https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126486
Bug ID: 126486
Summary: codesize regression by 17.6and potential miss
optimziation cauded by r15-6657
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: liuhongt at gcc dot gnu.org
Target Milestone: ---
testcase
```c
int g(int N_dims, int *actual_indices, const long *input_array_dims, int
max_iter) {
int sum = 0, iter = 0, k, j, product;
while (iter < max_iter) {
sum = actual_indices[0];
for (k = N_dims-1; k > 0; k--) {
product = 1;
for (j = k-1; j >= 0; j--)
product *= input_array_dims[j];
sum += actual_indices[k] * product;
}
iter++;
}
return sum;
}
```
Compile: `gcc -O2 -march=x86-64-v3 -c pr-testcase.c` (the `-march` is not
required;
plain `-O2` reproduces too).
