; LLVM IR from h-ssiqueira/Sort_Algorithms :: src/exchange (gnomeSort)

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

9:                                                ; preds = %44, %2
  %10 = load ptr, ptr %6, align 8, !tbaa !5
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds i64, ptr %11, i64 %13
  %15 = icmp ult ptr %10, %14
  br i1 %15, label %16, label %45

16:                                               ; preds = %9
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = load i64, ptr %17, align 8, !tbaa !11
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = getelementptr inbounds i64, ptr %19, i64 -1
  %21 = load i64, ptr %20, align 8, !tbaa !11
  %22 = icmp sge i64 %18, %21
  br i1 %22, label %23, label %26

23:                                               ; preds = %16
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = getelementptr inbounds i64, ptr %24, i32 1
  store ptr %25, ptr %6, align 8, !tbaa !5
  br label %44

26:                                               ; preds = %16
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = load i64, ptr %27, align 8, !tbaa !11
  store i64 %28, ptr %5, align 8, !tbaa !11
  %29 = load ptr, ptr %6, align 8, !tbaa !5
  %30 = getelementptr inbounds i64, ptr %29, i64 -1
  %31 = load i64, ptr %30, align 8, !tbaa !11
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  store i64 %31, ptr %32, align 8, !tbaa !11
  %33 = load i64, ptr %5, align 8, !tbaa !11
  %34 = load ptr, ptr %6, align 8, !tbaa !5
  %35 = getelementptr inbounds i64, ptr %34, i64 -1
  store i64 %33, ptr %35, align 8, !tbaa !11
  %36 = load ptr, ptr %6, align 8, !tbaa !5
  %37 = load ptr, ptr %3, align 8, !tbaa !5
  %38 = getelementptr inbounds i64, ptr %37, i64 1
  %39 = icmp ne ptr %36, %38
  br i1 %39, label %40, label %43

40:                                               ; preds = %26
  %41 = load ptr, ptr %6, align 8, !tbaa !5
  %42 = getelementptr inbounds i64, ptr %41, i32 -1
  store ptr %42, ptr %6, align 8, !tbaa !5
  br label %43

43:                                               ; preds = %40, %26
  br label %44

44:                                               ; preds = %43, %23
  br label %9, !llvm.loop !13

45:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret void
}

; 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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @gnomeSort(ptr nocapture noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = sext i32 %1 to i64
  %.idx = shl nsw i64 %3, 3
  %4 = icmp sgt i32 %1, 1
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %.0.ptr20 = getelementptr inbounds i8, ptr %0, i64 8
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %9
  %.0.ptr22 = phi ptr [ %.0.ptr, %9 ], [ %.0.ptr20, %.lr.ph.preheader ]
  %.0.idx21 = phi i64 [ %.1.idx, %9 ], [ 8, %.lr.ph.preheader ]
  %5 = load i64, ptr %.0.ptr22, align 8, !tbaa !5
  %.0.add = add nsw i64 %.0.idx21, -8
  %.ptr18 = getelementptr inbounds i8, ptr %0, i64 %.0.add
  %6 = load i64, ptr %.ptr18, align 8, !tbaa !5
  %.not = icmp slt i64 %5, %6
  br i1 %.not, label %8, label %7

7:                                                ; preds = %.lr.ph
  %.0.add17 = add nsw i64 %.0.idx21, 8
  br label %9

8:                                                ; preds = %.lr.ph
  store i64 %6, ptr %.0.ptr22, align 8, !tbaa !5
  store i64 %5, ptr %.ptr18, align 8, !tbaa !5
  %.not16 = icmp eq i64 %.0.idx21, 8
  %spec.select = select i1 %.not16, i64 8, i64 %.0.add
  br label %9

9:                                                ; preds = %8, %7
  %.1.idx = phi i64 [ %.0.add17, %7 ], [ %spec.select, %8 ]
  %.0.ptr = getelementptr inbounds i8, ptr %0, i64 %.1.idx
  %10 = icmp slt i64 %.1.idx, %.idx
  br i1 %10, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %9, %2
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: 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 = !{!6, !6, i64 0}
!6 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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