[PATCH] D154233: [ARM] generate correct code for armv6-m XO big stack operations

[Ties Stuij via Phabricator via llvm-commits]

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The ARM backend codebase is dotted with places where armv6-m will generate
constant pools. Now that we can generate execute-only code for armv6-m, we need
to make sure we use the movs/lsls/adds/lsls/adds/lsls/adds pattern instead of
these.

Big stacks is one of the obvious places. In this patch we take care of two
sites:

1. take care of big stacks in prologue/epilogue
2. take care of save/tSTRspi nodes, which implicitly fixes emitThumbRegPlusImmInReg which is used in several frame lowering fns


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154233

Files:
  llvm/lib/Target/ARM/ARMAsmPrinter.cpp
  llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
  llvm/lib/Target/ARM/ThumbRegisterInfo.cpp
  llvm/test/CodeGen/ARM/large-stack.ll

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