[Bug c/83844] [8 Regression] ICE with warn_if_not_aligned attribute

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83844

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Jan 16 15:08:32 2018
New Revision: 256745

URL: https://gcc.gnu.org/viewcvs?rev=256745&root=gcc&view=rev
Log:
        PR c/83844
        * stor-layout.c (handle_warn_if_not_align): Use byte_position and
        multiple_of_p instead of unchecked tree_to_uhwi and UHWI check.
        If off is not INTEGER_CST, issue a may not be aligned warning
        rather than isn't aligned.  Use isn%'t rather than isn't.
        * fold-const.c (multiple_of_p) <case BIT_AND_EXPR>: Don't fall through
        into MULT_EXPR.
        <case MULT_EXPR>: Improve the case when bottom and one of the
        MULT_EXPR operands are INTEGER_CSTs and bottom is multiple of that
        operand, in that case check if the other operand is multiple of
        bottom divided by the INTEGER_CST operand.

        * gcc.dg/pr83844.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr83844.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/stor-layout.c
    trunk/gcc/testsuite/ChangeLog