https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97077
Bug ID: 97077
Summary: Missed loop unrolling with range for over initializer
list
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bmburstein at gmail dot com
Target Milestone: ---
In the following code:
#include <initializer_list>
int foo(int);
int main() {
for(int i=0; i<5; ++i) {
foo(i);
}
for(int i : {0,1,2,3,4}) {
foo(i);
}
}
The 2 loops should probably produce identical output. However, the output I see
here https://godbolt.org/z/z1We36 (using the trunk from 2020-09-15) shows that
the first loop (the traditional one) is indeed unrolled as expected, but the
second one is not.
