[Bug tree-optimization/95717] New: ICE during GIMPLE pass: vect: verify_ssa failed

vsevolod.livinskij at frtk dot ru gcc-bugzilla@gcc.gnu.org
Wed Jun 17 06:59:58 GMT 2020


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95717

            Bug ID: 95717
           Summary: ICE during GIMPLE pass: vect: verify_ssa failed
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vsevolod.livinskij at frtk dot ru
  Target Milestone: ---

Error:
$ g++ -c -O3 func.cpp
func.cpp: In function ‘void g(bool)’:
func.cpp:5:6: error: definition in block 61 does not dominate use in block 59
    5 | void g(bool h) {
      |      ^
for SSA_NAME: prephitmp_100 in statement:
prephitmp_100 = PHI <prephitmp_100(59), _103(62)>
PHI argument
prephitmp_100
for PHI node
prephitmp_100 = PHI <prephitmp_100(59), _103(62)>
during GIMPLE pass: vect
func.cpp:5:6: internal compiler error: verify_ssa failed
0x13368a2 verify_ssa(bool, bool)
        gcc/tree-ssa.c:1208
0x10228a5 execute_function_todo
        gcc/passes.c:1992
0x102357e execute_todo
        gcc/passes.c:2039

Reproducer:
bool a;
extern bool b[];
long c, d;
int *f;
void g(bool h) {
  for (short e = 0; e < c; e = 4)
    for (; d; d++)
      b[d] = a = f[d] ? c ? h : 0 : h;
}

GCC version:
gcc version 11.0.0 (56638b9b1853666f575928f8baf17f70e4ed3517)


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