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Internally, the PowerPC backend names the 32-bit GPRs R[0-9]+, and names the 64-bit parent GPRs X[0-9]+. When matching inline assembly constraints with explicit register names, on PPC64 when an i64 MVT has been requested, we need to follow gcc's convention of using r[0-9]+ to refer to the 64-bit (parent) registers. At some point, we'll probably want to arrange things so that the generic code in TargetLowering uses the AsmName fields declared in *RegisterInfo.td in order to match these inline asm register constraints. If we do that, this change can be reverted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187693 91177308-0d34-0410-b5e6-96231b3b80d8
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