; LLVM IR from bartobri/data-structures-c :: symbol-table/skip-list (st)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@lgN = external hidden global i32, align 4

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @STrandX() #1 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %4 = call i32 @rand() #3
  store i32 %4, ptr %3, align 4, !tbaa !5
  store i32 1, ptr %1, align 4, !tbaa !5
  store i32 2, ptr %2, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %15, %0
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 5
  br i1 %7, label %8, label %21

8:                                                ; preds = %5
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = sdiv i32 2147483647, %10
  %12 = icmp sgt i32 %9, %11
  br i1 %12, label %13, label %14

13:                                               ; preds = %8
  br label %21

14:                                               ; preds = %8
  br label %15

15:                                               ; preds = %14
  %16 = load i32, ptr %1, align 4, !tbaa !5
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %1, align 4, !tbaa !5
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = add nsw i32 %19, %18
  store i32 %20, ptr %2, align 4, !tbaa !5
  br label %5, !llvm.loop !9

21:                                               ; preds = %13, %5
  %22 = load i32, ptr %1, align 4, !tbaa !5
  %23 = load i32, ptr @lgN, align 4, !tbaa !5
  %24 = icmp sgt i32 %22, %23
  br i1 %24, label %25, label %27

25:                                               ; preds = %21
  %26 = load i32, ptr %1, align 4, !tbaa !5
  store i32 %26, ptr @lgN, align 4, !tbaa !5
  br label %27

27:                                               ; preds = %25, %21
  %28 = load i32, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  ret i32 %28
}

; Function Attrs: nounwind
declare i32 @rand() #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@lgN = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local i32 @STrandX() local_unnamed_addr #0 {
  %1 = tail call i32 @rand() #2
  %2 = icmp sgt i32 %1, 1073741823
  br i1 %2, label %9, label %3

3:                                                ; preds = %0
  %4 = icmp sgt i32 %1, 536870911
  br i1 %4, label %9, label %5

5:                                                ; preds = %3
  %6 = icmp sgt i32 %1, 268435455
  br i1 %6, label %9, label %7

7:                                                ; preds = %5
  %8 = icmp sgt i32 %1, 134217727
  %spec.select = select i1 %8, i32 4, i32 5
  br label %9

9:                                                ; preds = %7, %5, %3, %0
  %.0.lcssa = phi i32 [ 1, %0 ], [ 2, %3 ], [ 3, %5 ], [ %spec.select, %7 ]
  %10 = load i32, ptr @lgN, align 4, !tbaa !5
  %11 = icmp sgt i32 %.0.lcssa, %10
  br i1 %11, label %12, label %13

12:                                               ; preds = %9
  store i32 %.0.lcssa, ptr @lgN, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %12, %9
  ret i32 %.0.lcssa
}

; Function Attrs: nounwind
declare i32 @rand() local_unnamed_addr #1

attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopRotatePass,SROAPass,SimplifyCFGPass,TailCallElimPass