[PATCH] [Hexagon] Use constant extenders to fix up hardware loops

[Brendon Cahoon]

Hi sundeepk, colinl,

Use a loop instruction with a constant extender for a hardware loop instruction that is too far away from the start of the loop. This is cheaper than changing the SA register value.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9262

Files:
  lib/Target/Hexagon/HexagonFixupHwLoops.cpp
  lib/Target/Hexagon/HexagonInstrInfo.cpp
  lib/Target/Hexagon/HexagonInstrInfo.h
  lib/Target/Hexagon/HexagonOperands.td
  lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.cpp
  lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.h
  test/CodeGen/Hexagon/hwloop-range.ll

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