[PATCH] D21097: Enable long displacement constraints for inline ASM operands on SystemZ

[Elliot Colp via llvm-commits]

colpell created this revision.
colpell added a reviewer: uweigand.
colpell added a subscriber: llvm-commits.

This enables use of the 'S' constraint for inline ASM operands on SystemZ, which allows for a memory reference with a signed 20-bit immediate displacement. This patch includes corresponding documentation and test case updates.

I've changed the 'T' constraint to match the new behavior for 'S', as 'T' also uses a long displacement (though index constraints are still not implemented). I also changed 'm' to match the behavior for 'S' as this will allow for a wider range of displacements for 'm', though correct me if that's not the right decision.

http://reviews.llvm.org/D21097

Files:
  docs/LangRef.rst
  lib/Target/SystemZ/README.txt
  lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
  test/CodeGen/SystemZ/asm-03.ll
  test/CodeGen/SystemZ/asm-04.ll
  test/CodeGen/SystemZ/asm-05.ll

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