; LLVM IR from kenjin/Awesome-LC-C-Cracker :: leetcode-c-sol/0169_majority-element (0169_majority-element)

; 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 ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = 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
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds i32, ptr %8, i64 0
  %10 = load i32, ptr %9, align 4, !tbaa !9
  store i32 %10, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 1, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 1, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %40, %2
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %4, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %43

16:                                               ; preds = %11
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = load i32, ptr %7, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i32, ptr %17, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = load i32, ptr %5, align 4, !tbaa !9
  %23 = icmp eq i32 %21, %22
  br i1 %23, label %24, label %27

24:                                               ; preds = %16
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %6, align 4, !tbaa !9
  br label %39

27:                                               ; preds = %16
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = add nsw i32 %28, -1
  store i32 %29, ptr %6, align 4, !tbaa !9
  %30 = load i32, ptr %6, align 4, !tbaa !9
  %31 = icmp eq i32 %30, 0
  br i1 %31, label %32, label %38

32:                                               ; preds = %27
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds i32, ptr %33, i64 %35
  %37 = load i32, ptr %36, align 4, !tbaa !9
  store i32 %37, ptr %5, align 4, !tbaa !9
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %38

38:                                               ; preds = %32, %27
  br label %39

39:                                               ; preds = %38, %24
  br label %40

40:                                               ; preds = %39
  %41 = load i32, ptr %7, align 4, !tbaa !9
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !11

43:                                               ; preds = %15
  %44 = load i32, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %44
}

; 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 = load i32, ptr %0, align 4, !tbaa !5
  %4 = icmp sgt i32 %1, 1
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  %5 = add nsw i64 %wide.trip.count, -1
  %xtraiter = and i64 %5, 1
  %6 = icmp eq i32 %1, 2
  br i1 %6, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %5, -2
  %invariant.gep = getelementptr inbounds i8, ptr %0, i64 4
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa.loopexit:          ; preds = %26
  %7 = icmp eq i32 %.1.1, 1
  br label %._crit_edge.loopexit.unr-lcssa

._crit_edge.loopexit.unr-lcssa:                   ; preds = %._crit_edge.loopexit.unr-lcssa.loopexit, %.lr.ph.preheader
  %.114.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %.114.1, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %indvars.iv.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next.1, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %.01219.unr = phi i1 [ true, %.lr.ph.preheader ], [ %7, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %.01318.unr = phi i32 [ %3, %.lr.ph.preheader ], [ %.114.1, %._crit_edge.loopexit.unr-lcssa.loopexit ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa
  %8 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.unr
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp eq i32 %9, %.01318.unr
  %spec.select.epil = select i1 %.01219.unr, i32 %9, i32 %.01318.unr
  %.114.epil = select i1 %10, i32 %.01318.unr, i32 %spec.select.epil
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.epil, %._crit_edge.loopexit.unr-lcssa, %2
  %.013.lcssa = phi i32 [ %3, %2 ], [ %.114.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %.114.epil, %.lr.ph.epil ]
  ret i32 %.013.lcssa

.lr.ph:                                           ; preds = %26, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader.new ], [ %indvars.iv.next.1, %26 ]
  %.01219 = phi i32 [ 1, %.lr.ph.preheader.new ], [ %.1.1, %26 ]
  %.01318 = phi i32 [ %3, %.lr.ph.preheader.new ], [ %.114.1, %26 ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %26 ]
  %11 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = icmp eq i32 %12, %.01318
  br i1 %13, label %14, label %16

14:                                               ; preds = %.lr.ph
  %15 = add nsw i32 %.01219, 1
  br label %.lr.ph.1

16:                                               ; preds = %.lr.ph
  %17 = add nsw i32 %.01219, -1
  %18 = icmp eq i32 %17, 0
  %spec.select = select i1 %18, i32 %12, i32 %.01318
  %spec.select17 = tail call i32 @llvm.umax.i32(i32 %17, i32 1)
  br label %.lr.ph.1

.lr.ph.1:                                         ; preds = %16, %14
  %.114 = phi i32 [ %.01318, %14 ], [ %spec.select, %16 ]
  %.1 = phi i32 [ %15, %14 ], [ %spec.select17, %16 ]
  %gep = getelementptr inbounds i32, ptr %invariant.gep, i64 %indvars.iv
  %19 = load i32, ptr %gep, align 4, !tbaa !5
  %20 = icmp eq i32 %19, %.114
  br i1 %20, label %24, label %21

21:                                               ; preds = %.lr.ph.1
  %22 = add nsw i32 %.1, -1
  %23 = icmp eq i32 %22, 0
  %spec.select.1 = select i1 %23, i32 %19, i32 %.114
  %spec.select17.1 = tail call i32 @llvm.umax.i32(i32 %22, i32 1)
  br label %26

24:                                               ; preds = %.lr.ph.1
  %25 = add nsw i32 %.1, 1
  br label %26

26:                                               ; preds = %24, %21
  %.114.1 = phi i32 [ %.114, %24 ], [ %spec.select.1, %21 ]
  %.1.1 = phi i32 [ %25, %24 ], [ %spec.select17.1, %21 ]
  %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 %._crit_edge.loopexit.unr-lcssa.loopexit, label %.lr.ph, !llvm.loop !9
}

; 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,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass