[PATCH] D20284: [mips] Restrict the creation of compact branches

[Simon Dardis via llvm-commits]

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Restrict the creation of compact branches so that they meet the ISA encoding
requirements. Notably do not permit $zero to be used as a operand for compact
branches and ensure that some other branches fulfil the requirement that
rs != rt.
    
Fixup cases where $rs > $rt for bnec and beqc.

Repository:
  rL LLVM

http://reviews.llvm.org/D20284

Files:
  lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
  lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.h
  lib/Target/Mips/Mips32r6InstrFormats.td
  lib/Target/Mips/MipsInstrInfo.cpp
  test/CodeGen/Mips/compactbranches/no-beqzc-bnezc.ll

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