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42865588d7
NEON loads and stores accept single and double spaced pairs, triples, and quads of D registers. This patch adds new register classes to accurately model those constraints: Dn, Dn+1 Dn, Dn+2 ---------------------- DPair DPairSpc DTriple DTripleSpc DQuad DQuadSpc Also extend the existing QQ and QQQQ register classes to contains all Q pairs and quads instead of just the aligned ones. These new register classes will make it possible to accurately model constraints on NEON loads and stores, and we can get rid of all the NEON pseudo-instructions. The late scheduler will be able to accurately model instruction dependencies from the explicit operands. This more than doubles the number of ARM registers, but the backend passes are quite good at handling this. The llc -O0 compile time only regresses by 1.5%. Future work on register mask operands will recover this regression. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149640 91177308-0d34-0410-b5e6-96231b3b80d8