; LLVM IR from fcimeson/cbTSP :: cbLKH/SRC (Random)

; 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"

@initialized = external hidden global i32, align 4
@a = external hidden global i32, align 4
@b = external hidden global i32, align 4
@arr = external hidden global [55 x i32], align 16

; Function Attrs: nounwind uwtable
declare dso_local i32 @Random() #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
define dso_local void @SRandom(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = urem i32 %7, 2147483647
  store i32 %8, ptr %2, align 4, !tbaa !5
  %9 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %9, ptr %5, align 4, !tbaa !5
  store i32 %9, ptr @arr, align 16, !tbaa !5
  store i32 1, ptr %3, align 4, !tbaa !5
  store i32 1, ptr %6, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %33, %1
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = icmp slt i32 %11, 55
  br i1 %12, label %13, label %36

13:                                               ; preds = %10
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = mul nsw i32 21, %14
  %16 = srem i32 %15, 55
  store i32 %16, ptr %4, align 4, !tbaa !5
  %17 = load i32, ptr %6, align 4, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [55 x i32], ptr @arr, i64 0, i64 %19
  store i32 %17, ptr %20, align 4, !tbaa !5
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = load i32, ptr %6, align 4, !tbaa !5
  %23 = sub nsw i32 %21, %22
  store i32 %23, ptr %6, align 4, !tbaa !5
  %24 = icmp slt i32 %23, 0
  br i1 %24, label %25, label %28

25:                                               ; preds = %13
  %26 = load i32, ptr %6, align 4, !tbaa !5
  %27 = add nsw i32 %26, 2147483647
  store i32 %27, ptr %6, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %25, %13
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [55 x i32], ptr @arr, i64 0, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !5
  store i32 %32, ptr %5, align 4, !tbaa !5
  br label %33

33:                                               ; preds = %28
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %3, align 4, !tbaa !5
  br label %10, !llvm.loop !9

36:                                               ; preds = %10
  store i32 1, ptr @initialized, align 4, !tbaa !5
  store i32 0, ptr @a, align 4, !tbaa !5
  store i32 24, ptr @b, align 4, !tbaa !5
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %37

37:                                               ; preds = %42, %36
  %38 = load i32, ptr %3, align 4, !tbaa !5
  %39 = icmp slt i32 %38, 165
  br i1 %39, label %40, label %45

40:                                               ; preds = %37
  %41 = call i32 @Random()
  br label %42

42:                                               ; preds = %40
  %43 = load i32, ptr %3, align 4, !tbaa !5
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %3, align 4, !tbaa !5
  br label %37, !llvm.loop !11

45:                                               ; preds = %37
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

@initialized = external hidden local_unnamed_addr global i32, align 4
@a = external hidden local_unnamed_addr global i32, align 4
@b = external hidden local_unnamed_addr global i32, align 4
@arr = external hidden local_unnamed_addr global [55 x i32], align 16

; Function Attrs: nounwind uwtable
declare dso_local i32 @Random() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @SRandom(i32 noundef %0) local_unnamed_addr #0 {
  %2 = urem i32 %0, 2147483647
  store i32 %2, ptr @arr, align 16, !tbaa !5
  br label %3

3:                                                ; preds = %3, %1
  %.020 = phi i32 [ 1, %1 ], [ %spec.select.1, %3 ]
  %.01319 = phi i32 [ %2, %1 ], [ %spec.select, %3 ]
  %.01418 = phi i32 [ 1, %1 ], [ %19, %3 ]
  %4 = trunc nuw i32 %.01418 to i16
  %.lhs.trunc = mul nuw nsw i16 %4, 21
  %5 = urem i16 %.lhs.trunc, 55
  %6 = zext nneg i16 %5 to i64
  %7 = getelementptr inbounds [55 x i32], ptr @arr, i64 0, i64 %6
  store i32 %.020, ptr %7, align 4, !tbaa !5
  %8 = sub nsw i32 %.01319, %.020
  %9 = icmp slt i32 %8, 0
  %10 = add nsw i32 %8, 2147483647
  %spec.select = select i1 %9, i32 %10, i32 %8
  %11 = trunc i32 %.01418 to i16
  %12 = mul i16 %11, 21
  %.lhs.trunc.1 = add i16 %12, 21
  %13 = urem i16 %.lhs.trunc.1, 55
  %14 = zext nneg i16 %13 to i64
  %15 = getelementptr inbounds [55 x i32], ptr @arr, i64 0, i64 %14
  store i32 %spec.select, ptr %15, align 4, !tbaa !5
  %16 = sub nsw i32 %.020, %spec.select
  %17 = icmp slt i32 %16, 0
  %18 = add nsw i32 %16, 2147483647
  %spec.select.1 = select i1 %17, i32 %18, i32 %16
  %19 = add nuw nsw i32 %.01418, 2
  %exitcond.not.1 = icmp eq i32 %19, 55
  br i1 %exitcond.not.1, label %20, label %3, !llvm.loop !9

20:                                               ; preds = %3
  store i32 1, ptr @initialized, align 4, !tbaa !5
  store i32 0, ptr @a, align 4, !tbaa !5
  store i32 24, ptr @b, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %20, %21
  %.11521 = phi i32 [ 0, %20 ], [ %23, %21 ]
  %22 = tail call i32 @Random()
  %23 = add nuw nsw i32 %.11521, 1
  %exitcond22.not = icmp eq i32 %23, 165
  br i1 %exitcond22.not, label %24, label %21, !llvm.loop !11

24:                                               ; preds = %21
  ret void
}

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" }

!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"}
!11 = distinct !{!11, !10}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass