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Author SHA1 Message Date
Renato Golin 92c816c68f Thumb2 M-class MSR instruction support changes 
This patch implements a few changes related to the Thumb2 M-class MSR instruction:
 * better handling of unpredictable encodings,
 * recognition of the _g and _nzcvqg variants by the asm parser only if the DSP
   extension is available, preferred output of MSR APSR moves with the _<bits>
   suffix for v7-M.

Patch by Petr Pavlu.

llvm-svn: 216874
 2014-09-01 11:25:07 +00:00
James Molloy 137ce60ecf Allow only disassembling of M-class MSR masks that the assembler knows how to assemble back. 
Note: The current code in DecodeMSRMask() rejects the unpredictable A/R MSR mask '0000' with Fail. The code in the patch follows this style and rejects unpredictable M-class MSR masks also with Fail (instead of SoftFail). If SoftFail is preferred in this case then additional changes to ARMInstPrinter (to print non-symbolic masks) and ARMAsmParser (to parse non-symbolic masks) will be needed.

Patch by Petr Pavlu!

llvm-svn: 214505
 2014-08-01 12:42:11 +00:00