[PATCH] D11649: [regalloc] Make RegMask clobbers prevent merging vreg's into PhysRegs when hoisting def's upwards.

[Daniel Sanders]

dsanders added a comment.

One worrying discovery I made while debugging this is that MachineInstr::definesRegister(Mips::http://reviews.llvm.org/D7) doesn't return true for the JAL instruction mentioned in the summary. It seems it doesn't consider regmasks to be defs of the clobbered registers. Is this intentional?


http://reviews.llvm.org/D11649