https://bugs.llvm.org/show_bug.cgi?id=40581
Bug ID: 40581
Summary: Loop flattening not performed?
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
https://godbolt.org/z/B3VM2A
void v0(int n, int *A, int *B) {
int k = 0;
for(int i = 0; i < n; i++)
for(int j = 0; j < n; j++) {
A[k] = B[k];
k++;
}
}
is equivalent to
void v1(int n, int *A, int *B) {
for(int i = 0; i < n; i++)
for(int j = 0; j < n; j++) {
int k = i*n+j;
A[k] = B[k];
k++;
}
}
(Also, which one of these ^ is better? clang does not optimize them into the
same IR)
Shouldn't that be transformed into
void v2(int n, int *A, int *B) {
for(int k = 0; k < n * n; k++)
A[k] = B[k];
}
?
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