; LLVM IR from int32bit/leetcode :: algorithms/MajorityElement (solve)

; 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 i32 @majorityElement(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %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 i32 %1, ptr %5, align 4, !tbaa !9
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp slt i32 %9, 2
  br i1 %10, label %11, label %15

11:                                               ; preds = %2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = getelementptr inbounds i32, ptr %12, i64 0
  %14 = load i32, ptr %13, align 4, !tbaa !9
  store i32 %14, ptr %3, align 4
  br label %53

15:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = getelementptr inbounds i32, ptr %16, i64 0
  %18 = load i32, ptr %17, align 4, !tbaa !9
  store i32 %18, 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 0, ptr %8, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %48, %15
  %20 = load i32, ptr %8, align 4, !tbaa !9
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = icmp slt i32 %20, %21
  br i1 %22, label %24, label %23

23:                                               ; preds = %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %51

24:                                               ; preds = %19
  %25 = load ptr, ptr %4, 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 = load i32, ptr %6, align 4, !tbaa !9
  %31 = icmp eq i32 %29, %30
  br i1 %31, label %32, label %35

32:                                               ; preds = %24
  %33 = load i32, ptr %7, align 4, !tbaa !9
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %7, align 4, !tbaa !9
  br label %38

35:                                               ; preds = %24
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = add nsw i32 %36, -1
  store i32 %37, ptr %7, align 4, !tbaa !9
  br label %38

38:                                               ; preds = %35, %32
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = icmp eq i32 %39, 0
  br i1 %40, label %41, label %47

41:                                               ; preds = %38
  store i32 1, ptr %7, align 4, !tbaa !9
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = load i32, ptr %8, align 4, !tbaa !9
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds i32, ptr %42, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !9
  store i32 %46, ptr %6, align 4, !tbaa !9
  br label %47

47:                                               ; preds = %41, %38
  br label %48

48:                                               ; preds = %47
  %49 = load i32, ptr %8, align 4, !tbaa !9
  %50 = add nsw i32 %49, 1
  store i32 %50, ptr %8, align 4, !tbaa !9
  br label %19, !llvm.loop !11

51:                                               ; preds = %23
  %52 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %52, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %53

53:                                               ; preds = %51, %11
  %54 = load i32, ptr %3, align 4
  ret i32 %54
}

; 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 = distinct !{!11, !12}
!12 = !{!"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(argmem: read) uwtable
define dso_local i32 @majorityElement(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %1, 2
  %4 = load i32, ptr %0, align 4, !tbaa !5
  br i1 %3, label %.loopexit, label %.new

.new:                                             ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  %xtraiter = and i64 %wide.trip.count, 1
  %unroll_iter = and i64 %wide.trip.count, 2147483646
  br label %5

5:                                                ; preds = %5, %.new
  %indvars.iv = phi i64 [ 0, %.new ], [ %indvars.iv.next.1, %5 ]
  %.01522 = phi i32 [ 0, %.new ], [ %spec.select20.1, %5 ]
  %.01621 = phi i32 [ %4, %.new ], [ %spec.select.1, %5 ]
  %niter = phi i64 [ 0, %.new ], [ %niter.next.1, %5 ]
  %6 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = icmp eq i32 %7, %.01621
  %.1.v = select i1 %8, i32 1, i32 -1
  %.1 = add nsw i32 %.1.v, %.01522
  %9 = icmp eq i32 %.1, 0
  %spec.select = select i1 %9, i32 %7, i32 %.01621
  %spec.select20 = tail call i32 @llvm.umax.i32(i32 %.1, i32 1)
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %10 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = icmp eq i32 %11, %spec.select
  %.1.v.1 = select i1 %12, i32 1, i32 -1
  %.1.1 = add nsw i32 %.1.v.1, %spec.select20
  %13 = icmp eq i32 %.1.1, 0
  %spec.select.1 = select i1 %13, i32 %11, i32 %spec.select
  %spec.select20.1 = tail call i32 @llvm.umax.i32(i32 %.1.1, i32 1)
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %.loopexit.loopexit.unr-lcssa, label %5, !llvm.loop !9

.loopexit.loopexit.unr-lcssa:                     ; preds = %5
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.loopexit, label %.loopexit.loopexit.epilog-lcssa

.loopexit.loopexit.epilog-lcssa:                  ; preds = %.loopexit.loopexit.unr-lcssa
  %14 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next.1
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = icmp eq i32 %15, %spec.select.1
  %.1.v.epil = select i1 %16, i32 1, i32 -1
  %.1.epil = sub i32 0, %spec.select20.1
  %17 = icmp eq i32 %.1.v.epil, %.1.epil
  %spec.select.epil = select i1 %17, i32 %15, i32 %spec.select.1
  br label %.loopexit

.loopexit:                                        ; preds = %.loopexit.loopexit.epilog-lcssa, %.loopexit.loopexit.unr-lcssa, %2
  %.018 = phi i32 [ %4, %2 ], [ %spec.select.1, %.loopexit.loopexit.unr-lcssa ], [ %spec.select.epil, %.loopexit.loopexit.epilog-lcssa ]
  ret i32 %.018
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.umax.i32(i32, i32) #1

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 speculatable willreturn memory(none) }

!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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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