcc/testsuite/gcc.dg/strlenopt-86.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/calloc-4.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/calloc-5.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/c-c++-common/Warray-bounds-4.c
trunk/gcc/tree-ssa-strlen.c
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