; LLVM IR from Mohamed-Ouarar/C_piscine :: C03/ex04-ft_strstr (ft_strstr)

; 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
declare dso_local i32 @ft_len(ptr noundef) #0

; 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

; Function Attrs: nounwind uwtable
declare dso_local i32 @cmp(ptr noundef, ptr noundef, i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local ptr @ft_strstr(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %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 ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = call i32 @ft_len(ptr noundef %9)
  store i32 %10, ptr %7, align 4, !tbaa !9
  store i32 0, ptr %6, align 4, !tbaa !9
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = icmp eq i32 %11, 0
  br i1 %12, label %13, label %15

13:                                               ; preds = %2
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %14, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %54

15:                                               ; preds = %2
  br label %16

16:                                               ; preds = %50, %15
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i8, ptr %17, i64 %19
  %21 = load i8, ptr %20, align 1, !tbaa !11
  %22 = icmp ne i8 %21, 0
  br i1 %22, label %23, label %53

23:                                               ; preds = %16
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i8, ptr %24, i64 %26
  %28 = load i8, ptr %27, align 1, !tbaa !11
  %29 = sext i8 %28 to i32
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = getelementptr inbounds i8, ptr %30, i64 0
  %32 = load i8, ptr %31, align 1, !tbaa !11
  %33 = sext i8 %32 to i32
  %34 = icmp eq i32 %29, %33
  br i1 %34, label %35, label %50

35:                                               ; preds = %23
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  %37 = load i32, ptr %6, align 4, !tbaa !9
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds i8, ptr %36, i64 %38
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  %41 = load i32, ptr %7, align 4, !tbaa !9
  %42 = call i32 @cmp(ptr noundef %39, ptr noundef %40, i32 noundef %41)
  %43 = icmp eq i32 %42, 0
  br i1 %43, label %44, label %49

44:                                               ; preds = %35
  %45 = load ptr, ptr %4, align 8, !tbaa !5
  %46 = load i32, ptr %6, align 4, !tbaa !9
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds i8, ptr %45, i64 %47
  store ptr %48, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %54

49:                                               ; preds = %35
  br label %50

50:                                               ; preds = %49, %23
  %51 = load i32, ptr %6, align 4, !tbaa !9
  %52 = add nsw i32 %51, 1
  store i32 %52, ptr %6, align 4, !tbaa !9
  br label %16, !llvm.loop !12

53:                                               ; preds = %16
  store ptr null, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %54

54:                                               ; preds = %53, %44, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %55 = load ptr, ptr %3, align 8
  ret ptr %55
}

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 = !{!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: nounwind uwtable
declare dso_local i32 @ft_len(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @cmp(ptr noundef, ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @ft_strstr(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = tail call i32 @ft_len(ptr noundef %1)
  %4 = icmp eq i32 %3, 0
  br i1 %4, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %2
  %5 = load i8, ptr %0, align 1, !tbaa !5
  %.not17 = icmp eq i8 %5, 0
  br i1 %.not17, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %13
  %indvars.iv = phi i64 [ %indvars.iv.next, %13 ], [ 0, %.preheader ]
  %6 = phi i8 [ %15, %13 ], [ %5, %.preheader ]
  %7 = load i8, ptr %1, align 1, !tbaa !5
  %8 = icmp eq i8 %6, %7
  br i1 %8, label %9, label %13

9:                                                ; preds = %.lr.ph
  %10 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %11 = tail call i32 @cmp(ptr noundef nonnull %10, ptr noundef nonnull %1, i32 noundef %3)
  %12 = icmp eq i32 %11, 0
  br i1 %12, label %.loopexit, label %13

13:                                               ; preds = %9, %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %14 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  %15 = load i8, ptr %14, align 1, !tbaa !5
  %.not = icmp eq i8 %15, 0
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !8

.loopexit:                                        ; preds = %9, %13, %.preheader, %2
  %.0 = phi ptr [ %0, %2 ], [ null, %.preheader ], [ %10, %9 ], [ null, %13 ]
  ret ptr %.0
}

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" }

!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/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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