diff options
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp | 1 | ||||
| -rw-r--r-- | llvm/lib/Target/AMDGPU/SILowerI1Copies.cpp | 30 |
2 files changed, 26 insertions, 5 deletions
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp b/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp index d7108416ccc..2e43d427e47 100644 --- a/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp +++ b/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp @@ -440,6 +440,7 @@ AMDGPUTargetLowering::AMDGPUTargetLowering(const TargetMachine &TM, setSchedulingPreference(Sched::RegPressure); setJumpIsExpensive(true); + setHasMultipleConditionRegisters(true); // SI at least has hardware support for floating point exceptions, but no way // of using or handling them is implemented. They are also optional in OpenCL diff --git a/llvm/lib/Target/AMDGPU/SILowerI1Copies.cpp b/llvm/lib/Target/AMDGPU/SILowerI1Copies.cpp index 9e62980940b..3b7db8c465f 100644 --- a/llvm/lib/Target/AMDGPU/SILowerI1Copies.cpp +++ b/llvm/lib/Target/AMDGPU/SILowerI1Copies.cpp @@ -121,11 +121,31 @@ bool SILowerI1Copies::runOnMachineFunction(MachineFunction &MF) { } } - BuildMI(MBB, &MI, DL, TII->get(AMDGPU::V_CNDMASK_B32_e64)) - .addOperand(Dst) - .addImm(0) - .addImm(-1) - .addOperand(Src); + // If there are uses which are just a copy back from this new VReg_1 + // to another SGPR_64 just forward propagate original SGPR_64. + SmallVector<MachineInstr *, 4> RegUses; + for (auto &Use : MRI.use_instructions(Dst.getReg())) + if (Use.isFullCopy()) + RegUses.push_back(&Use); + + while (!RegUses.empty()) { + MachineInstr *Use = RegUses.pop_back_val(); + if (Use->getOperand(1).getReg() == Dst.getReg()) { + unsigned RegCopy = Use->getOperand(0).getReg(); + if (!TargetRegisterInfo::isVirtualRegister(RegCopy)) + continue; + Use->eraseFromParent(); + MRI.replaceRegWith(RegCopy, Src.getReg()); + } + } + + if (!MRI.use_empty(Dst.getReg())) + BuildMI(MBB, &MI, DL, TII->get(AMDGPU::V_CNDMASK_B32_e64)) + .addOperand(Dst) + .addImm(0) + .addImm(-1) + .addOperand(Src); + MI.eraseFromParent(); } else if (TRI->getCommonSubClass(DstRC, &AMDGPU::SGPR_64RegClass) && SrcRC == &AMDGPU::VReg_1RegClass) { |
