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927a5f45e0
re-combining shuffles because nothing was available in the wider vector type. The key observation (which I've put in the comments for future maintainers) is that at this point, no further combining is really possible. And so even though these shuffles trivially could be combined, we need to actually do that as we produce them when producing them this late in the lowering. This fixes another (huge) part of the Halide vector shuffle regressions. As it happens, this was already well covered by the tests, but I hadn't noticed how bad some of these got. The specific patterns that turn directly into unpckl/h patterns were occurring *many* times in common vector processing code. There are still more problems here sadly, but trying to incrementally tease them apart and it looks like this is the core of the problem in the splitting logic. There is some chance of regression here, you can see it in the test changes. Specifically, where we stop forming pshufb in some cases, it is possible that pshufb was in fact faster. Intel "says" that pshufb is slower than the instruction sequences replacing it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221852 91177308-0d34-0410-b5e6-96231b3b80d8 |
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