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e328c5ea83
support for MOVDDUP which is really important for matrix multiply style operations that do lots of non-vector-aligned load and splats. The original motivation was to add support for MOVDDUP as the lack of it regresses matmul_f64_4x4 by 5% or so. However, all of the rules here were somewhat suspicious. First, we should always be using the floating point domain shuffles, regardless of how many copies we have to make as a movapd is *crazy* faster than the domain switching cost on some chips. (Mostly because movapd is crazy cheap.) Because SHUFPD can't do the copy-for-free trick of the PSHUF instructions, there is no need to avoid canonicalizing on UNPCK variants, so do that canonicalizing. This also ensures we have the chance to form MOVDDUP. =] Second, we assume SSE2 support when doing any vector lowering, and given that we should just use UNPCKLPD and UNPCKHPD as they can operate on registers or memory. If vectors get spilled or come from memory at all this is going to allow the load to be folded into the operation. If we want to optimize for encoding size (the only difference, and only a 2 byte difference) it should be done *much* later, likely after RA. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217332 91177308-0d34-0410-b5e6-96231b3b80d8 |
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