98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
// 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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// In all tests, make sure that no expect is generated if optimizations are off.
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// If optimizations are on, generate the correct expect and preserve other necessary operations.
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int expect_taken(int x) {
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// ALL-LABEL: define i32 @expect_taken
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// O1: call i64 @llvm.expect.i64(i64 {{%.*}}, i64 1)
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// O0-NOT: @llvm.expect
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if (__builtin_expect (x, 1))
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return 0;
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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: define i32 @expect_not_taken
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// O1: call i64 @llvm.expect.i64(i64 {{%.*}}, i64 0)
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// O0-NOT: @llvm.expect
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if (__builtin_expect (x, 0))
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return 0;
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return x;
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}
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int x;
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int y(void);
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void foo();
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void expect_value_side_effects() {
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// ALL-LABEL: define void @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.i64(i64 {{%.*}}, i64 [[SEXT]])
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// O0-NOT: @llvm.expect
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if (__builtin_expect (x, y()))
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foo ();
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}
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// Make sure that issigprocmask() is called before bar()?
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// There's no compare, so there's nothing to expect?
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// rdar://9330105
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void isigprocmask(void);
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long bar();
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int main() {
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// ALL-LABEL: define i32 @main()
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// ALL: call void @isigprocmask()
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// ALL: [[CALL:%.*]] = call i64 (...) @bar()
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// O1: call i64 @llvm.expect.i64(i64 0, i64 [[CALL]])
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// O0-NOT: @llvm.expect
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(void) __builtin_expect((isigprocmask(), 0), bar());
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}
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int switch_cond(int x) {
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// ALL-LABEL: define i32 @switch_cond
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// O1: call i64 @llvm.expect.i64(i64 {{%.*}}, i64 5)
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// O0-NOT: @llvm.expect
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switch(__builtin_expect(x, 5)) {
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default:
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return 0;
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case 0:
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case 1:
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case 2:
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return 1;
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case 5:
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return 5;
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};
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return 0;
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}
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int variable_expected(int stuff) {
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// ALL-LABEL: define i32 @variable_expected(
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// O1: call i64 @llvm.expect.i64(i64 {{%.*}}, i64 {{%.*}})
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// O0-NOT: @llvm.expect
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int res = 0;
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switch (__builtin_expect(stuff, stuff)) {
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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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