65 lines
1.3 KiB
C++
65 lines
1.3 KiB
C++
#include <benchmark/benchmark.h>
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#ifdef __clang__
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#pragma clang diagnostic ignored "-Wreturn-type"
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#endif
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extern "C" {
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extern int ExternInt;
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extern int ExternInt2;
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extern int ExternInt3;
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}
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// CHECK-LABEL: test_basic:
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extern "C" void test_basic() {
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int x;
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benchmark::DoNotOptimize(&x);
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x = 101;
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benchmark::ClobberMemory();
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// CHECK: leaq [[DEST:[^,]+]], %rax
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// CHECK: movl $101, [[DEST]]
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// CHECK: ret
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}
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// CHECK-LABEL: test_redundant_store:
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extern "C" void test_redundant_store() {
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ExternInt = 3;
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benchmark::ClobberMemory();
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ExternInt = 51;
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// CHECK-DAG: ExternInt
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// CHECK-DAG: movl $3
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// CHECK: movl $51
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}
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// CHECK-LABEL: test_redundant_read:
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extern "C" void test_redundant_read() {
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int x;
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benchmark::DoNotOptimize(&x);
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x = ExternInt;
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benchmark::ClobberMemory();
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x = ExternInt2;
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// CHECK: leaq [[DEST:[^,]+]], %rax
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// CHECK: ExternInt(%rip)
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// CHECK: movl %eax, [[DEST]]
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// CHECK-NOT: ExternInt2
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// CHECK: ret
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}
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// CHECK-LABEL: test_redundant_read2:
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extern "C" void test_redundant_read2() {
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int x;
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benchmark::DoNotOptimize(&x);
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x = ExternInt;
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benchmark::ClobberMemory();
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x = ExternInt2;
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benchmark::ClobberMemory();
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// CHECK: leaq [[DEST:[^,]+]], %rax
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// CHECK: ExternInt(%rip)
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// CHECK: movl %eax, [[DEST]]
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// CHECK: ExternInt2(%rip)
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// CHECK: movl %eax, [[DEST]]
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// CHECK: ret
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}
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