builtins.cpp
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// RUN: %clang_cc1 -triple=x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s
// Builtins inside a namespace inside an extern "C" must be considered builtins.
extern "C" {
namespace X {
double __builtin_fabs(double);
float __builtin_fabsf(float) noexcept;
} // namespace X
}
int o = X::__builtin_fabs(-2.0);
// CHECK: @o = global i32 2, align 4
long p = X::__builtin_fabsf(-3.0f);
// CHECK: @p = global i64 3, align 8
// PR8839
extern "C" char memmove();
int main() {
// CHECK: call {{signext i8|i8}} @memmove()
return memmove();
}
struct S;
// CHECK: define {{.*}} @_Z9addressofbR1SS0_(
S *addressof(bool b, S &s, S &t) {
// CHECK: %[[LVALUE:.*]] = phi
// CHECK: ret {{.*}}* %[[LVALUE]]
return __builtin_addressof(b ? s : t);
}
extern "C" int __builtin_abs(int); // #1
long __builtin_abs(long); // #2
extern "C" int __builtin_abs(int); // #3
int x = __builtin_abs(-2);
// CHECK: store i32 2, i32* @x, align 4
long y = __builtin_abs(-2l);
// CHECK: [[Y:%.+]] = call i64 @_Z13__builtin_absl(i64 -2)
// CHECK: store i64 [[Y]], i64* @y, align 8
extern const char char_memchr_arg[32];
char *memchr_result = __builtin_char_memchr(char_memchr_arg, 123, 32);
// CHECK: call i8* @memchr(i8* getelementptr inbounds ([32 x i8], [32 x i8]* @char_memchr_arg, i64 0, i64 0), i32 123, i64 32)
int constexpr_overflow_result() {
constexpr int x = 1;
// CHECK: alloca i32
constexpr int y = 2;
// CHECK: alloca i32
int z;
// CHECK: [[Z:%.+]] = alloca i32
__builtin_sadd_overflow(x, y, &z);
return z;
// CHECK: [[RET_PTR:%.+]] = extractvalue { i32, i1 } %0, 0
// CHECK: store i32 [[RET_PTR]], i32* [[Z]]
// CHECK: [[RET_VAL:%.+]] = load i32, i32* [[Z]]
// CHECK: ret i32 [[RET_VAL]]
}