[Bug middle-end/84309] [8 Regression] Wrong-code with -ffast-math

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84309

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Feb 13 20:22:50 2018
New Revision: 257634

URL: https://gcc.gnu.org/viewcvs?rev=257634&root=gcc&view=rev
Log:
        PR middle-end/84309
        * match.pd (pow(C,x) -> exp(log(C)*x)): Use exp2s and log2s instead
        of exps and logs in the use_exp2 case.

        * gcc.dg/pr84309-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr84309-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog