[PATCH] D21177: [Thumb-1] Select post-increment load and store where possible

[James Molloy via llvm-commits]

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Thumb-1 doesn't have post-inc or pre-inc load or store instructions. However the LDM/STM instructions with writeback can function as post-inc load/store:

      ldm r0!, {r1}  @ load from r0 into r1 and increment r0 by 4

Obviously, this only works if the post increment is 4.

Repository:
  rL LLVM

http://reviews.llvm.org/D21177

Files:
  lib/Target/ARM/ARMISelDAGToDAG.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMInstrThumb.td
  test/CodeGen/Thumb/ldm-stm-postinc.ll

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