[PATCH] [AArch64] Add add/sub/cmp/cmn aliases to MC AsmParser

[Arnaud A. de Grandmaison]

Well, the title says it all.

 

This patch teaches the AsmParser to accept some add/sub/cmp/cmn with

negative immediate operand and convert them as shown:

 

  add  Rd, Rn, -imm -> sub  Rd, Rn, imm

  sub  Rd, Rn, -imm -> add  Rd, Rn, imm

  adds Rd, Rn, -imm -> subs Rd, Rn, imm

  subs Rd, Rn, -imm -> adds Rd, Rn, imm

  cmp  Rn, -imm     -> cmn  Rn, imm

  cmn  Rn, -imm     -> cmp  Rn, imm

 

Those instructions are an alternate syntax available to assembly coders,

and are needed in order to support code already compiling with some other

assemblers.

 

OK to commit ?

 

Cheers,

--

Arnaud A. de Grandmaison
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