[Bug rtl-optimization/85862] infinite loop in find_base_term()

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85862

--- Comment #1 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
---
Author: rsandifo
Date: Tue May 22 12:25:44 2018
New Revision: 260504

URL: https://gcc.gnu.org/viewcvs?rev=260504&root=gcc&view=rev
Log:
Handle a null lhs in expand_direct_optab_fn (PR85862)

This PR showed that the normal function for expanding directly-mapped
internal functions didn't handle the case in which the call was only
being kept for its side-effects.

2018-05-22  Richard Sandiford  <richard.sandif...@linaro.org>

gcc/
        PR middle-end/85862
        * internal-fn.c (expand_direct_optab_fn): Cope with a null lhs.

gcc/testsuite/
        PR middle-end/85862
        * gcc.dg/torture/pr85862.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr85862.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/internal-fn.c
    trunk/gcc/testsuite/ChangeLog