; LLVM IR from davidesantangelo/krep :: krep (memory_equals_case_insensitive)

; 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"

@lower_table = external dso_local global [256 x i8], align 16

; 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: inlinehint nounwind uwtable
define dso_local zeroext i1 @memory_equals_case_insensitive(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
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i64 0, ptr %8, align 8, !tbaa !9
  br label %10

10:                                               ; preds = %35, %3
  %11 = load i64, ptr %8, align 8, !tbaa !9
  %12 = load i64, ptr %7, align 8, !tbaa !9
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  store i32 2, ptr %9, align 4
  br label %38

15:                                               ; preds = %10
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = load i64, ptr %8, align 8, !tbaa !9
  %18 = getelementptr inbounds i8, ptr %16, i64 %17
  %19 = load i8, ptr %18, align 1, !tbaa !11
  %20 = zext i8 %19 to i64
  %21 = getelementptr inbounds [256 x i8], ptr @lower_table, i64 0, i64 %20
  %22 = load i8, ptr %21, align 1, !tbaa !11
  %23 = zext i8 %22 to i32
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = load i64, ptr %8, align 8, !tbaa !9
  %26 = getelementptr inbounds i8, ptr %24, i64 %25
  %27 = load i8, ptr %26, align 1, !tbaa !11
  %28 = zext i8 %27 to i64
  %29 = getelementptr inbounds [256 x i8], ptr @lower_table, i64 0, i64 %28
  %30 = load i8, ptr %29, align 1, !tbaa !11
  %31 = zext i8 %30 to i32
  %32 = icmp ne i32 %23, %31
  br i1 %32, label %33, label %34

33:                                               ; preds = %15
  store i1 false, ptr %4, align 1
  store i32 1, ptr %9, align 4
  br label %38

34:                                               ; preds = %15
  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 %10, !llvm.loop !12

38:                                               ; preds = %33, %14
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  %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
  %42 = load i1, ptr %4, align 1
  ret i1 %42

43:                                               ; preds = %38
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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/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"

@lower_table = external dso_local local_unnamed_addr global [256 x i8], align 16

; Function Attrs: inlinehint nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local zeroext i1 @memory_equals_case_insensitive(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i64 %2, 0
  br i1 %4, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %5 = load i8, ptr %0, align 1, !tbaa !5
  %6 = zext i8 %5 to i64
  %7 = getelementptr inbounds [256 x i8], ptr @lower_table, i64 0, i64 %6
  %8 = load i8, ptr %7, align 1, !tbaa !5
  %9 = load i8, ptr %1, align 1, !tbaa !5
  %10 = zext i8 %9 to i64
  %11 = getelementptr inbounds [256 x i8], ptr @lower_table, i64 0, i64 %10
  %12 = load i8, ptr %11, align 1, !tbaa !5
  %.not13 = icmp eq i8 %8, %12
  br i1 %.not13, label %.lr.ph15, label %._crit_edge

.lr.ph15:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %.081014 = phi i64 [ %13, %.lr.ph ], [ 0, %.lr.ph.preheader ]
  %13 = add nuw i64 %.081014, 1
  %exitcond = icmp eq i64 %13, %2
  br i1 %exitcond, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !8

.lr.ph:                                           ; preds = %.lr.ph15
  %14 = getelementptr inbounds i8, ptr %0, i64 %13
  %15 = load i8, ptr %14, align 1, !tbaa !5
  %16 = zext i8 %15 to i64
  %17 = getelementptr inbounds [256 x i8], ptr @lower_table, i64 0, i64 %16
  %18 = load i8, ptr %17, align 1, !tbaa !5
  %19 = getelementptr inbounds i8, ptr %1, i64 %13
  %20 = load i8, ptr %19, align 1, !tbaa !5
  %21 = zext i8 %20 to i64
  %22 = getelementptr inbounds [256 x i8], ptr @lower_table, i64 0, i64 %21
  %23 = load i8, ptr %22, align 1, !tbaa !5
  %.not = icmp eq i8 %18, %23
  br i1 %.not, label %.lr.ph15, label %._crit_edge.loopexit, !llvm.loop !8

._crit_edge.loopexit:                             ; preds = %.lr.ph15, %.lr.ph
  %24 = icmp uge i64 %13, %2
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.lr.ph.preheader, %3
  %.lcssa = phi i1 [ true, %3 ], [ false, %.lr.ph.preheader ], [ %24, %._crit_edge.loopexit ]
  ret i1 %.lcssa
}

attributes #0 = { inlinehint 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: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass