; LLVM IR from TheAlgorithms/C-Plus-Plus :: strings/boyer_moore.ll (ZN7strings11boyer_moore9is_prefixEPKcS2_m)

; 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: 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 zeroext i1 @_ZN7strings11boyer_moore9is_prefixEPKcS2_m(ptr noundef %0, ptr noundef %1, i64 noundef %2) #1 {
  %4 = alloca i1, align 1
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i64 %2, ptr %7, align 8, !tbaa !9
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = call i64 @strlen(ptr noundef %10) #3
  %12 = load i64, ptr %7, align 8, !tbaa !9
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %14, label %15

14:                                               ; preds = %3
  store i1 false, ptr %4, align 1
  br label %41

15:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  store i64 0, ptr %8, align 8, !tbaa !9
  br label %16

16:                                               ; preds = %35, %15
  %17 = load i64, ptr %8, align 8, !tbaa !9
  %18 = load i64, ptr %7, align 8, !tbaa !9
  %19 = icmp ult i64 %17, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %16
  store i32 2, ptr %9, align 4
  br label %38

21:                                               ; preds = %16
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load i64, ptr %8, align 8, !tbaa !9
  %24 = getelementptr inbounds i8, ptr %22, i64 %23
  %25 = load i8, ptr %24, align 1, !tbaa !11
  %26 = sext i8 %25 to i32
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = load i64, ptr %8, align 8, !tbaa !9
  %29 = getelementptr inbounds i8, ptr %27, i64 %28
  %30 = load i8, ptr %29, align 1, !tbaa !11
  %31 = sext i8 %30 to i32
  %32 = icmp ne i32 %26, %31
  br i1 %32, label %33, label %34

33:                                               ; preds = %21
  store i1 false, ptr %4, align 1
  store i32 1, ptr %9, align 4
  br label %38

34:                                               ; preds = %21
  br label %35

35:                                               ; preds = %34
  %36 = load i64, ptr %8, align 8, !tbaa !9
  %37 = add i64 %36, 1
  store i64 %37, ptr %8, align 8, !tbaa !9
  br label %16, !llvm.loop !12

38:                                               ; preds = %33, %20
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  %39 = load i32, ptr %9, align 4
  switch i32 %39, label %43 [
    i32 2, label %40
    i32 1, label %41
  ]

40:                                               ; preds = %38
  store i1 true, ptr %4, align 1
  br label %41

41:                                               ; preds = %40, %38, %14
  %42 = load i1, ptr %4, align 1
  ret i1 %42

43:                                               ; preds = %38
  unreachable
}

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #2

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 willreturn memory(read) "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 = { nounwind willreturn memory(read) }
attributes #4 = { 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 = !{!"long", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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 nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef zeroext i1 @_ZN7strings11boyer_moore9is_prefixEPKcS2_m(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %0) #2
  %5 = icmp ult i64 %4, %2
  br i1 %5, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %3
  %6 = icmp eq i64 %2, 0
  br i1 %6, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.preheader
  %.01013 = phi i64 [ 0, %.preheader ], [ %11, %.lr.ph ]
  %7 = getelementptr inbounds i8, ptr %0, i64 %.01013
  %8 = load i8, ptr %7, align 1, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %1, i64 %.01013
  %10 = load i8, ptr %9, align 1, !tbaa !5
  %.not = icmp eq i8 %8, %10
  %.not.not = xor i1 %.not, true
  %11 = add nuw i64 %.01013, 1
  %exitcond = icmp eq i64 %11, %2
  %or.cond = select i1 %.not.not, i1 true, i1 %exitcond
  br i1 %or.cond, label %.loopexit, label %.lr.ph, !llvm.loop !8

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %3
  %.1 = phi i1 [ false, %3 ], [ true, %.preheader ], [ %.not, %.lr.ph ]
  ret i1 %.1
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #1

attributes #0 = { mustprogress nofree 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" }
attributes #1 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 willreturn memory(read) }

!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: ConstraintEliminationPass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass