; LLVM IR from chensoft/libsocket :: lib/libchen/src/base/str.ll (ZN4chen3str5equalEPKcmS2_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 @_ZN4chen3str5equalEPKcmS2_m(ptr noundef %0, i64 noundef %1, ptr noundef %2, i64 noundef %3) #1 align 2 {
  %5 = alloca i1, align 1
  %6 = alloca ptr, align 8
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i64, align 8
  %10 = alloca i64, align 8
  %11 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store i64 %1, ptr %7, align 8, !tbaa !9
  store ptr %2, ptr %8, align 8, !tbaa !5
  store i64 %3, ptr %9, align 8, !tbaa !9
  %12 = load i64, ptr %7, align 8, !tbaa !9
  %13 = load i64, ptr %9, align 8, !tbaa !9
  %14 = icmp ne i64 %12, %13
  br i1 %14, label %15, label %16

15:                                               ; preds = %4
  store i1 false, ptr %5, align 1
  br label %42

16:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #2
  store i64 0, ptr %10, align 8, !tbaa !9
  br label %17

17:                                               ; preds = %36, %16
  %18 = load i64, ptr %10, align 8, !tbaa !9
  %19 = load i64, ptr %7, align 8, !tbaa !9
  %20 = icmp ult i64 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  store i32 2, ptr %11, align 4
  br label %39

22:                                               ; preds = %17
  %23 = load ptr, ptr %6, align 8, !tbaa !5
  %24 = load i64, ptr %10, align 8, !tbaa !9
  %25 = getelementptr inbounds i8, ptr %23, i64 %24
  %26 = load i8, ptr %25, align 1, !tbaa !11
  %27 = sext i8 %26 to i32
  %28 = load ptr, ptr %8, align 8, !tbaa !5
  %29 = load i64, ptr %10, align 8, !tbaa !9
  %30 = getelementptr inbounds i8, ptr %28, i64 %29
  %31 = load i8, ptr %30, align 1, !tbaa !11
  %32 = sext i8 %31 to i32
  %33 = icmp ne i32 %27, %32
  br i1 %33, label %34, label %35

34:                                               ; preds = %22
  store i1 false, ptr %5, align 1
  store i32 1, ptr %11, align 4
  br label %39

35:                                               ; preds = %22
  br label %36

36:                                               ; preds = %35
  %37 = load i64, ptr %10, align 8, !tbaa !9
  %38 = add i64 %37, 1
  store i64 %38, ptr %10, align 8, !tbaa !9
  br label %17, !llvm.loop !12

39:                                               ; preds = %34, %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #2
  %40 = load i32, ptr %11, align 4
  switch i32 %40, label %44 [
    i32 2, label %41
    i32 1, label %42
  ]

41:                                               ; preds = %39
  store i1 true, ptr %5, align 1
  br label %42

42:                                               ; preds = %41, %39, %15
  %43 = load i1, ptr %5, align 1
  ret i1 %43

44:                                               ; preds = %39
  unreachable
}

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 }

!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 norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef zeroext i1 @_ZN4chen3str5equalEPKcmS2_m(ptr nocapture noundef readonly %0, i64 noundef %1, ptr nocapture noundef readonly %2, i64 noundef %3) local_unnamed_addr #0 align 2 {
  %.not = icmp eq i64 %1, %3
  br i1 %.not, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %4
  %5 = icmp eq i64 %1, 0
  br i1 %5, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.preheader
  %.01014 = phi i64 [ 0, %.preheader ], [ %10, %.lr.ph ]
  %6 = getelementptr inbounds i8, ptr %0, i64 %.01014
  %7 = load i8, ptr %6, align 1, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %2, i64 %.01014
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %.not13 = icmp eq i8 %7, %9
  %.not13.not = xor i1 %.not13, true
  %10 = add nuw i64 %.01014, 1
  %exitcond = icmp eq i64 %10, %1
  %or.cond = select i1 %.not13.not, i1 true, i1 %exitcond
  br i1 %or.cond, label %.loopexit, label %.lr.ph, !llvm.loop !8

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %4
  %.1 = phi i1 [ false, %4 ], [ true, %.preheader ], [ %.not13, %.lr.ph ]
  ret i1 %.1
}

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 = !{!"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