[Bug tree-optimization/66759] New: [6 Regression] ICE in generic-match.c on 456.hmmer

[miyuki at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66759

            Bug ID: 66759
           Summary: [6 Regression] ICE in generic-match.c on 456.hmmer
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: miyuki at gcc dot gnu.org
  Target Milestone: ---

$ cat weight.i
int a, b;
float c;
int fn2();
void fn1() {
  if (fn2() <= 1. - c)
    b = a;
}

$ cc1 -Ofast weight.i
weight.i: In function 'fn1':
weight.i:7:1: internal compiler error: Segmentation fault
 }
 ^
0xbb59ff crash_signal
        /home/jenkins/workspace/build-gcc-trunk/src/gcc/toplev.c:360
0x9414e3 tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
        /home/jenkins/workspace/build-gcc-trunk/src/gcc/tree.h:2980
0x9414e3 generic_simplify(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        /home/jenkins/workspace/build-gcc-trunk/build/gcc/generic-match.c:14669
0x823647 fold_binary_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        /home/jenkins/workspace/build-gcc-trunk/src/gcc/fold-const.c:9413
0x8319ea fold_build2_stat_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        /home/jenkins/workspace/build-gcc-trunk/src/gcc/fold-const.c:13378
0x823789 fold_binary_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        /home/jenkins/workspace/build-gcc-trunk/src/gcc/fold-const.c:9411
0xcdc36b combine_cond_expr_cond
        /home/jenkins/workspace/build-gcc-trunk/src/gcc/tree-ssa-forwprop.c:405
0xcdef80 forward_propagate_into_comparison_1
        /home/jenkins/workspace/build-gcc-trunk/src/gcc/tree-ssa-forwprop.c:478
0xce3cf2 forward_propagate_into_gimple_cond
        /home/jenkins/workspace/build-gcc-trunk/src/gcc/tree-ssa-forwprop.c:551
0xce3cf2 execute
       
/home/jenkins/workspace/build-gcc-trunk/src/gcc/tree-ssa-forwprop.c:2408
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

Started between r225351 and r225388.