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[AMDGPU] Simplify SITargetLowering::isSDNodeSourceOfDivergence. NFC. 

Check for read-modify-write AtomicSDNodes instead of using an exhaustive
list of ISD opcodes.

Differential Revision: https://reviews.llvm.org/D97671
This commit is contained in:
Jay Foad 2021-03-01 10:20:54 +00:00
parent 361cfdf228
commit 48ca5d3398
1 changed files with 7 additions and 17 deletions
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24
llvm/lib/Target/AMDGPU/SIISelLowering.cpp
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@ -11852,22 +11852,6 @@ bool SITargetLowering::isSDNodeSourceOfDivergence(
case ISD::INTRINSIC_W_CHAIN:
return AMDGPU::isIntrinsicSourceOfDivergence(
cast<ConstantSDNode>(N->getOperand(1))->getZExtValue());
case ISD::ATOMIC_CMP_SWAP:
case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS:
case ISD::ATOMIC_SWAP:
case ISD::ATOMIC_LOAD_ADD:
case ISD::ATOMIC_LOAD_SUB:
case ISD::ATOMIC_LOAD_AND:
case ISD::ATOMIC_LOAD_CLR:
case ISD::ATOMIC_LOAD_OR:
case ISD::ATOMIC_LOAD_XOR:
case ISD::ATOMIC_LOAD_NAND:
case ISD::ATOMIC_LOAD_MIN:
case ISD::ATOMIC_LOAD_MAX:
case ISD::ATOMIC_LOAD_UMIN:
case ISD::ATOMIC_LOAD_UMAX:
case ISD::ATOMIC_LOAD_FADD:
case ISD::ATOMIC_LOAD_FSUB:
case AMDGPUISD::ATOMIC_CMP_SWAP:
case AMDGPUISD::ATOMIC_INC:
case AMDGPUISD::ATOMIC_DEC:
@ -11890,9 +11874,15 @@ bool SITargetLowering::isSDNodeSourceOfDivergence(
case AMDGPUISD::BUFFER_ATOMIC_FADD:
case AMDGPUISD::BUFFER_ATOMIC_FMIN:
case AMDGPUISD::BUFFER_ATOMIC_FMAX:
// Target-specific read-modify-write atomics are sources of divergence.
return true;
default:
if (auto *A = dyn_cast<AtomicSDNode>(N)) {
// Generic read-modify-write atomics are sources of divergence.
return A->readMem() && A->writeMem();
}
return false;
}
return false;
}
bool SITargetLowering::denormalsEnabledForType(const SelectionDAG &DAG,