diff options
Diffstat (limited to 'llvm/lib/Target/AMDGPU/GCNDPPCombine.cpp')
| -rw-r--r-- | llvm/lib/Target/AMDGPU/GCNDPPCombine.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/GCNDPPCombine.cpp b/llvm/lib/Target/AMDGPU/GCNDPPCombine.cpp index 53c84639abda..2bf365168048 100644 --- a/llvm/lib/Target/AMDGPU/GCNDPPCombine.cpp +++ b/llvm/lib/Target/AMDGPU/GCNDPPCombine.cpp @@ -123,6 +123,13 @@ bool GCNDPPCombine::isShrinkable(MachineInstr &MI) const { LLVM_DEBUG(dbgs() << " Inst hasn't e32 equivalent\n"); return false; } + if (const auto *SDst = TII->getNamedOperand(MI, AMDGPU::OpName::sdst)) { + // Give up if there are any uses of the carry-out from instructions like + // V_ADD_CO_U32. The shrunken form of the instruction would write it to vcc + // instead of to a virtual register. + if (!MRI->use_nodbg_empty(SDst->getReg())) + return false; + } // check if other than abs|neg modifiers are set (opsel for example) const int64_t Mask = ~(SISrcMods::ABS | SISrcMods::NEG); if (!hasNoImmOrEqual(MI, AMDGPU::OpName::src0_modifiers, 0, Mask) || |