https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118298
Bug ID: 118298
Summary: Partial unroll request for outer loop with #pragma GCC
unroll is silently ignored
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: tiborgyri at gmail dot com
CC: tiborgyri at gmail dot com
Target Milestone: ---
See: https://godbolt.org/z/Mc9fsW4s5
The outer loop in this example has a trip count of 6, and I am asking GCC to
unroll it by a factor of 2. GCC silently ignores the pragma, while clang does
what I expect and unrolls it to trip count of 3.
GCC should also honor this pragma, or if it cannot, it should at least leave a
note in the optimization report or stdout.
