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LaneMasks as given by getSubRegIndexLaneMask() have a limited number of of bits, so for targets with more than 31 disjunct subregister there may be cases where: getSubReg(Reg,A) does not overlap getSubReg(Reg,B) but we still have (getSubRegIndexLaneMask(A) & getSubRegIndexLaneMask(B)) != 0. I had hoped to keep this an implementation detail of the tablegen but as my next commit shows we can avoid unnecessary imp-defs operands if we know that the lane masks in use are precise. This is in preparation to http://reviews.llvm.org/D10470. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239837 91177308-0d34-0410-b5e6-96231b3b80d8
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