clang/test/AST/ast-dump-pragma-unroll.cpp

   1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -ast-dump %s | FileCheck %s
   2
   3 using size_t = unsigned long long;
   4
   5 // CHECK: LoopHintAttr {{.*}} Implicit unroll UnrollCount Numeric
   6 // CHECK: LoopHintAttr {{.*}} Implicit unroll UnrollCount Numeric
   7 // CHECK: LoopHintAttr {{.*}} Implicit unroll Unroll Disable
   8 // CHECK: LoopHintAttr {{.*}} Implicit unroll Unroll Disable
   9 template <bool Flag>
  10 int value_dependent(int n) {
  11   constexpr int N = 100;
  12   auto init = [=]() { return Flag ? n : 0UL; };
  13   auto cond = [=](size_t ix) { return Flag ? ix != 0 : ix < 10; };
  14   auto iter = [=](size_t ix) {
  15     return Flag ? ix & ~(1ULL << __builtin_clzll(ix)) : ix + 1;
  16   };
  17
  18 #pragma unroll Flag ? 1 : N
  19   for (size_t ix = init(); cond(ix); ix = iter(ix)) {
  20     n *= n;
  21   }
  22 #pragma unroll Flag ? 0 : N
  23   for (size_t ix = init(); cond(ix); ix = iter(ix)) {
  24     n *= n;
  25   }
  26   return n;
  27 }
  28
  29 void test_value_dependent(int n) {
  30   value_dependent<true>(n);
  31 }