[mlir][Transforms][NFC] Dialect conversion: Reformat mat. error message

This commit changes the format of the materialization error message.

Previously: `failed to legalize unresolved materialization from ('f64') to 'f32' that remained live after conversion`
Now: `failed to legalize unresolved materialization from ('f64') to ('f32') that remained live after conversion`

This commit is in preparation of merging the 1:1 and 1:N dialect conversions. At that point, target materializations may create more than one SSA value. Sending this change as a separate PR to keep the main PR small.

Author: matthias-springer

mlir/lib/Transforms/Utils/DialectConversion.cpp

@@ -2457,11 +2457,11 @@ legalizeUnresolvedMaterialization(RewriterBase &rewriter,
     }
   }
 
-  InFlightDiagnostic diag = op->emitError()
-                            << "failed to legalize unresolved materialization "
-                               "from ("
-                            << inputOperands.getTypes() << ") to " << outputType
-                            << " that remained live after conversion";
+  InFlightDiagnostic diag =
+      op->emitError() << "failed to legalize unresolved materialization "
+                         "from ("
+                      << inputOperands.getTypes() << ") to (" << outputType
+                      << ") that remained live after conversion";
   diag.attachNote(op->getUsers().begin()->getLoc())
       << "see existing live user here: " << *op->getUsers().begin();
   return failure();

mlir/test/Dialect/Bufferization/Transforms/finalizing-bufferize.mlir

@@ -78,7 +78,7 @@ func.func @static_layout_to_no_layout_cast(%m: memref<?xf32, strided<[1], offset
 // memref.cast.
 func.func @no_layout_to_dyn_layout_cast(%m: memref<?xf32>) -> memref<?xf32, strided<[1], offset: ?>> {
   %0 = bufferization.to_tensor %m : memref<?xf32>
-  // expected-error @+1 {{failed to legalize unresolved materialization from ('memref<?xf32>') to 'memref<?xf32, strided<[1], offset: ?>>' that remained live after conversion}}
+  // expected-error @+1 {{failed to legalize unresolved materialization from ('memref<?xf32>') to ('memref<?xf32, strided<[1], offset: ?>>') that remained live after conversion}}
   %1 = bufferization.to_memref %0 : memref<?xf32, strided<[1], offset: ?>>
   // expected-note @below{{see existing live user here}}
   return %1 : memref<?xf32, strided<[1], offset: ?>>

mlir/test/Transforms/test-legalize-erased-op-with-uses.mlir

@@ -3,7 +3,7 @@
 // Test that an error is emitted when an operation is marked as "erased", but
 // has users that live across the conversion.
 func.func @remove_all_ops(%arg0: i32) -> i32 {
-  // expected-error@below {{failed to legalize unresolved materialization from () to 'i32' that remained live after conversion}}
+  // expected-error@below {{failed to legalize unresolved materialization from () to ('i32') that remained live after conversion}}
   %0 = "test.illegal_op_a"() : () -> i32
   // expected-note@below {{see existing live user here}}
   return %0 : i32

mlir/test/Transforms/test-legalize-type-conversion.mlir

@@ -2,7 +2,7 @@
 
 
 func.func @test_invalid_arg_materialization(
-  // expected-error@below {{failed to legalize unresolved materialization from () to 'i16' that remained live after conversion}}
+  // expected-error@below {{failed to legalize unresolved materialization from () to ('i16') that remained live after conversion}}
   %arg0: i16) {
   // expected-note@below{{see existing live user here}}
   "foo.return"(%arg0) : (i16) -> ()
@@ -21,7 +21,7 @@ func.func @test_valid_arg_materialization(%arg0: i64) {
 // -----
 
 func.func @test_invalid_result_materialization() {
-  // expected-error@below {{failed to legalize unresolved materialization from ('f64') to 'f16' that remained live after conversion}}
+  // expected-error@below {{failed to legalize unresolved materialization from ('f64') to ('f16') that remained live after conversion}}
   %result = "test.type_producer"() : () -> f16
   // expected-note@below{{see existing live user here}}
   "foo.return"(%result) : (f16) -> ()
@@ -30,7 +30,7 @@ func.func @test_invalid_result_materialization() {
 // -----
 
 func.func @test_invalid_result_materialization() {
-  // expected-error@below {{failed to legalize unresolved materialization from ('f64') to 'f16' that remained live after conversion}}
+  // expected-error@below {{failed to legalize unresolved materialization from ('f64') to ('f16') that remained live after conversion}}
   %result = "test.type_producer"() : () -> f16
   // expected-note@below{{see existing live user here}}
   "foo.return"(%result) : (f16) -> ()
@@ -50,7 +50,7 @@ func.func @test_transitive_use_materialization() {
 // -----
 
 func.func @test_transitive_use_invalid_materialization() {
-  // expected-error@below {{failed to legalize unresolved materialization from ('f64') to 'f16' that remained live after conversion}}
+  // expected-error@below {{failed to legalize unresolved materialization from ('f64') to ('f16') that remained live after conversion}}
   %result = "test.another_type_producer"() : () -> f16
   // expected-note@below{{see existing live user here}}
   "foo.return"(%result) : (f16) -> ()
@@ -102,7 +102,7 @@ func.func @test_block_argument_not_converted() {
 // Make sure argument type changes aren't implicitly forwarded.
 func.func @test_signature_conversion_no_converter() {
   "test.signature_conversion_no_converter"() ({
-  // expected-error@below {{failed to legalize unresolved materialization from ('f64') to 'f32' that remained live after conversion}}
+  // expected-error@below {{failed to legalize unresolved materialization from ('f64') to ('f32') that remained live after conversion}}
   ^bb0(%arg0: f32):
     "test.type_consumer"(%arg0) : (f32) -> ()
     // expected-note@below{{see existing live user here}}