1 // RUN: %clang_cc1 -triple=x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s 2 3 // Builtins inside a namespace inside an extern "C" must be considered builtins. 4 extern "C" { 5 namespace X { 6 double __builtin_fabs(double); 7 float __builtin_fabsf(float) noexcept; 8 } // namespace X 9 } 10 11 int o = X::__builtin_fabs(-2.0); 12 // CHECK: @o ={{.*}} global i32 2, align 4 13 14 long p = X::__builtin_fabsf(-3.0f); 15 // CHECK: @p ={{.*}} global i64 3, align 8 16 17 // PR8839 18 extern "C" char memmove(); 19 20 int main() { 21 // CHECK: call {{signext i8|i8}} @memmove() 22 return memmove(); 23 } 24 25 struct S; 26 // CHECK: define {{.*}} @_Z9addressofbR1SS0_( 27 S *addressof(bool b, S &s, S &t) { 28 // CHECK: %[[LVALUE:.*]] = phi 29 // CHECK: ret {{.*}}* %[[LVALUE]] 30 return __builtin_addressof(b ? s : t); 31 } 32 33 extern "C" int __builtin_abs(int); // #1 34 long __builtin_abs(long); // #2 35 extern "C" int __builtin_abs(int); // #3 36 37 int x = __builtin_abs(-2); 38 // CHECK: store i32 2, i32* @x, align 4 39 40 long y = __builtin_abs(-2l); 41 // CHECK: [[Y:%.+]] = call i64 @_Z13__builtin_absl(i64 -2) 42 // CHECK: store i64 [[Y]], i64* @y, align 8 43 44 extern const char char_memchr_arg[32]; 45 char *memchr_result = __builtin_char_memchr(char_memchr_arg, 123, 32); 46 // CHECK: call i8* @memchr(i8* getelementptr inbounds ([32 x i8], [32 x i8]* @char_memchr_arg, i64 0, i64 0), i32 123, i64 32) 47 48 int constexpr_overflow_result() { 49 constexpr int x = 1; 50 // CHECK: alloca i32 51 constexpr int y = 2; 52 // CHECK: alloca i32 53 int z; 54 // CHECK: [[Z:%.+]] = alloca i32 55 56 __builtin_sadd_overflow(x, y, &z); 57 return z; 58 // CHECK: [[RET_PTR:%.+]] = extractvalue { i32, i1 } %0, 0 59 // CHECK: store i32 [[RET_PTR]], i32* [[Z]] 60 // CHECK: [[RET_VAL:%.+]] = load i32, i32* [[Z]] 61 // CHECK: ret i32 [[RET_VAL]] 62 } 63