[PATCH] D15418: [mips][microMIPS] Implement LH, LHE, LHU and LHUE 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 subscriber: dsanders.

The patch implements microMIPSr6 LH, LHE, LHU and LHUE instructions.

There was a problem with previous implementation of this instructions (D9824) and because of that commit rL254897 was reverted.

After commit of previous patch, test-suite failed with error message in the form of:
    fatal error: error in backend: Cannot select: t124: i32,ch = load<LD2[%d](tbaa=<0x94acc48>), sext from i16> t0, t2, undef:i32

There was problem with selecting lh and lhu instructions in LLVM backend.

For that reason I decided to revert commit rL254897 and make this patch which besides implementation of instructions and standard regression tests also includes CodeGen tests (lh_lhu.ll).

http://reviews.llvm.org/D15418

Files:
  lib/Target/Mips/MicroMips32r6InstrFormats.td
  lib/Target/Mips/MicroMips32r6InstrInfo.td
  lib/Target/Mips/MicroMipsInstrInfo.td
  lib/Target/Mips/MipsInstrInfo.td
  test/CodeGen/Mips/llvm-ir/lh_lhu.ll
  test/MC/Disassembler/Mips/micromips32r6/valid.txt
  test/MC/Disassembler/Mips/micromips64r6/valid.txt
  test/MC/Mips/micromips-invalid.s
  test/MC/Mips/micromips32r6/invalid.s
  test/MC/Mips/micromips32r6/valid.s
  test/MC/Mips/micromips64r6/invalid.s
  test/MC/Mips/micromips64r6/valid.s
  test/MC/Mips/mips32r6/invalid.s
  test/MC/Mips/mips64r6/invalid.s

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