mirror of
https://github.com/google/benchmark.git
synced 2024-12-28 13:30:15 +08:00
7b03df7ff7
* Add tests to verify assembler output -- Fix DoNotOptimize. For things like `DoNotOptimize`, `ClobberMemory`, and even `KeepRunning()`, it is important exactly what assembly they generate. However, we currently have no way to test this. Instead it must be manually validated every time a change occurs -- including a change in compiler version. This patch attempts to introduce a way to test the assembled output automatically. It's mirrors how LLVM verifies compiler output, and it uses LLVM FileCheck to run the tests in a similar way. The tests function by generating the assembly for a test in CMake, and then using FileCheck to verify the // CHECK lines in the source file are found in the generated assembly. Currently, the tests only run on 64-bit x86 systems under GCC and Clang, and when FileCheck is found on the system. Additionally, this patch tries to improve the code gen from DoNotOptimize. This should probably be a separate change, but I needed something to test. * Disable assembly tests on Bazel for now * Link FIXME to github issue * Fix Tests on OS X * fix strip_asm.py to work on both Linux and OS X like targets
65 lines
1.3 KiB
C++
65 lines
1.3 KiB
C++
#include <benchmark/benchmark.h>
|
|
|
|
#ifdef __clang__
|
|
#pragma clang diagnostic ignored "-Wreturn-type"
|
|
#endif
|
|
|
|
extern "C" {
|
|
|
|
extern int ExternInt;
|
|
extern int ExternInt2;
|
|
extern int ExternInt3;
|
|
|
|
}
|
|
|
|
// CHECK-LABEL: test_basic:
|
|
extern "C" void test_basic() {
|
|
int x;
|
|
benchmark::DoNotOptimize(&x);
|
|
x = 101;
|
|
benchmark::ClobberMemory();
|
|
// CHECK: leaq [[DEST:[^,]+]], %rax
|
|
// CHECK: movl $101, [[DEST]]
|
|
// CHECK: ret
|
|
}
|
|
|
|
// CHECK-LABEL: test_redundant_store:
|
|
extern "C" void test_redundant_store() {
|
|
ExternInt = 3;
|
|
benchmark::ClobberMemory();
|
|
ExternInt = 51;
|
|
// CHECK-DAG: ExternInt
|
|
// CHECK-DAG: movl $3
|
|
// CHECK: movl $51
|
|
}
|
|
|
|
// CHECK-LABEL: test_redundant_read:
|
|
extern "C" void test_redundant_read() {
|
|
int x;
|
|
benchmark::DoNotOptimize(&x);
|
|
x = ExternInt;
|
|
benchmark::ClobberMemory();
|
|
x = ExternInt2;
|
|
// CHECK: leaq [[DEST:[^,]+]], %rax
|
|
// CHECK: ExternInt(%rip)
|
|
// CHECK: movl %eax, [[DEST]]
|
|
// CHECK-NOT: ExternInt2
|
|
// CHECK: ret
|
|
}
|
|
|
|
// CHECK-LABEL: test_redundant_read2:
|
|
extern "C" void test_redundant_read2() {
|
|
int x;
|
|
benchmark::DoNotOptimize(&x);
|
|
x = ExternInt;
|
|
benchmark::ClobberMemory();
|
|
x = ExternInt2;
|
|
benchmark::ClobberMemory();
|
|
// CHECK: leaq [[DEST:[^,]+]], %rax
|
|
// CHECK: ExternInt(%rip)
|
|
// CHECK: movl %eax, [[DEST]]
|
|
// CHECK: ExternInt2(%rip)
|
|
// CHECK: movl %eax, [[DEST]]
|
|
// CHECK: ret
|
|
}
|