; LLVM IR from ravireddy07/cpp-book :: src/Coding-Blocks/PrimeVisits.ll (Z7isPrimei)

; 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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z7isPrimei(i32 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i32, align 4
  %4 = alloca i8, align 1
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp sle i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store i1 false, ptr %2, align 1
  br label %45

10:                                               ; preds = %1
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = icmp eq i32 %11, 1
  br i1 %12, label %13, label %14

13:                                               ; preds = %10
  store i1 false, ptr %2, align 1
  br label %45

14:                                               ; preds = %10
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = icmp eq i32 %15, 2
  br i1 %16, label %17, label %18

17:                                               ; preds = %14
  store i1 true, ptr %2, align 1
  br label %45

18:                                               ; preds = %14
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = and i32 %19, 1
  %21 = icmp eq i32 %20, 0
  br i1 %21, label %22, label %23

22:                                               ; preds = %18
  store i1 false, ptr %2, align 1
  br label %45

23:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 1, ptr %4) #2
  store i8 1, ptr %4, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 3, ptr %5, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %38, %23
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = load i32, ptr %5, align 4, !tbaa !5
  %27 = mul nsw i32 %25, %26
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = icmp sle i32 %27, %28
  br i1 %29, label %31, label %30

30:                                               ; preds = %24
  store i32 2, ptr %6, align 4
  br label %41

31:                                               ; preds = %24
  %32 = load i32, ptr %3, align 4, !tbaa !5
  %33 = load i32, ptr %5, align 4, !tbaa !5
  %34 = srem i32 %32, %33
  %35 = icmp eq i32 %34, 0
  br i1 %35, label %36, label %37

36:                                               ; preds = %31
  store i8 0, ptr %4, align 1, !tbaa !9
  store i32 2, ptr %6, align 4
  br label %41

37:                                               ; preds = %31
  br label %38

38:                                               ; preds = %37
  %39 = load i32, ptr %5, align 4, !tbaa !5
  %40 = add nsw i32 %39, 2
  store i32 %40, ptr %5, align 4, !tbaa !5
  br label %24, !llvm.loop !11

41:                                               ; preds = %36, %30
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %42

42:                                               ; preds = %41
  %43 = load i8, ptr %4, align 1, !tbaa !9, !range !13, !noundef !14
  %44 = trunc i8 %43 to i1
  store i1 %44, ptr %2, align 1
  store i32 1, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 1, ptr %4) #2
  br label %45

45:                                               ; preds = %42, %22, %17, %13, %9
  %46 = load i1, ptr %2, align 1
  ret i1 %46
}

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

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

attributes #0 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{i8 0, i8 2}
!14 = !{}


; 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef zeroext i1 @_Z7isPrimei(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 1
  br i1 %2, label %.loopexit, label %3

3:                                                ; preds = %1
  switch i32 %0, label %5 [
    i32 1, label %.loopexit
    i32 2, label %4
  ]

4:                                                ; preds = %3
  br label %.loopexit

5:                                                ; preds = %3
  %6 = and i32 %0, 1
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %5
  %.not14 = icmp ult i32 %0, 9
  br i1 %.not14, label %.loopexit, label %.lr.ph

8:                                                ; preds = %.lr.ph
  %9 = add nuw nsw i32 %.015, 2
  %10 = mul nuw nsw i32 %9, %9
  %.not = icmp sgt i32 %10, %0
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.lr.ph:                                           ; preds = %.preheader, %8
  %.015 = phi i32 [ %9, %8 ], [ 3, %.preheader ]
  %11 = urem i32 %0, %.015
  %.not18 = icmp ne i32 %11, 0
  br i1 %.not18, label %8, label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %8, %.preheader, %5, %3, %1, %4
  %.012 = phi i1 [ true, %4 ], [ false, %1 ], [ false, %3 ], [ false, %5 ], [ true, %.preheader ], [ %.not18, %8 ], [ %.not18, %.lr.ph ]
  ret i1 %.012
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass