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Fix RemoveDeadValues: Bail out early when there are no terminators #133316

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Merged
merged 1 commit into from
Mar 27, 2025
Merged

Fix RemoveDeadValues: Bail out early when there are no terminators #133316

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2 changes: 2 additions & 0 deletions mlir/lib/Transforms/RemoveDeadValues.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -305,6 +305,8 @@ static void processFuncOp(FunctionOpInterface funcOp, Operation *module,
// since it forwards only to non-live value(s) (%1#1).
Operation *lastReturnOp = funcOp.back().getTerminator();
size_t numReturns = lastReturnOp->getNumOperands();
if (numReturns == 0)
return;
BitVector nonLiveRets(numReturns, true);
for (SymbolTable::SymbolUse use : uses) {
Operation *callOp = use.getUser();
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15 changes: 15 additions & 0 deletions mlir/test/Transforms/remove-dead-values.mlir
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Expand Up @@ -446,6 +446,21 @@ func.func @kernel(%arg0: memref<18xf32>) {

// -----


// CHECK-LABEL: llvm_unreachable
// CHECK-LABEL: @fn_with_llvm_unreachable
// CHECK-LABEL: @main
// CHECK: llvm.return
module @llvm_unreachable {
func.func private @fn_with_llvm_unreachable(%arg0: tensor<4x4xf32>) -> tensor<4x4xi1> {
llvm.unreachable
}
func.func private @main(%arg0: tensor<4x4xf32>) {
%0 = call @fn_with_llvm_unreachable(%arg0) : (tensor<4x4xf32>) -> tensor<4x4xi1>
llvm.return
}
}

// CHECK: func.func private @no_block_func_declaration()
func.func private @no_block_func_declaration() -> ()

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