This is in preparation for enabling proper handling of optnone under the
NPM. Most optimizations won't run on an optnone function.
Previously the test would rely on lots of optimizations to optimize the
IR into a simple infinite loop. This is an optnone function, so clearly
that shouldn't be the case.
This IR was found by printing the module before the LoopFullUnrollerPass ran.
Reviewed By: asbirlea
Differential Revision: https://reviews.llvm.org/D85578
There's no reason to introduce a new option for the NPM.
The various PGO options are shared in this manner.
Reviewed By: echristo
Differential Revision: https://reviews.llvm.org/D83368
Last we looked at this and couldn't come up with a reason to change
it, but with a pragma for full loop unrolling we bypass every other
loop unroll and then fail to fully unroll a loop when the pragma is set.
Move the OnlyWhenForced out of the check and into the initialization
of the full unroll pass in the new pass manager. This doesn't show up
with the old pass manager.
Add a new option to opt so that we can turn off loop unrolling
manually since this is a difference between clang and opt.
Tested with check-clang and check-llvm.
Arthur Eubanks