altera-id-dependent-backward-branch¶
查找在循环中使用的依赖于 ID 的变量和字段。这会导致循环内部发生分支，从而导致性能下降。
// The following code will produce a warning because this ID-dependent
// variable is used in a loop condition statement.
int ThreadID = get_local_id(0);
// The following loop will produce a warning because the loop condition
// statement depends on an ID-dependent variable.
for (int i = 0; i < ThreadID; ++i) {
std::cout << i << std::endl;
}
// The following loop will not produce a warning, because the ID-dependent
// variable is not used in the loop condition statement.
for (int i = 0; i < 100; ++i) {
std::cout << ThreadID << std::endl;
}