[PATCH] fix for wrong MMX packed sub definitions in X86InstrMMX.td.

[Andrea_DiBiagio at sn.scee.net]

Hello,

I'd like to contribute a fix for wrong definitions of MMX packed sub 
instructions in X86InstrMMX.td.

All the tablegen definitions of MMX packed sub instructions were wrongly 
marked 
as commutative. Because of this, the "Two-Address instruction pass" 
wrongly
thought it was always safe to interchange the operands of psub 
instructions.

The test case in the attached patch verifies that the Two-Address 
instruction
pass never interchanges mmx packed sub instructions.

Thanks,
Andrea Di Biagio
SN Systems - Sony Computer Entertainment Group



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