[Bug rtl-optimization/85300] [6 Regression] ICE in exact_int_to_float_conversion_p, at simplify-rtx.c:895

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85300

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Jun 25 17:47:56 2018
New Revision: 262096

URL: https://gcc.gnu.org/viewcvs?rev=262096&root=gcc&view=rev
Log:
        Backported from mainline
        2018-04-10  Jakub Jelinek  <jakub@redhat.com>

        PR rtl-optimization/85300
        * combine.c (subst): Handle subst of CONST_SCALAR_INT_P new_rtx also
        into FLOAT and UNSIGNED_FLOAT like ZERO_EXTEND, return a CLOBBER if
        simplify_unary_operation fails.

        * gcc.dg/pr85300.c: New test.

Added:
    branches/gcc-6-branch/gcc/testsuite/gcc.dg/pr85300.c
Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/combine.c
    branches/gcc-6-branch/gcc/testsuite/ChangeLog