[PATCH] D16676: [mips][microMIPS] Add CodeGen support for SUBU16, SUB, SUBU, DSUB and DSUBU instructions

[Zlatko Buljan via llvm-commits]

zbuljan created this revision.
zbuljan added reviewers: dsanders, hvarga, zoran.jovanovic.
zbuljan added subscribers: petarj, llvm-commits.
Herald added a reviewer: vkalintiris.
Herald added a subscriber: dsanders.

The patch adds CodeGen support for microMIPSr6 SUBU16, SUB, SUBU, DSUB and DSUBU instructions:
- updated sub.ll with tests for microMIPSr6 SUBU16, SUB, SUBU, DSUB and DSUBU instruction selection
- separated microMIPS64r6 DSUB and DSUBU instructions from equivalent MIPS64 instructions using NotInMicroMips predicate
- added DAG patterns using MipsPat for proper selection of instructions
- implemented DSUB and DSUBU instructions for microMIPS64r6 and added tests for the standard encodings


http://reviews.llvm.org/D16676

Files:
  lib/Target/Mips/MicroMips32r6InstrInfo.td
  lib/Target/Mips/MicroMips64r6InstrFormats.td
  lib/Target/Mips/MicroMips64r6InstrInfo.td
  lib/Target/Mips/MicroMipsInstrInfo.td
  lib/Target/Mips/Mips64InstrInfo.td
  lib/Target/Mips/MipsInstrInfo.td
  test/CodeGen/Mips/llvm-ir/sub.ll
  test/MC/Disassembler/Mips/micromips64r6/valid.txt
  test/MC/Mips/micromips64r6/valid.s

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