https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114239
Bug ID: 114239
Summary: ice: error: definition in block does not dominate use
in block
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
For this C code:
int ip4_getbit_a, ip4_getbit_pos, ip4_clrbit_pos;
void ip4_clrbit(int *a) { *a &= ip4_clrbit_pos; }
typedef struct {
char pxlen;
int prefix
} net_addr_ip4;
void fib_get_chain();
int trie_match_longest_ip4();
int trie_match_next_longest_ip4(net_addr_ip4 *n) {
int __trans_tmp_1;
while (n->pxlen) {
n->pxlen--;
ip4_clrbit(&n->prefix);
__trans_tmp_1 = ip4_getbit_a >> ip4_getbit_pos;
if (__trans_tmp_1)
return 1;
}
return 0;
}
void net_roa_check_ip4_trie_tab() {
net_addr_ip4 px0;
for (int _n = trie_match_longest_ip4(&px0); _n;
_n = trie_match_next_longest_ip4(&px0))
fib_get_chain();
}
on x86_64, does this:
$ ../results/bin/gcc -c -O3 -march=znver3 -w ~/cvise/bug1021.c
/home/dcb38/cvise/bug1021.c: In function ‘net_roa_check_ip4_trie_tab’:
/home/dcb38/cvise/bug1021.c:20:6: error: definition in block 19 does not
dominate use in block 14
20 | void net_roa_check_ip4_trie_tab() {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
for SSA_NAME: _117 in statement:
px0__lsm.22_47 = PHI <_117(14), _117(19)>
PHI argument
_117
for PHI node
px0__lsm.22_47 = PHI <_117(14), _117(19)>
during GIMPLE pass: vect
/home/dcb38/cvise/bug1021.c:20:6: internal compiler error: verify_ssa failed
The bug first seems to occur sometime between g:1e74ce8983fd4926
and g:71244316cf714725, which is 42 commits.
