[PATCH] D16353: [mips] MIPSR6 compact branch support

[Simon Dardis via llvm-commits]

sdardis created this revision.
sdardis added a reviewer: vkalintiris.
sdardis added a subscriber: llvm-commits.
Herald added a subscriber: dsanders.

Summary:
MIPSR6 introduces a class of branches called compact branches. Unlike the
traditional MIPS branches which have a delay slot, compact branches do not
have a delay slot. The instruction following the compact branch is only
executed if the branch is not taken and must not be a branch.
    
Generate compact branches for MIPSR6 when the delay slot filler cannot fill
a delay slot. Inspect the generated code for forbidden slot hazards (a compact
branch with an adjacent branch or other CTI) and insert nops to clear this
hazard.

http://reviews.llvm.org/D16353

Files:
  lib/Target/Mips/CMakeLists.txt
  lib/Target/Mips/Mips.h
  lib/Target/Mips/MipsDelaySlotFiller.cpp
  lib/Target/Mips/MipsHazardSchedule.cpp
  lib/Target/Mips/MipsSEInstrInfo.cpp
  lib/Target/Mips/MipsTargetMachine.cpp
  test/CodeGen/Mips/analyzebranch.ll
  test/CodeGen/Mips/atomic.ll
  test/CodeGen/Mips/compact-branches.ll
  test/CodeGen/Mips/fcmp.ll
  test/CodeGen/Mips/fpbr.ll

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