[Bug tree-optimization/96670] New: [11 Regression] ICE in tree_to_uhwi, at tree.c:7361 since r11-2709-g866626efd749ed3e

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96670

            Bug ID: 96670
           Summary: [11 Regression] ICE in tree_to_uhwi, at tree.c:7361
                    since r11-2709-g866626efd749ed3e
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: msebor at gcc dot gnu.org
  Target Milestone: ---

The following is causing ICE:

$ cat memchr.c
struct {
  int n;
  short a;
} const sx = {};


void
test_not_find() {
  int nb = (char *)&sx.a - (char *)&sx;
  char *p = (char *)&sx;
  __builtin_memchr(p, 5, nb);
}

$ gcc memchr.c -Os -fno-tree-ccp -c
during GIMPLE pass: forwprop
memchr.c: In function ‘test_not_find’:
memchr.c:12:1: internal compiler error: in tree_to_uhwi, at tree.c:7361
   12 | }
      | ^
0x72c3b3 tree_to_uhwi(tree_node const*)
        /home/marxin/Programming/gcc/gcc/tree.c:7361
0x72c3b3 tree_to_uhwi(tree_node const*)
        /home/marxin/Programming/gcc/gcc/tree.c:7359
0xacad32 gimple_fold_builtin_memchr
        /home/marxin/Programming/gcc/gcc/gimple-fold.c:2678
0xad7f8b gimple_fold_builtin
        /home/marxin/Programming/gcc/gcc/gimple-fold.c:4018
0xad7f8b gimple_fold_call
        /home/marxin/Programming/gcc/gcc/gimple-fold.c:4531
0xad8d03 fold_stmt_1
        /home/marxin/Programming/gcc/gcc/gimple-fold.c:5232
0xea600c execute
        /home/marxin/Programming/gcc/gcc/tree-ssa-forwprop.c:3103
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Please include the complete backtrace with any bug report.
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