32 lines · cpp
1// RUN: %clang_cc1 -triple x86_64-unknown-unknown -ast-dump %s | FileCheck %s2 3using size_t = unsigned long long;4 5// CHECK: LoopHintAttr {{.*}} Implicit unroll UnrollCount Numeric6// CHECK: LoopHintAttr {{.*}} Implicit unroll UnrollCount Numeric7// CHECK: LoopHintAttr {{.*}} Implicit unroll Unroll Disable8// CHECK: LoopHintAttr {{.*}} Implicit unroll Unroll Disable9template <bool Flag>10int 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 : N19 for (size_t ix = init(); cond(ix); ix = iter(ix)) {20 n *= n;21 }22#pragma unroll Flag ? 0 : N23 for (size_t ix = init(); cond(ix); ix = iter(ix)) {24 n *= n;25 }26 return n;27}28 29void test_value_dependent(int n) {30 value_dependent<true>(n);31}32