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265d201e19
This change further evolves the base class AVX512_masking in order to make it suitable for the masking variants of the FMA instructions. Besides AVX512_masking there is now a new base class that instructions including FMAs can use: AVX512_masking_3src. With three-source (destructive) instructions one of the sources is already tied to the destination. This difference from AVX512_masking is captured by this new class. The common bits between _masking and _masking_3src are broken out into a new super class called AVX512_masking_common. As with valign, there is some corresponding restructuring of the underlying format classes. The idea is the same we want to derive from two classes essentially: one providing the format bits and another format-independent multiclass supplying the various masking and non-masking instruction variants. Existing fma tests in avx512-fma*.ll provide coverage here for the non-masking variants. For masking, the next patches in the series will add intrinsics and intrinsic tests. For AVX512_masking_3src to work, the (ins ...) dag has to be passed *without* the leading source operand that is tied to dst ($src1). This is necessary to properly construct the (ins ...) for the different variants. For the record, I did check that if $src is mistakenly included, you do get a fairly intuitive error message from the tablegen backend. Part of <rdar://problem/17688758> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215660 91177308-0d34-0410-b5e6-96231b3b80d8 |
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