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gbench-stream/benchmark/test/state_assembly_test.cc
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state_assembly_test.cc
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#include <benchmark/benchmark.h>
#ifdef __clang__
#pragma clang diagnostic ignored "-Wreturn-type"
#endif
// clang-format off
extern "C" {
extern int ExternInt;
benchmark::State& GetState();
void Fn();
}
// clang-format on
using benchmark::State;
// CHECK-LABEL: test_for_auto_loop:
extern "C" int test_for_auto_loop() {
State& S = GetState();
int x = 42;
// CHECK: [[CALL:call(q)*]] _ZN9benchmark5State16StartKeepRunningEv
// CHECK-NEXT: testq %rbx, %rbx
// CHECK-NEXT: je [[LOOP_END:.*]]
for (auto _ : S) {
// CHECK: .L[[LOOP_HEAD:[a-zA-Z0-9_]+]]:
// CHECK-GNU-NEXT: subq $1, %rbx
// CHECK-CLANG-NEXT: {{(addq \$1, %rax|incq %rax|addq \$-1, %rbx)}}
// CHECK-NEXT: jne .L[[LOOP_HEAD]]
benchmark::DoNotOptimize(x);
}
// CHECK: [[LOOP_END]]:
// CHECK: [[CALL]] _ZN9benchmark5State17FinishKeepRunningEv
// CHECK: movl $101, %eax
// CHECK: ret
return 101;
}
// CHECK-LABEL: test_while_loop:
extern "C" int test_while_loop() {
State& S = GetState();
int x = 42;
// CHECK: j{{(e|mp)}} .L[[LOOP_HEADER:[a-zA-Z0-9_]+]]
// CHECK-NEXT: .L[[LOOP_BODY:[a-zA-Z0-9_]+]]:
while (S.KeepRunning()) {
// CHECK-GNU-NEXT: subq $1, %[[IREG:[a-z]+]]
// CHECK-CLANG-NEXT: {{(addq \$-1,|decq)}} %[[IREG:[a-z]+]]
// CHECK: movq %[[IREG]], [[DEST:.*]]
benchmark::DoNotOptimize(x);
}
// CHECK-DAG: movq [[DEST]], %[[IREG]]
// CHECK-DAG: testq %[[IREG]], %[[IREG]]
// CHECK-DAG: jne .L[[LOOP_BODY]]
// CHECK-DAG: .L[[LOOP_HEADER]]:
// CHECK: cmpb $0
// CHECK-NEXT: jne .L[[LOOP_END:[a-zA-Z0-9_]+]]
// CHECK: [[CALL:call(q)*]] _ZN9benchmark5State16StartKeepRunningEv
// CHECK: .L[[LOOP_END]]:
// CHECK: [[CALL]] _ZN9benchmark5State17FinishKeepRunningEv
// CHECK: movl $101, %eax
// CHECK: ret
return 101;
}
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