diff options
Diffstat (limited to 'llvm/lib/Target/AMDGPU')
| -rw-r--r-- | llvm/lib/Target/AMDGPU/SIInsertWaits.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/SIInsertWaits.cpp b/llvm/lib/Target/AMDGPU/SIInsertWaits.cpp index f250782de58..bf0d6a74336 100644 --- a/llvm/lib/Target/AMDGPU/SIInsertWaits.cpp +++ b/llvm/lib/Target/AMDGPU/SIInsertWaits.cpp @@ -601,6 +601,12 @@ bool SIInsertWaits::runOnMachineFunction(MachineFunction &MF) { insertDPPWaitStates(I); } + // Insert required wait states for SMRD reading an SGPR written by a VALU + // instruction. + if (ST.getGeneration() <= AMDGPUSubtarget::SOUTHERN_ISLANDS && + I->getOpcode() == AMDGPU::V_READFIRSTLANE_B32) + TII->insertWaitStates(MBB, std::next(I), 4); + // Wait for everything before a barrier. if (I->getOpcode() == AMDGPU::S_BARRIER) Changes |= insertWait(MBB, I, LastIssued); |
