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d9c1fa5205
This restores my karma after I added TRI::getSubClassWithSubReg(). Register constraints are applied 'backwards'. Starting from the register class required by an instruction operand, the correct question is: 'How can I constrain the super-register register class so all its sub-registers satisfy the instruction constraint?' The getMatchingSuperRegClass() hook answers that. We never need to go 'forwards': Starting from a super-register register class, what register class are the sub-registers in? The getSubRegisterRegClass() hook did that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141258 91177308-0d34-0410-b5e6-96231b3b80d8
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