[Bug target/58779] [4.7/4.8/4.9 Regression] wrong code at -O1 on x86_64-linux-gnu

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58779

--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 31067
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31067&action=edit
Proposed patch that removes MINUS overflow checks

Patch in testing.