61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
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// RUN: %clang_cc1 -O1 -disable-llvm-passes -emit-llvm %s -o - -triple=x86_64-linux-gnu -verify
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// RUN: %clang_cc1 -O1 -disable-llvm-passes -emit-llvm %s -o - -triple=x86_64-linux-gnu | FileCheck %s
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void wl(int e){
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// CHECK-LABEL: define{{.*}}wl
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// CHECK: br {{.*}} !prof !6
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while(e) [[likely]] ++e;
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}
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void wu(int e){
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// CHECK-LABEL: define{{.*}}wu
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// CHECK: br {{.*}} !prof !10
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while(e) [[unlikely]] ++e;
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}
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void w_branch_elided(unsigned e){
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// CHECK-LABEL: define{{.*}}w_branch_elided
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// CHECK-NOT: br {{.*}} !prof
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// expected-warning@+2 {{attribute 'likely' has no effect when annotating an infinite loop}}
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// expected-note@+1 {{annotating the infinite loop here}}
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while(1) [[likely]] ++e;
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}
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void fl(unsigned e)
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{
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// CHECK-LABEL: define{{.*}}fl
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// CHECK: br {{.*}} !prof !6
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for(int i = 0; i != e; ++e) [[likely]];
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}
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void fu(int e)
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{
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// CHECK-LABEL: define{{.*}}fu
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// CHECK: br {{.*}} !prof !10
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for(int i = 0; i != e; ++e) [[unlikely]];
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}
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void f_branch_elided()
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{
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// CHECK-LABEL: define{{.*}}f_branch_elided
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// CHECK-NOT: br {{.*}} !prof
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for(;;) [[likely]];
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}
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void frl(int (&&e) [4])
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{
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// CHECK-LABEL: define{{.*}}frl
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// CHECK: br {{.*}} !prof !6
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for(int i : e) [[likely]];
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}
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void fru(int (&&e) [4])
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{
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// CHECK-LABEL: define{{.*}}fru
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// CHECK: br {{.*}} !prof !10
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for(int i : e) [[unlikely]];
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}
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// CHECK: !6 = !{!"branch_weights", i32 2000, i32 1}
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// CHECK: !10 = !{!"branch_weights", i32 1, i32 2000}
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