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