https://bugs.llvm.org/show_bug.cgi?id=37428
Sanjay Patel <spatel+l...@rotateright.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Fixed By Commit(s)| |r363511
Status|NEW |RESOLVED
--- Comment #13 from Sanjay Patel <spatel+l...@rotateright.com> ---
I think we've solved all of the vector shift bugs in these examples with:
https://reviews.llvm.org/rL363511
...so I'm going to mark this as fixed. Feel free to reopen if I missed
anything.
AVX1 is still sub-optimal even after:
https://reviews.llvm.org/rL363508
I'll investigate that as a follow-up, but I see 2 potential symptoms depending
on the example:
1. We unrolled too much and ran out of registers, so we're spilling.
2. We failed to expand/hoist all of the vector shifts when fully unrolled.
Root cause may be cost model/unrolling. Ie, I don't see these problems if I use
"-fno-unroll-loops" (and perf improves with that setting).
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