[Bug tree-optimization/86428] strlen of const array initialized with a string of the same length not folded
msebor at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Mon Jul 9 20:34:00 GMT 2018
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86428
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Mon Jul 9 20:33:48 2018
New Revision: 262522
URL: https://gcc.gnu.org/viewcvs?rev=262522&root=gcc&view=rev
Log:
PR middle-end/77357 - strlen of constant strings not folded
gcc/ChangeLog:
PR middle-end/77357
PR middle-end/86428
* builtins.c (c_strlen): Avoid out-of-bounds warnings when
accessing implicitly initialized array elements.
* expr.c (string_constant): Handle string initializers of
character arrays within aggregates.
* gimple-fold.c (fold_array_ctor_reference): Add argument.
Store element offset. As a special case, handle zero size.
(fold_nonarray_ctor_reference): Same.
(fold_ctor_reference): Add argument. Store subobject offset.
* gimple-fold.h (fold_ctor_reference): Add argument.
gcc/testsuite/ChangeLog:
PR middle-end/77357
* gcc.dg/strlenopt-49.c: New test.
* gcc.dg/strlenopt-50.c: New test.
* gcc.dg/strlenopt-51.c: New test.
* gcc.dg/strlenopt-52.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/strlenopt-49.c
trunk/gcc/testsuite/gcc.dg/strlenopt-50.c
trunk/gcc/testsuite/gcc.dg/strlenopt-51.c
trunk/gcc/testsuite/gcc.dg/strlenopt-52.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/builtins.c
trunk/gcc/expr.c
trunk/gcc/fold-const.c
trunk/gcc/fold-const.h
trunk/gcc/gimple-fold.c
trunk/gcc/gimple-fold.h
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.c-torture/execute/builtins/strlen-3.c
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