[Bug middle-end/85974] [8 Regression] Failure to optimize difference of two pointers into a compile time constant

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85974

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Jul 16 11:01:48 2018
New Revision: 262690

URL: https://gcc.gnu.org/viewcvs?rev=262690&root=gcc&view=rev
Log:
2018-07-16  Richard Biener  <rguenther@suse.de>

        Backport from mainline
        2018-07-13  Richard Biener  <rguenther@suse.de>

        PR middle-end/85974
        * match.pd (addr1 - addr2): Allow either of the operand to
        have a conversion.

        * gcc.c-torture/compile/930326-1.c: Adjust to cover widening.

        2018-06-15  Richard Biener  <rguenther@suse.de>

        PR middle-end/86076
        * tree-cfg.c (move_stmt_op): unshare invariant addresses
        before adjusting their block.

        * gcc.dg/pr86076.c: New testcase.

        2018-06-06  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/85935
        * graphite-scop-detection.c (find_params_in_bb): Analyze
        condition operands with respect to the correct loop.  Assert
        the analysis doesn't fail.

        * gcc.dg/graphite/pr85935.c: New testcase.

Added:
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/graphite/pr85935.c
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/pr86076.c
Modified:
    branches/gcc-8-branch/gcc/ChangeLog
    branches/gcc-8-branch/gcc/graphite-scop-detection.c
    branches/gcc-8-branch/gcc/match.pd
    branches/gcc-8-branch/gcc/testsuite/ChangeLog
    branches/gcc-8-branch/gcc/testsuite/gcc.c-torture/compile/930326-1.c
    branches/gcc-8-branch/gcc/tree-cfg.c