[PATCH] D21991: [libunwind][ARM] Improve unwinder stack usage - Make WMMX support optional

[Asiri Rathnayake via cfe-commits]

rmaprath created this revision.
rmaprath added reviewers: jroelofs, bcraig.
rmaprath added a subscriber: cfe-commits.
Herald added subscribers: rengolin, aemerson.

These registers are only available on a limited set of ARM targets (those based on XScale). Other targets should not have to pay the cost of these.

This patch shaves off about ~300 bytes of stack usage and ~1KB of code-size.

http://reviews.llvm.org/D21991

Files:
  CMakeLists.txt
  include/__libunwind_config.h
  src/Registers.hpp
  src/Unwind-EHABI.cpp
  src/UnwindRegistersRestore.S
  src/UnwindRegistersSave.S

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