; LLVM IR from codemistic/Data-Structures-and-Algorithms :: CPP/String/angramSearch.ll (Z6isSamePiS_)

; 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: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z6isSamePiS_(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %26, %2
  %9 = load i32, ptr %6, align 4, !tbaa !9
  %10 = icmp slt i32 %9, 256
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  store i32 2, ptr %7, align 4
  br label %29

12:                                               ; preds = %8
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = load i32, ptr %6, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds i32, ptr %13, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !9
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i32, ptr %18, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !9
  %23 = icmp ne i32 %17, %22
  br i1 %23, label %24, label %25

24:                                               ; preds = %12
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %29

25:                                               ; preds = %12
  br label %26

26:                                               ; preds = %25
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %6, align 4, !tbaa !9
  br label %8, !llvm.loop !11

29:                                               ; preds = %24, %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %30 = load i32, ptr %7, align 4
  switch i32 %30, label %34 [
    i32 2, label %31
    i32 1, label %32
  ]

31:                                               ; preds = %29
  store i1 true, ptr %3, align 1
  br label %32

32:                                               ; preds = %31, %29
  %33 = load i1, ptr %3, align 1
  ret i1 %33

34:                                               ; preds = %29
  unreachable
}

; 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 = { 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 #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++ 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: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef zeroext i1 @_Z6isSamePiS_(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = load i32, ptr %0, align 4, !tbaa !5
  %4 = load i32, ptr %1, align 4, !tbaa !5
  %.not10 = icmp eq i32 %3, %4
  br i1 %.not10, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %17
  %indvars.iv11 = phi i64 [ %indvars.iv.next.3, %17 ], [ 0, %2 ]
  %indvars.iv.next = or disjoint i64 %indvars.iv11, 1
  %5 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %.not = icmp eq i32 %6, %8
  br i1 %.not, label %.lr.ph.1, label %._crit_edge, !llvm.loop !9

.lr.ph.1:                                         ; preds = %.lr.ph
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv11, 2
  %9 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next.1
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next.1
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %.not.1 = icmp eq i32 %10, %12
  br i1 %.not.1, label %.lr.ph.2, label %._crit_edge, !llvm.loop !9

.lr.ph.2:                                         ; preds = %.lr.ph.1
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv11, 3
  %13 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next.2
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next.2
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %.not.2 = icmp eq i32 %14, %16
  br i1 %.not.2, label %.lr.ph.3, label %._crit_edge, !llvm.loop !9

.lr.ph.3:                                         ; preds = %.lr.ph.2
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv11, 4
  %exitcond.3 = icmp eq i64 %indvars.iv.next.3, 256
  br i1 %exitcond.3, label %._crit_edge.loopexit.split.loop.exit15, label %17, !llvm.loop !9

17:                                               ; preds = %.lr.ph.3
  %18 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next.3
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next.3
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %.not.3 = icmp eq i32 %19, %21
  br i1 %.not.3, label %.lr.ph, label %._crit_edge.loopexit.split.loop.exit, !llvm.loop !9

._crit_edge.loopexit.split.loop.exit:             ; preds = %17
  %22 = icmp ugt i64 %indvars.iv.next.2, 254
  br label %._crit_edge

._crit_edge.loopexit.split.loop.exit15:           ; preds = %.lr.ph.3
  %23 = icmp ugt i64 %indvars.iv.next.2, 254
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit.split.loop.exit, %._crit_edge.loopexit.split.loop.exit15, %.lr.ph.2, %.lr.ph.1, %.lr.ph, %2
  %.lcssa = phi i1 [ false, %2 ], [ %22, %._crit_edge.loopexit.split.loop.exit ], [ %23, %._crit_edge.loopexit.split.loop.exit15 ], [ false, %.lr.ph.2 ], [ false, %.lr.ph.1 ], [ false, %.lr.ph ]
  ret i1 %.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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" }

!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: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass