[Bug tree-optimization/79666] [5/6/7 Regression] wrong code (SIGFPE) at -O2 on x86_64-linux-gnu (in both 32-bit and 64-bit modes)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79666

--- Comment #6 from Richard Biener  ---
Author: rguenth
Date: Wed Feb 22 12:11:27 2017
New Revision: 245648

URL: https://gcc.gnu.org/viewcvs?rev=245648=gcc=rev
Log:
2017-02-22  Richard Biener  

PR tree-optimization/79666
* tree-vrp.c (extract_range_from_binary_expr_1): Make sure
to not symbolically negate if that may introduce undefined
overflow.

* gcc.dg/torture/pr79666.c: New testcase.

Added:
trunk/gcc/testsuite/gcc.dg/torture/pr79666.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vrp.c

[Bug tree-optimization/79666] [5/6/7 Regression] wrong code (SIGFPE) at -O2 on x86_64-linux-gnu (in both 32-bit and 64-bit modes)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79666

Richard Biener  changed:

   What|Removed |Added

   Target Milestone|7.0 |5.5
Summary|[7 Regression] wrong code   |[5/6/7 Regression] wrong
   |(SIGFPE) at -O2 on  |code (SIGFPE) at -O2 on
   |x86_64-linux-gnu (in both   |x86_64-linux-gnu (in both
   |32-bit and 64-bit modes)|32-bit and 64-bit modes)

--- Comment #5 from Richard Biener  ---
That symbolic expression building exists in GCC 5.  Testing patch.