; LLVM IR from brpapa/algorithms :: solutions/uri/1127.ll (Z13calculaPrefixPiS_i)

; 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: 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: mustprogress nounwind uwtable
define dso_local void @_Z13calculaPrefixPiS_i(ptr noundef %0, ptr noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 -1, ptr %8, align 4, !tbaa !9
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = getelementptr inbounds i32, ptr %9, i64 0
  store i32 -1, ptr %10, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %39, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %15, label %47

15:                                               ; preds = %11
  br label %16

16:                                               ; preds = %33, %15
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = icmp sge i32 %17, 0
  br i1 %18, label %19, label %31

19:                                               ; preds = %16
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = load i32, ptr %7, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds i32, ptr %20, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !9
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = load i32, ptr %8, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i32, ptr %25, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !9
  %30 = icmp ne i32 %24, %29
  br label %31

31:                                               ; preds = %19, %16
  %32 = phi i1 [ false, %16 ], [ %30, %19 ]
  br i1 %32, label %33, label %39

33:                                               ; preds = %31
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = load i32, ptr %8, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i32, ptr %34, i64 %36
  %38 = load i32, ptr %37, align 4, !tbaa !9
  store i32 %38, ptr %8, align 4, !tbaa !9
  br label %16, !llvm.loop !11

39:                                               ; preds = %31
  %40 = load i32, ptr %8, align 4, !tbaa !9
  %41 = add nsw i32 %40, 1
  store i32 %41, ptr %8, align 4, !tbaa !9
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = load i32, ptr %7, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %7, align 4, !tbaa !9
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds i32, ptr %42, i64 %45
  store i32 %41, ptr %46, align 4, !tbaa !9
  br label %11, !llvm.loop !13

47:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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 memory(argmem: readwrite) uwtable
define dso_local void @_Z13calculaPrefixPiS_i(ptr nocapture noundef %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  store i32 -1, ptr %0, align 4, !tbaa !5
  %4 = icmp sgt i32 %2, 0
  br i1 %4, label %.preheader.preheader, label %._crit_edge

.preheader.preheader:                             ; preds = %3
  %wide.trip.count = zext nneg i32 %2 to i64
  br label %.preheader

.preheader:                                       ; preds = %.preheader.preheader, %.critedge
  %indvars.iv = phi i64 [ 0, %.preheader.preheader ], [ %indvars.iv.next, %.critedge ]
  %.017 = phi i32 [ -1, %.preheader.preheader ], [ %16, %.critedge ]
  %5 = icmp sgt i32 %.017, -1
  br i1 %5, label %.lr.ph, label %.critedge

.lr.ph:                                           ; preds = %.preheader
  %6 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv
  %7 = load i32, ptr %6, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %.lr.ph, %12
  %.113 = phi i32 [ %.017, %.lr.ph ], [ %14, %12 ]
  %9 = zext nneg i32 %.113 to i64
  %10 = getelementptr inbounds i32, ptr %1, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %.not = icmp eq i32 %7, %11
  br i1 %.not, label %.critedge, label %12

12:                                               ; preds = %8
  %13 = getelementptr inbounds i32, ptr %0, i64 %9
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = icmp sgt i32 %14, -1
  br i1 %15, label %8, label %.critedge, !llvm.loop !9

.critedge:                                        ; preds = %8, %12, %.preheader
  %.1.lcssa = phi i32 [ %.017, %.preheader ], [ %14, %12 ], [ %.113, %8 ]
  %16 = add nsw i32 %.1.lcssa, 1
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %17 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  store i32 %16, ptr %17, align 4, !tbaa !5
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.preheader, !llvm.loop !11

._crit_edge:                                      ; preds = %.critedge, %3
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(argmem: readwrite) 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


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