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006958b5ff
We failed to account for the target register width (max vector factor) when vectorizing starting from GEPs. This causes vectorization to proceed to obviously illegal widths as in: https://bugs.llvm.org/show_bug.cgi?id=43578 For x86, this also means that SLP can produce rogue AVX or AVX512 code even when the user specifies a narrower vector width. The AArch64 test in ext-trunc.ll appears to be better using the narrower width. I'm not exactly sure what getelementptr.ll is trying to do, but it's testing with "-slp-threshold=-18", so I'm not worried about those diffs. The x86 test is an over-reduction from SPEC h264; this patch appears to restore the perf loss caused by SLP when using -march=haswell. Differential Revision: https://reviews.llvm.org/D68667 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374183 91177308-0d34-0410-b5e6-96231b3b80d8