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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. Author: colpell Differential Revision: http://reviews.llvm.org/D21097 llvm-svn: 272266
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