[clang-tidy] altera-id-dependent-backward-branch: refactor test

This is a preparation for future fixes that need more tests.

* Put all "Inferred Assignments" testing at the end
* Group together ID-dependent variable/member testing
* Group together unused inferred assignments
* Use a literal instead of `get_local_size` which may have special meaning
* Create a new `struct` for each variable because analysis is done per field,
  not per field per instance.

Depends on D145303

Reviewed By: carlosgalvezp

Differential Revision: https://reviews.llvm.org/D145304

diff --git a/clang-tools-extra/test/clang-tidy/checkers/altera/id-dependent-backward-branch.cpp b/clang-tools-extra/test/clang-tidy/checkers/altera/id-dependent-backward-branch.cpp
index 0c7a20ad6a1791e78454c0748976026ba22bb35c..c0a75fae98d757dc04c317dabb1bac519b455559 100644 (file)
--- a/clang-tools-extra/test/clang-tidy/checkers/altera/id-dependent-backward-branch.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/altera/id-dependent-backward-branch.cpp
@@ -1,9 +1,5 @@
 // RUN: %check_clang_tidy %s altera-id-dependent-backward-branch %t -- -header-filter=.* "--" -cl-std=CL1.2 -c
 
-typedef struct ExampleStruct {
-  int IDDepField;
-} ExampleStruct;
-
 void error() {
   // ==== Conditional Expressions ====
   int accumulator = 0;
@@ -32,39 +28,24 @@ void error() {
     accumulator++;
   }
 
-  ExampleStruct Example;
-  Example.IDDepField = get_local_id(0);
-
-  // ==== Inferred Assignments ====
-  int ThreadID2 = ThreadID * get_local_size(0);
-
-  int ThreadID3 = Example.IDDepField; // OK: not used in any loops
-
-  ExampleStruct UnusedStruct = {
-      ThreadID * 2 // OK: not used in any loops
-  };
-
-  for (int i = 0; i < ThreadID2; i++) {
-    // CHECK-NOTES: :[[@LINE-1]]:19: warning: backward branch (for loop) is ID-dependent due to variable reference to 'ThreadID2' and may cause performance degradation [altera-id-dependent-backward-branch]
-    // CHECK-NOTES: :[[@LINE-10]]:3: note: inferred assignment of ID-dependent value from ID-dependent variable ThreadID
-    accumulator++;
-  }
-
   do {
     accumulator++;
   } while (j < ThreadID);
   // CHECK-NOTES: :[[@LINE-1]]:12: warning: backward branch (do loop) is ID-dependent due to variable reference to 'ThreadID' and may cause performance degradation [altera-id-dependent-backward-branch]
-  // CHECK-NOTES: :[[@LINE-30]]:3: note: assignment of ID-dependent variable ThreadID
+  // CHECK-NOTES: :[[@LINE-12]]:3: note: assignment of ID-dependent variable ThreadID
+
+  struct { int IDDepField; } Example;
+  Example.IDDepField = get_local_id(0);
 
   for (int i = 0; i < Example.IDDepField; i++) {
     // CHECK-NOTES: :[[@LINE-1]]:19: warning: backward branch (for loop) is ID-dependent due to member reference to 'IDDepField' and may cause performance degradation [altera-id-dependent-backward-branch]
-    // CHECK-NOTES: :[[@LINE-25]]:3: note: assignment of ID-dependent field IDDepField
+    // CHECK-NOTES: :[[@LINE-4]]:3: note: assignment of ID-dependent field IDDepField
     accumulator++;
   }
 
   while (j < Example.IDDepField) {
     // CHECK-NOTES: :[[@LINE-1]]:10: warning: backward branch (while loop) is ID-dependent due to member reference to 'IDDepField' and may cause performance degradation [altera-id-dependent-backward-branch]
-    // CHECK-NOTES: :[[@LINE-31]]:3: note: assignment of ID-dependent field IDDepField
+    // CHECK-NOTES: :[[@LINE-10]]:3: note: assignment of ID-dependent field IDDepField
     accumulator++;
   }
 
@@ -72,7 +53,22 @@ void error() {
     accumulator++;
   } while (j < Example.IDDepField);
   // CHECK-NOTES: :[[@LINE-1]]:12: warning: backward branch (do loop) is ID-dependent due to member reference to 'IDDepField' and may cause performance degradation [altera-id-dependent-backward-branch]
-  // CHECK-NOTES: :[[@LINE-39]]:3: note: assignment of ID-dependent field IDDepField
+  // CHECK-NOTES: :[[@LINE-18]]:3: note: assignment of ID-dependent field IDDepField
+
+  // ==== Inferred Assignments ====
+  int ThreadID2 = ThreadID * 2;
+
+  for (int i = 0; i < ThreadID2; i++) {
+    // CHECK-NOTES: :[[@LINE-1]]:19: warning: backward branch (for loop) is ID-dependent due to variable reference to 'ThreadID2' and may cause performance degradation [altera-id-dependent-backward-branch]
+    // CHECK-NOTES: :[[@LINE-4]]:3: note: inferred assignment of ID-dependent value from ID-dependent variable ThreadID
+    accumulator++;
+  }
+
+  // ==== Unused Inferred Assignments ====
+  int UnusedThreadID = Example.IDDepField; // OK: not used in any loops
+
+  struct { int IDDepField; } UnusedStruct;
+  UnusedStruct.IDDepField = ThreadID * 2; // OK: not used in any loops
 }
 
 void success() {