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// 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;
for (int i = 0; i < get_local_id(0); i++) {
// CHECK-NOTES: :[[@LINE-1]]:19: warning: backward branch (for loop) is ID-dependent due to ID function call and may cause performance degradation [altera-id-dependent-backward-branch]
accumulator++;
}
int j = 0;
while (j < get_local_id(0)) {
// CHECK-NOTES: :[[@LINE-1]]:10: warning: backward branch (while loop) is ID-dependent due to ID function call and may cause performance degradation [altera-id-dependent-backward-branch]
accumulator++;
}
do {
accumulator++;
} while (j < get_local_id(0));
// CHECK-NOTES: :[[@LINE-1]]:12: warning: backward branch (do loop) is ID-dependent due to ID function call and may cause performance degradation [altera-id-dependent-backward-branch]
// ==== Assignments ====
int ThreadID = get_local_id(0);
while (j < ThreadID) {
// CHECK-NOTES: :[[@LINE-3]]:3: note: assignment of ID-dependent variable ThreadID
// CHECK-NOTES: :[[@LINE-2]]:10: warning: backward branch (while loop) is ID-dependent due to variable reference to 'ThreadID' and may cause performance degradation [altera-id-dependent-backward-branch]
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-9]]:3: note: inferred assignment of ID-dependent value from ID-dependent variable ThreadID
// CHECK-NOTES: :[[@LINE-2]]: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]
accumulator++;
}
do {
accumulator++;
} while (j < ThreadID);
// CHECK-NOTES: :[[@LINE-29]]:3: note: assignment of ID-dependent variable ThreadID
// CHECK-NOTES: :[[@LINE-2]]: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]
for (int i = 0; i < Example.IDDepField; i++) {
// CHECK-NOTES: :[[@LINE-24]]:3: note: assignment of ID-dependent field IDDepField
// CHECK-NOTES: :[[@LINE-2]]: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]
accumulator++;
}
while (j < Example.IDDepField) {
// CHECK-NOTES: :[[@LINE-30]]:3: note: assignment of ID-dependent field IDDepField
// CHECK-NOTES: :[[@LINE-2]]: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]
accumulator++;
}
do {
accumulator++;
} while (j < Example.IDDepField);
// CHECK-NOTES: :[[@LINE-38]]:3: note: assignment of ID-dependent field IDDepField
// CHECK-NOTES: :[[@LINE-2]]: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]
}
void success() {
int accumulator = 0;
for (int i = 0; i < 1000; i++) {
if (i < get_local_id(0)) {
accumulator++;
}
}
}
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