[PATCH] D87786: [PPC][LoopUnrollAndJam] Allow unroll and jam loops forced by user.

[Whitney Tsang via Phabricator via llvm-commits]

Whitney added a comment.

In D87786#2277611 <https://reviews.llvm.org/D87786#2277611>, @Meinersbur wrote:

> Why is this specific to the PowerPC-backend. Doesn't the LoopUnrollAndJamPass pick-up the transformation metadata already?

When `-enable-npm-unroll-and-jam` is false (default), LoopUnrollAndJamPass doesn't unroll and jam any loops, no matter `UP.UnrollAndJam`  is true or not.
When `-enable-npm-unroll-and-jam` is true, LoopUnrollAndJamPass try to unroll and jam all loops with `UP.UnrollAndJam` set to true.

`UP.UnrollAndJam` is only set to true on ARM, or by option `allow-unroll-and-jam`.


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https://reviews.llvm.org/D87786