; LLVM IR from upupming/algorithm :: leetcode/残酷刷题/1707. Maximum XOR With an Element From Array.ll (Z7max_xori)

; 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"

@trie = external dso_local global [3200010 x [2 x i32]], align 16

; 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 noundef i32 @_Z7max_xori(i32 noundef %0) #1 {
  %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 %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 1, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 31, ptr %6, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %57, %1
  %9 = load i32, ptr %6, align 4, !tbaa !5
  %10 = icmp sge i32 %9, 0
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %60

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = load i32, ptr %6, align 4, !tbaa !5
  %15 = ashr i32 %13, %14
  %16 = and i32 %15, 1
  store i32 %16, ptr %7, align 4, !tbaa !5
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [3200010 x [2 x i32]], ptr @trie, i64 0, i64 %18
  %20 = load i32, ptr %7, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [2 x i32], ptr %19, i64 0, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !5
  store i32 %23, ptr %3, align 4, !tbaa !5
  %24 = load i32, ptr %4, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [3200010 x [2 x i32]], ptr @trie, i64 0, i64 %25
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = icmp ne i32 %27, 0
  %29 = xor i1 %28, true
  %30 = zext i1 %29 to i64
  %31 = getelementptr inbounds [2 x i32], ptr %26, i64 0, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = icmp ne i32 %32, 0
  br i1 %33, label %34, label %48

34:                                               ; preds = %12
  %35 = load i32, ptr %4, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [3200010 x [2 x i32]], ptr @trie, i64 0, i64 %36
  %38 = load i32, ptr %7, align 4, !tbaa !5
  %39 = icmp ne i32 %38, 0
  %40 = xor i1 %39, true
  %41 = zext i1 %40 to i64
  %42 = getelementptr inbounds [2 x i32], ptr %37, i64 0, i64 %41
  %43 = load i32, ptr %42, align 4, !tbaa !5
  store i32 %43, ptr %4, align 4, !tbaa !5
  %44 = load i32, ptr %6, align 4, !tbaa !5
  %45 = shl i32 1, %44
  %46 = load i32, ptr %5, align 4, !tbaa !5
  %47 = or i32 %46, %45
  store i32 %47, ptr %5, align 4, !tbaa !5
  br label %56

48:                                               ; preds = %12
  %49 = load i32, ptr %4, align 4, !tbaa !5
  %50 = sext i32 %49 to i64
  %51 = getelementptr inbounds [3200010 x [2 x i32]], ptr @trie, i64 0, i64 %50
  %52 = load i32, ptr %7, align 4, !tbaa !5
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds [2 x i32], ptr %51, i64 0, i64 %53
  %55 = load i32, ptr %54, align 4, !tbaa !5
  store i32 %55, ptr %4, align 4, !tbaa !5
  br label %56

56:                                               ; preds = %48, %34
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %57

57:                                               ; preds = %56
  %58 = load i32, ptr %6, align 4, !tbaa !5
  %59 = add nsw i32 %58, -1
  store i32 %59, ptr %6, align 4, !tbaa !5
  br label %8, !llvm.loop !9

60:                                               ; preds = %11
  %61 = load i32, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %61
}

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 = !{!"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"

@trie = external dso_local local_unnamed_addr global [3200010 x [2 x i32]], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z7max_xori(i32 noundef %0) local_unnamed_addr #0 {
  br label %3

2:                                                ; preds = %18
  ret i32 %.1

3:                                                ; preds = %1, %18
  %.01522 = phi i32 [ 31, %1 ], [ %19, %18 ]
  %.01621 = phi i32 [ 0, %1 ], [ %.1, %18 ]
  %.01720 = phi i32 [ 1, %1 ], [ %.118, %18 ]
  %4 = lshr i32 %0, %.01522
  %5 = and i32 %4, 1
  %6 = sext i32 %.01720 to i64
  %7 = xor i32 %5, 1
  %8 = zext nneg i32 %7 to i64
  %9 = getelementptr inbounds [3200010 x [2 x i32]], ptr @trie, i64 0, i64 %6, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %.not = icmp eq i32 %10, 0
  br i1 %.not, label %14, label %11

11:                                               ; preds = %3
  %12 = shl nuw i32 1, %.01522
  %13 = or i32 %12, %.01621
  br label %18

14:                                               ; preds = %3
  %15 = zext nneg i32 %5 to i64
  %16 = getelementptr inbounds [3200010 x [2 x i32]], ptr @trie, i64 0, i64 %6, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  br label %18

18:                                               ; preds = %14, %11
  %.118 = phi i32 [ %10, %11 ], [ %17, %14 ]
  %.1 = phi i32 [ %13, %11 ], [ %.01621, %14 ]
  %19 = add nsw i32 %.01522, -1
  %.not24 = icmp eq i32 %.01522, 0
  br i1 %.not24, label %2, label %3, !llvm.loop !9
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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