; LLVM IR from Mohammed-Shoaib/Coding-Problems :: Gulf Programming Contest/2015/pisano/pisano.ll (Z6pisanoi)

; 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 i32 @_Z6pisanoi(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
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp eq i32 %8, 1
  br i1 %9, label %10, label %11

10:                                               ; preds = %1
  store i32 1, ptr %2, align 4
  br label %33

11:                                               ; preds = %1
  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
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  store i32 1, ptr %5, align 4, !tbaa !5
  store i32 3, ptr %7, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %25, %11
  br label %13

13:                                               ; preds = %12
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = add nsw i32 %14, %15
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = srem i32 %16, %17
  store i32 %18, ptr %6, align 4, !tbaa !5
  %19 = load i32, ptr %5, align 4, !tbaa !5
  %20 = icmp eq i32 %19, 0
  br i1 %20, label %21, label %25

21:                                               ; preds = %13
  %22 = load i32, ptr %6, align 4, !tbaa !5
  %23 = icmp eq i32 %22, 1
  br i1 %23, label %24, label %25

24:                                               ; preds = %21
  br label %30

25:                                               ; preds = %21, %13
  %26 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %26, ptr %4, align 4, !tbaa !5
  %27 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %27, ptr %5, align 4, !tbaa !5
  %28 = load i32, ptr %7, align 4, !tbaa !5
  %29 = add nsw i32 %28, 1
  store i32 %29, ptr %7, align 4, !tbaa !5
  br label %12, !llvm.loop !9

30:                                               ; preds = %24
  %31 = load i32, ptr %7, align 4, !tbaa !5
  %32 = sub nsw i32 %31, 2
  store i32 %32, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  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
  br label %33

33:                                               ; preds = %30, %10
  %34 = load i32, ptr %2, align 4
  ret i32 %34
}

; 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 = 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef range(i32 -2147483648, 2147483646) i32 @_Z6pisanoi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i32 %0, 1
  br i1 %2, label %10, label %.preheader

.preheader:                                       ; preds = %1, %.preheader
  %.014 = phi i32 [ %.013, %.preheader ], [ 0, %1 ]
  %.013 = phi i32 [ %4, %.preheader ], [ 1, %1 ]
  %.0 = phi i32 [ %7, %.preheader ], [ 3, %1 ]
  %3 = add nsw i32 %.013, %.014
  %4 = srem i32 %3, %0
  %5 = icmp eq i32 %.013, 0
  %6 = icmp eq i32 %4, 1
  %or.cond = select i1 %5, i1 %6, i1 false
  %7 = add nuw nsw i32 %.0, 1
  br i1 %or.cond, label %8, label %.preheader, !llvm.loop !5

8:                                                ; preds = %.preheader
  %9 = add nsw i32 %.0, -2
  br label %10

10:                                               ; preds = %1, %8
  %.012 = phi i32 [ %9, %8 ], [ 1, %1 ]
  ret i32 %.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: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass