[ARM] signed zero

Nathan Sidwell nathan@codesourcery.com
Mon May 23 14:05:00 GMT 2011

This patch fixes issues with signed zero offsets in the arm assembler and 

The ARM ISA encodes offsets in sign/magnitude representation, so there are two 
representations of zero.  The ISA specifies how the assembler should select the 
right one, and the disassembler should explicitly show -0.  For +0, it should 
elide the offset in certain circumstances.

This patch fixes up things so that, for instance
	ldr  r0,[r1,#-0]
is encoded correctly.

tested on arm-eabi, ok?

Nathan Sidwell

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