Index: mlir/lib/TableGen/Pattern.cpp
===================================================================
--- mlir/lib/TableGen/Pattern.cpp
+++ mlir/lib/TableGen/Pattern.cpp
@@ -324,7 +324,7 @@
     // means we want to capture the op itself.
     if (op->getNumResults() == 0) {
       LLVM_DEBUG(llvm::dbgs() << name << " (Op)\n");
-      return std::string(name);
+      return formatv(fmt, name);
     }
 
     // We are referencing all results of the multi-result op. A specific result
Index: mlir/test/lib/Dialect/Test/TestOps.td
===================================================================
--- mlir/test/lib/Dialect/Test/TestOps.td
+++ mlir/test/lib/Dialect/Test/TestOps.td
@@ -690,6 +690,16 @@
   let results = (outs I32:$output);
 }
 
+def TestLocationSrcNoResOp : TEST_Op<"loc_src_no_res"> {
+  let arguments = (ins I32:$input);
+  let results = (outs);
+}
+
+def TestLocationDstNoResOp : TEST_Op<"loc_dst_no_res"> {
+  let arguments = (ins I32:$input);
+  let results = (outs);
+}
+
 //===----------------------------------------------------------------------===//
 // Test Patterns
 //===----------------------------------------------------------------------===//
@@ -1375,6 +1385,11 @@
               (location "named")),
             (location "fused", $res2, $res3))>;
 
+// Test that we can use the location of an op without results
+def : Pat<(TestLocationSrcNoResOp:$loc
+            (TestLocationSrcOp (TestLocationSrcOp $input))),
+          (TestLocationDstNoResOp $input, (location $loc))>;
+
 //===----------------------------------------------------------------------===//
 // Test Patterns (Type Builders)
 
Index: mlir/test/mlir-tblgen/pattern.mlir
===================================================================
--- mlir/test/mlir-tblgen/pattern.mlir
+++ mlir/test/mlir-tblgen/pattern.mlir
@@ -15,10 +15,12 @@
   %0 = "test.loc_src"(%arg0) : (i32) -> i32 loc("loc3")
   %1 = "test.loc_src"(%0) : (i32) -> i32 loc("loc2")
   %2 = "test.loc_src"(%1) : (i32) -> i32 loc("loc1")
+  "test.loc_src_no_res"(%2) : (i32) -> () loc("loc4")
 
   // CHECK: "test.loc_dst"({{.*}}) : (i32) -> i32 loc("loc1")
   // CHECK: "test.loc_dst"({{.*}}) : (i32) -> i32 loc("named")
   // CHECK: "test.loc_dst"({{.*}}) : (i32) -> i32 loc(fused<"fused">["loc2", "loc3"])
+  // CHECK: "test.loc_dst_no_res"({{.*}}) : (i32) -> () loc("loc4")
   return %1 : i32
 }
 
Index: mlir/tools/mlir-tblgen/RewriterGen.cpp
===================================================================
--- mlir/tools/mlir-tblgen/RewriterGen.cpp
+++ mlir/tools/mlir-tblgen/RewriterGen.cpp
@@ -1148,8 +1148,8 @@
 std::string PatternEmitter::handleLocationDirective(DagNode tree) {
   assert(tree.isLocationDirective());
   auto lookUpArgLoc = [this, &tree](int idx) {
-    const auto *const lookupFmt = "(*{0}.begin()).getLoc()";
-    return symbolInfoMap.getAllRangeUse(tree.getArgName(idx), lookupFmt);
+    const auto *const lookupFmt = "{0}.getLoc()";
+    return symbolInfoMap.getValueAndRangeUse(tree.getArgName(idx), lookupFmt);
   };
 
   if (tree.getNumArgs() == 0)