[Bug tree-optimization/87314] pointless comparison of malloc result to a string not eliminated

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87314

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri May  3 10:44:17 2019
New Revision: 270845

URL: https://gcc.gnu.org/viewcvs?rev=270845&root=gcc&view=rev
Log:
2019-05-03  Richard Biener  <rguent...@suse.de>

        PR middle-end/87314
        * match.pd (cmp (convert1?@2 addr@0) (convert2? addr@1)):
        Handle STRING_CST vs DECL or STRING_CST.

        * gcc.dg/pr87314-1.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/pr87314-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog