diff --git a/mlir/include/mlir/Dialect/SCF/IR/SCFOps.td b/mlir/include/mlir/Dialect/SCF/IR/SCFOps.td
--- a/mlir/include/mlir/Dialect/SCF/IR/SCFOps.td
+++ b/mlir/include/mlir/Dialect/SCF/IR/SCFOps.td
@@ -773,6 +773,8 @@
   let skipDefaultBuilders = 1;
   let builders = [
     OpBuilder<(ins "TypeRange":$resultTypes, "Value":$cond)>,
+    OpBuilder<(ins "TypeRange":$resultTypes, "Value":$cond,
+      "bool":$addThenBlock, "bool":$addElseBlock)>,
     OpBuilder<(ins "Value":$cond, "bool":$withElseRegion)>,
     OpBuilder<(ins "TypeRange":$resultTypes, "Value":$cond,
       "bool":$withElseRegion)>,
diff --git a/mlir/lib/Dialect/SCF/IR/SCF.cpp b/mlir/lib/Dialect/SCF/IR/SCF.cpp
--- a/mlir/lib/Dialect/SCF/IR/SCF.cpp
+++ b/mlir/lib/Dialect/SCF/IR/SCF.cpp
@@ -1593,13 +1593,26 @@
 
 void IfOp::build(OpBuilder &builder, OperationState &result,
                  TypeRange resultTypes, Value cond) {
+  return build(builder, result, resultTypes, cond, /*addThenBlock=*/false,
+               /*addElseBlock=*/false);
+}
+
+void IfOp::build(OpBuilder &builder, OperationState &result,
+                 TypeRange resultTypes, Value cond, bool addThenBlock,
+                 bool addElseBlock) {
+  assert((!addElseBlock || addThenBlock) &&
+         "must not create else block w/o then block");
   result.addTypes(resultTypes);
   result.addOperands(cond);
 
-  // Build regions.
+  // Add regions and blocks.
   OpBuilder::InsertionGuard guard(builder);
-  result.addRegion();
-  result.addRegion();
+  Region *thenRegion = result.addRegion();
+  if (addThenBlock)
+    builder.createBlock(thenRegion);
+  Region *elseRegion = result.addRegion();
+  if (addElseBlock)
+    builder.createBlock(elseRegion);
 }
 
 void IfOp::build(OpBuilder &builder, OperationState &result, Value cond,