You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
1.4 KiB
64 lines
1.4 KiB
#include <cstdint>
|
|
|
|
#include "benchmark/benchmark.h"
|
|
|
|
namespace {
|
|
#if defined(__GNUC__)
|
|
std::int64_t double_up(const std::int64_t x) __attribute__((const));
|
|
#endif
|
|
std::int64_t double_up(const std::int64_t x) { return x * 2; }
|
|
} // namespace
|
|
|
|
// Using DoNotOptimize on types like BitRef seem to cause a lot of problems
|
|
// with the inline assembly on both GCC and Clang.
|
|
struct BitRef {
|
|
int index;
|
|
unsigned char& byte;
|
|
|
|
public:
|
|
static BitRef Make() {
|
|
static unsigned char arr[2] = {};
|
|
BitRef b(1, arr[0]);
|
|
return b;
|
|
}
|
|
|
|
private:
|
|
BitRef(int i, unsigned char& b) : index(i), byte(b) {}
|
|
};
|
|
|
|
int main(int, char*[]) {
|
|
// this test verifies compilation of DoNotOptimize() for some types
|
|
|
|
char buffer1[1] = "";
|
|
benchmark::DoNotOptimize(buffer1);
|
|
|
|
char buffer2[2] = "";
|
|
benchmark::DoNotOptimize(buffer2);
|
|
|
|
char buffer3[3] = "";
|
|
benchmark::DoNotOptimize(buffer3);
|
|
|
|
char buffer8[8] = "";
|
|
benchmark::DoNotOptimize(buffer8);
|
|
|
|
char buffer20[20] = "";
|
|
benchmark::DoNotOptimize(buffer20);
|
|
|
|
char buffer1024[1024] = "";
|
|
benchmark::DoNotOptimize(buffer1024);
|
|
char* bptr = &buffer1024[0];
|
|
benchmark::DoNotOptimize(bptr);
|
|
|
|
int x = 123;
|
|
benchmark::DoNotOptimize(x);
|
|
int* xp = &x;
|
|
benchmark::DoNotOptimize(xp);
|
|
benchmark::DoNotOptimize(x += 42);
|
|
|
|
std::int64_t y = double_up(x);
|
|
benchmark::DoNotOptimize(y);
|
|
|
|
// These tests are to e
|
|
BitRef lval = BitRef::Make();
|
|
benchmark::DoNotOptimize(lval);
|
|
}
|