; LLVM IR from JessonYue/LeetCodeLearning :: Array/linchuanxin/homework/homework_0714_0718 (homework5_str)

; 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 ptr @mine_strchr(ptr noundef %0, i8 noundef signext %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i8, align 1
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i8 %1, ptr %5, align 1, !tbaa !9
  br label %6

6:                                                ; preds = %20, %2
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = load i8, ptr %7, align 1, !tbaa !9
  %9 = sext i8 %8 to i32
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %18

11:                                               ; preds = %6
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = load i8, ptr %12, align 1, !tbaa !9
  %14 = sext i8 %13 to i32
  %15 = load i8, ptr %5, align 1, !tbaa !9
  %16 = sext i8 %15 to i32
  %17 = icmp ne i32 %14, %16
  br label %18

18:                                               ; preds = %11, %6
  %19 = phi i1 [ false, %6 ], [ %17, %11 ]
  br i1 %19, label %20, label %23

20:                                               ; preds = %18
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %21, i32 1
  store ptr %22, ptr %4, align 8, !tbaa !5
  br label %6, !llvm.loop !10

23:                                               ; preds = %18
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load i8, ptr %24, align 1, !tbaa !9
  %26 = sext i8 %25 to i32
  %27 = load i8, ptr %5, align 1, !tbaa !9
  %28 = sext i8 %27 to i32
  %29 = icmp eq i32 %26, %28
  br i1 %29, label %30, label %32

30:                                               ; preds = %23
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %31, ptr %3, align 8
  br label %33

32:                                               ; preds = %23
  store ptr null, ptr %3, align 8
  br label %33

33:                                               ; preds = %32, %30
  %34 = load ptr, ptr %3, align 8
  ret ptr %34
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"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(read, inaccessiblemem: none) uwtable
define dso_local ptr @mine_strchr(ptr noundef readonly %0, i8 noundef signext %1) local_unnamed_addr #0 {
  br label %3

3:                                                ; preds = %3, %2
  %.07 = phi ptr [ %0, %2 ], [ %5, %3 ]
  %4 = load i8, ptr %.07, align 1, !tbaa !5
  %.not = icmp eq i8 %4, 0
  %.not9 = icmp eq i8 %4, %1
  %or.cond = or i1 %.not, %.not9
  %5 = getelementptr inbounds i8, ptr %.07, i64 1
  br i1 %or.cond, label %.critedge, label %3, !llvm.loop !8

.critedge:                                        ; preds = %3
  %.07. = select i1 %.not9, ptr %.07, ptr null
  ret ptr %.07.
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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,GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass