823f9ebaa3
subreg_hireg of register pair Rp. * lib/Target/Hexagon/HexagonPeephole.cpp(PeepholeDoubleRegsMap): New DenseMap similar to PeepholeMap that additionally records subreg info too. (runOnMachineFunction): Record information in PeepholeDoubleRegsMap and copy propagate the high sub-reg of Rp0 in Rp1 = lsr(Rp0, #32) to the instruction Rx = COPY Rp1:logreg_subreg. * test/CodeGen/Hexagon/remove_lsr.ll: New test. llvm-svn: 163214 |
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