Shouldn't i be initialized?
$ gcc-9 -Wuninitialized -O0 float.c # NO WARNINGS!!!
$ gcc-9 -O1 float.c # NO WARNINGS!!!
$ gcc-9 -Wuninitialized -O1 float.c
float.c: In function 'main':
float.c:9:5: warning: 'i' is used uninitialized in this function [-Wuninitialized]
9 | for (size_t i; i < (1ul << 33); i++) {
| ^~~ $ gcc hn.c -O0 -o hn
for (size_t i; i < (1ul<<46); i++) {
printf ("%zd\n",i);
acc += x;
break;
}
$ gcc hn.c -O0 -o hn
for (size_t i; i < (1ul<<46); i++) {
printf ("%zd\n",i);
acc += x;
}