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; 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}
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