| ; 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} |