; LLVM IR from JessonYue/LeetCodeLearning :: Array/luoyida (7月第二周作业)

; 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"

@.str = external hidden unnamed_addr constant [3 x i8], align 1
@__const.main.a = external hidden unnamed_addr constant [12 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca [12 x i8], align 1
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 23, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %10, %0
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = icmp sgt i32 %8, 0
  br i1 %9, label %10, label %17

10:                                               ; preds = %7
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = sub nsw i32 %12, 1
  %14 = and i32 %11, %13
  store i32 %14, ptr %2, align 4, !tbaa !5
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr %3, align 4, !tbaa !5
  br label %7, !llvm.loop !9

17:                                               ; preds = %7
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %18)
  call void @llvm.lifetime.start.p0(i64 12, ptr %4) #5
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %4, ptr align 1 @__const.main.a, i64 12, i1 false)
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %20 = getelementptr inbounds [12 x i8], ptr %4, i64 0, i64 0
  store ptr %20, ptr %5, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #5
  %21 = getelementptr inbounds [12 x i8], ptr %4, i64 0, i64 0
  store ptr %21, ptr %6, align 8, !tbaa !11
  br label %22

22:                                               ; preds = %27, %17
  %23 = load ptr, ptr %6, align 8, !tbaa !11
  %24 = load i8, ptr %23, align 1, !tbaa !13
  %25 = sext i8 %24 to i32
  %26 = icmp ne i32 %25, 0
  br i1 %26, label %27, label %30

27:                                               ; preds = %22
  %28 = load ptr, ptr %6, align 8, !tbaa !11
  %29 = getelementptr inbounds i8, ptr %28, i32 1
  store ptr %29, ptr %6, align 8, !tbaa !11
  br label %22, !llvm.loop !14

30:                                               ; preds = %22
  %31 = load ptr, ptr %5, align 8, !tbaa !11
  %32 = load ptr, ptr %6, align 8, !tbaa !11
  %33 = getelementptr inbounds i8, ptr %32, i32 -1
  store ptr %33, ptr %6, align 8, !tbaa !11
  call void @_Z4swapPcS_(ptr noundef %31, ptr noundef %33)
  %34 = load ptr, ptr %5, align 8, !tbaa !11
  %35 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, ptr noundef %34)
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  call void @llvm.lifetime.end.p0(i64 12, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  %36 = load i32, ptr %1, align 4
  ret i32 %36
}

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

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4swapPcS_(ptr noundef, ptr noundef) #4

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

attributes #0 = { mustprogress norecurse 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 = { "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 #3 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { mustprogress 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 #5 = { 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"}
!11 = !{!12, !12, i64 0}
!12 = !{!"any pointer", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !10}


; 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"

@.str = external hidden unnamed_addr constant [3 x i8], align 1
@__const.main.a = external hidden unnamed_addr constant [12 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca [12 x i8], align 1
  %2 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef 4)
  call void @llvm.lifetime.start.p0(i64 12, ptr nonnull %1) #5
  call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 1 dereferenceable(12) %1, ptr noundef nonnull align 1 dereferenceable(12) @__const.main.a, i64 12, i1 false)
  br label %3

3:                                                ; preds = %3, %0
  %.0 = phi ptr [ %1, %0 ], [ %5, %3 ]
  %4 = load i8, ptr %.0, align 1, !tbaa !5
  %.not = icmp eq i8 %4, 0
  %5 = getelementptr inbounds i8, ptr %.0, i64 1
  br i1 %.not, label %6, label %3, !llvm.loop !8

6:                                                ; preds = %3
  %7 = getelementptr inbounds i8, ptr %.0, i64 -1
  call void @_Z4swapPcS_(ptr noundef nonnull %1, ptr noundef nonnull %7)
  %8 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, ptr noundef nonnull %1)
  call void @llvm.lifetime.end.p0(i64 12, ptr nonnull %1) #5
  ret i32 0
}

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

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4swapPcS_(ptr noundef, ptr noundef) local_unnamed_addr #4

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

attributes #0 = { mustprogress norecurse 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nofree nounwind "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 #3 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { mustprogress 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 #5 = { 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopUnrollPass,ReassociatePass,SROAPass,TailCallElimPass