[Bug tree-optimization/87546] [9 Regression] Gcc miscompiles at -O3 on valid code

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87546

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sat Nov 17 15:10:48 2018
New Revision: 266237

URL: https://gcc.gnu.org/viewcvs?rev=266237&root=gcc&view=rev
Log:
        PR tree-optimization/87546
        * tree-vect-patterns.c (vect_look_through_possible_promotion): Add
        min_precision variable, initially set it to orig_precision, only does
        something if op_type's precision is <= min_precision and update
        min_precision whenever calling set_op.

        * gcc.dg/vect/O3-pr87546.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/vect/O3-pr87546.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-patterns.c