; LLVM IR from vladpolisuk/algorithms :: Sorting/Shell Sort/code.ll (Z10shell_sortPii)

; 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: mustprogress nounwind uwtable
define dso_local void @_Z10shell_sortPii(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %9 = load i32, ptr %4, align 4, !tbaa !9
  %10 = sdiv i32 %9, 2
  store i32 %10, ptr %5, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %74, %2
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %14, label %77

14:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %15 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %15, ptr %6, align 4, !tbaa !9
  br label %16

16:                                               ; preds = %71, %14
  %17 = load i32, ptr %6, align 4, !tbaa !9
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = icmp slt i32 %17, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %74

21:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %22 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %22, ptr %7, align 4, !tbaa !9
  br label %23

23:                                               ; preds = %43, %21
  %24 = load i32, ptr %7, align 4, !tbaa !9
  %25 = load i32, ptr %5, align 4, !tbaa !9
  %26 = icmp sge i32 %24, %25
  br i1 %26, label %27, label %41

27:                                               ; preds = %23
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  %29 = load i32, ptr %7, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !9
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = load i32, ptr %5, align 4, !tbaa !9
  %36 = sub nsw i32 %34, %35
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds i32, ptr %33, i64 %37
  %39 = load i32, ptr %38, align 4, !tbaa !9
  %40 = icmp slt i32 %32, %39
  br label %41

41:                                               ; preds = %27, %23
  %42 = phi i1 [ false, %23 ], [ %40, %27 ]
  br i1 %42, label %43, label %70

43:                                               ; preds = %41
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %44 = load ptr, ptr %3, align 8, !tbaa !5
  %45 = load i32, ptr %7, align 4, !tbaa !9
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds i32, ptr %44, i64 %46
  %48 = load i32, ptr %47, align 4, !tbaa !9
  store i32 %48, ptr %8, align 4, !tbaa !9
  %49 = load ptr, ptr %3, align 8, !tbaa !5
  %50 = load i32, ptr %7, align 4, !tbaa !9
  %51 = load i32, ptr %5, align 4, !tbaa !9
  %52 = sub nsw i32 %50, %51
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds i32, ptr %49, i64 %53
  %55 = load i32, ptr %54, align 4, !tbaa !9
  %56 = load ptr, ptr %3, align 8, !tbaa !5
  %57 = load i32, ptr %7, align 4, !tbaa !9
  %58 = sext i32 %57 to i64
  %59 = getelementptr inbounds i32, ptr %56, i64 %58
  store i32 %55, ptr %59, align 4, !tbaa !9
  %60 = load i32, ptr %8, align 4, !tbaa !9
  %61 = load ptr, ptr %3, align 8, !tbaa !5
  %62 = load i32, ptr %7, align 4, !tbaa !9
  %63 = load i32, ptr %5, align 4, !tbaa !9
  %64 = sub nsw i32 %62, %63
  %65 = sext i32 %64 to i64
  %66 = getelementptr inbounds i32, ptr %61, i64 %65
  store i32 %60, ptr %66, align 4, !tbaa !9
  %67 = load i32, ptr %5, align 4, !tbaa !9
  %68 = load i32, ptr %7, align 4, !tbaa !9
  %69 = sub nsw i32 %68, %67
  store i32 %69, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %23, !llvm.loop !11

70:                                               ; preds = %41
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %71

71:                                               ; preds = %70
  %72 = load i32, ptr %6, align 4, !tbaa !9
  %73 = add nsw i32 %72, 1
  store i32 %73, ptr %6, align 4, !tbaa !9
  br label %16, !llvm.loop !13

74:                                               ; preds = %20
  %75 = load i32, ptr %5, align 4, !tbaa !9
  %76 = sdiv i32 %75, 2
  store i32 %76, ptr %5, align 4, !tbaa !9
  br label %11, !llvm.loop !14

77:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret void
}

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

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}
!14 = distinct !{!14, !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 @_Z10shell_sortPii(ptr nocapture noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %1, 1
  br i1 %3, label %.preheader31, label %._crit_edge37

.preheader31:                                     ; preds = %2, %._crit_edge
  %.036.in = phi i32 [ %.036, %._crit_edge ], [ %1, %2 ]
  %.036 = lshr i32 %.036.in, 1
  %4 = icmp slt i32 %.036, %1
  br i1 %4, label %.preheader, label %._crit_edge

.preheader:                                       ; preds = %.preheader31, %.critedge
  %.02835 = phi i32 [ %14, %.critedge ], [ %.036, %.preheader31 ]
  %.not32 = icmp ult i32 %.02835, %.036
  br i1 %.not32, label %.critedge, label %.lr.ph

._crit_edge:                                      ; preds = %.critedge, %.preheader31
  %.not38 = icmp ult i32 %.036.in, 4
  br i1 %.not38, label %._crit_edge37, label %.preheader31, !llvm.loop !5

.lr.ph:                                           ; preds = %.preheader, %13
  %.02733 = phi i32 [ %8, %13 ], [ %.02835, %.preheader ]
  %5 = zext nneg i32 %.02733 to i64
  %6 = getelementptr inbounds i32, ptr %0, i64 %5
  %7 = load i32, ptr %6, align 4, !tbaa !7
  %8 = sub nsw i32 %.02733, %.036
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds i32, ptr %0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !7
  %12 = icmp slt i32 %7, %11
  br i1 %12, label %13, label %.critedge

13:                                               ; preds = %.lr.ph
  store i32 %11, ptr %6, align 4, !tbaa !7
  store i32 %7, ptr %10, align 4, !tbaa !7
  %.not = icmp slt i32 %8, %.036
  br i1 %.not, label %.critedge, label %.lr.ph, !llvm.loop !11

.critedge:                                        ; preds = %.lr.ph, %13, %.preheader
  %14 = add nuw nsw i32 %.02835, 1
  %exitcond.not = icmp eq i32 %14, %1
  br i1 %exitcond.not, label %._crit_edge, label %.preheader, !llvm.loop !12

._crit_edge37:                                    ; preds = %._crit_edge, %2
  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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"int", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}
!11 = distinct !{!11, !6}
!12 = distinct !{!12, !6}


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