102 lines
2.5 KiB
C++
102 lines
2.5 KiB
C++
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s -O1 -disable-llvm-passes | FileCheck %s --check-prefix=ALL --check-prefix=O1
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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s -O0 | FileCheck %s --check-prefix=ALL --check-prefix=O0
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extern int global;
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int expect_taken(int x) {
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// ALL-LABEL: expect_taken
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// O1: call i64 @llvm.expect.with.probability.i64(i64 {{%.*}}, i64 1, double 9.000000e-01)
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// O0-NOT: @llvm.expect.with.probability
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if (__builtin_expect_with_probability(x == 100, 1, 0.9)) {
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return 0;
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}
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return x;
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}
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int expect_not_taken(int x) {
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// ALL-LABEL: expect_not_taken
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// O1: call i64 @llvm.expect.with.probability.i64(i64 {{%.*}}, i64 0, double 9.000000e-01)
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// O0-NOT: @llvm.expect.with.probability
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if (__builtin_expect_with_probability(x == 100, 0, 0.9)) {
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return 0;
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}
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return x;
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}
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struct S {
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static constexpr int prob = 1;
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};
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template<typename T>
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int expect_taken_template(int x) {
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// ALL-LABEL: expect_taken_template
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// O1: call i64 @llvm.expect.with.probability.i64(i64 {{%.*}}, i64 1, double 1.000000e+00)
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// O0-NOT: @llvm.expect.with.probability
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if (__builtin_expect_with_probability (x == 100, 1, T::prob)) {
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return 0;
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}
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return x;
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}
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int f() {
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return expect_taken_template<S>(global);
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}
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int x;
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extern "C" {
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int y(void);
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}
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void foo();
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void expect_value_side_effects() {
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// ALL-LABEL: expect_value_side_effects
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// ALL: [[CALL:%.*]] = call i32 @y
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// O1: [[SEXT:%.*]] = sext i32 [[CALL]] to i64
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// O1: call i64 @llvm.expect.with.probability.i64(i64 {{%.*}}, i64 [[SEXT]], double 6.000000e-01)
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// O0-NOT: @llvm.expect.with.probability
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if (__builtin_expect_with_probability(x, y(), 0.6))
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foo();
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}
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int switch_cond(int x) {
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// ALL-LABEL: switch_cond
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// O1: call i64 @llvm.expect.with.probability.i64(i64 {{%.*}}, i64 1, double 8.000000e-01)
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// O0-NOT: @llvm.expect.with.probability
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switch (__builtin_expect_with_probability(x, 1, 0.8)) {
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case 0:
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x = x + 0;
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case 1:
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x = x + 1;
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case 2:
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x = x + 2;
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case 5:
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x = x + 5;
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default:
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x = x + 6;
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}
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return x;
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}
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constexpr double prob = 0.8;
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int variable_expected(int stuff) {
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// ALL-LABEL: variable_expected
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// O1: call i64 @llvm.expect.with.probability.i64(i64 {{%.*}}, i64 {{%.*}}, double 8.000000e-01)
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// O0-NOT: @llvm.expect.with.probability
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int res = 0;
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switch(__builtin_expect_with_probability(stuff, stuff, prob)) {
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case 0:
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res = 1;
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break;
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default:
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break;
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}
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return res;
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}
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