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* [ARM] Shrink post-indexed LDR and STR to LDM/STMJames Molloy2016-06-071-0/+52
A Thumb-2 post-indexed LDR instruction such as: ldr.w r0, [r1], #4 Can be rewritten as: ldm.n r1!, {r0} LDMs can be more expensive than LDRs on some cores, so this has been enabled only in minsize mode. llvm-svn: 272002
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