; Check that the unlikely branch is outlined. Override internal branch thresholds with -hotcoldsplit-cold-probability-denom ; RUN: opt -S -passes=hotcoldsplit < %s | FileCheck %s --check-prefixes=CHECK-OUTLINE,CHECK-NOOUTLINE-BAZ ; RUN: opt -S -passes=hotcoldsplit -hotcoldsplit-cold-probability-denom=50 < %s | FileCheck --check-prefixes=CHECK-OUTLINE,CHECK-PROB %s ; int cold(const char*); ; int hot(const char*); ; void foo(int a, int b) { ; if (a == b) [[unlikely]] { // Should be outlined. ; cold("same"); ; cold("same"); ; } else { ; hot("different"); ; } ; } ; void bar(int a, int b) { ; if (a == b) [[likely]] { ; hot("same"); ; } else { // Should be outlined. ; cold("different"); ; cold("different"); ; } ; } ; void baz(int a, int b) { ; if (a == b) [[likely]] { ; hot("same"); ; } else { // Should be outlined. ; cold("different"); ; cold("different"); ; } ; } ; All the outlined cold functions are emitted after the hot functions. ; CHECK-OUTLINE: @foo ; CHECK-OUTLINE: @bar ; CHECK-OUTLINE: @baz ; CHECK-OUTLINE: internal void @foo.cold.1() #[[ATTR0:[0-9]+]] ; CHECK-OUTLINE-NEXT: newFuncRoot ; CHECK-OUTLINE: tail call noundef i32 @cold ; CHECK-OUTLINE: tail call noundef i32 @cold ; CHECK-OUTLINE: internal void @bar.cold.1() #[[ATTR0:[0-9]+]] ; CHECK-OUTLINE-NEXT: newFuncRoot ; CHECK-OUTLINE: tail call noundef i32 @cold ; CHECK-OUTLINE: tail call noundef i32 @cold ; CHECK-NOOUTLINE-BAZ-NOT: internal void @baz.cold.1() ; CHECK-PROB: internal void @baz.cold.1() #[[ATTR0:[0-9]+]] ; CHECK-PROB-NEXT: newFuncRoot ; CHECK-PROB: tail call noundef i32 @cold ; CHECK-PROB: tail call noundef i32 @cold ; CHECK-OUTLINE: attributes #[[ATTR0]] = { cold minsize } source_filename = "/app/example.cpp" target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-unknown-linux-gnu" @.str = private unnamed_addr constant [5 x i8] c"same\00", align 1 @.str.1 = private unnamed_addr constant [10 x i8] c"different\00", align 1 define dso_local void @foo(i32 noundef %a, i32 noundef %b) local_unnamed_addr { entry: %cmp = icmp eq i32 %a, %b br i1 %cmp, label %if.then, label %if.else, !prof !1 if.then: %call = tail call noundef i32 @cold(ptr noundef nonnull @.str) %call1 = tail call noundef i32 @cold(ptr noundef nonnull @.str) br label %if.end if.else: %call2 = tail call noundef i32 @hot(ptr noundef nonnull @.str.1) br label %if.end if.end: ret void } declare noundef i32 @cold(ptr noundef) local_unnamed_addr #1 declare noundef i32 @hot(ptr noundef) local_unnamed_addr #1 define dso_local void @bar(i32 noundef %a, i32 noundef %b) local_unnamed_addr { entry: %cmp = icmp eq i32 %a, %b br i1 %cmp, label %if.then, label %if.else, !prof !2 if.then: %call = tail call noundef i32 @hot(ptr noundef nonnull @.str) br label %if.end if.else: %call1 = tail call noundef i32 @cold(ptr noundef nonnull @.str.1) %call2 = tail call noundef i32 @cold(ptr noundef nonnull @.str.1) br label %if.end if.end: ret void } define dso_local void @baz(i32 noundef %a, i32 noundef %b) local_unnamed_addr { entry: %cmp = icmp eq i32 %a, %b br i1 %cmp, label %if.then, label %if.else, !prof !3 if.then: %call = tail call noundef i32 @hot(ptr noundef nonnull @.str) br label %if.end if.else: %call1 = tail call noundef i32 @cold(ptr noundef nonnull @.str.1) %call2 = tail call noundef i32 @cold(ptr noundef nonnull @.str.1) br label %if.end if.end: ret void } !1 = !{!"branch_weights", i32 1, i32 2000} !2 = !{!"branch_weights", i32 2000, i32 1} !3 = !{!"branch_weights", i32 50, i32 1}