; LLVM IR from yourtion/LearningMasteringAlgorithms-C :: source (cbc)

; 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 void @cbc_encipher(ptr noundef %0, ptr noundef %1, ptr noundef %2, i32 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca [8 x i8], align 1
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !5
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = getelementptr inbounds i8, ptr %11, i64 0
  %13 = load ptr, ptr %6, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %13, i64 0
  %15 = load ptr, ptr %7, align 8, !tbaa !5
  call void @des_encipher(ptr noundef %12, ptr noundef %14, ptr noundef %15)
  store i32 8, ptr %10, align 4, !tbaa !9
  br label %16

16:                                               ; preds = %20, %4
  %17 = load i32, ptr %10, align 4, !tbaa !9
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = icmp slt i32 %17, %18
  br i1 %19, label %20, label %38

20:                                               ; preds = %16
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = load i32, ptr %10, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i8, ptr %21, i64 %23
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = load i32, ptr %10, align 4, !tbaa !9
  %27 = sub nsw i32 %26, 8
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds i8, ptr %25, i64 %28
  %30 = getelementptr inbounds [8 x i8], ptr %9, i64 0, i64 0
  call void @bit_xor(ptr noundef %24, ptr noundef %29, ptr noundef %30, i32 noundef 64)
  %31 = getelementptr inbounds [8 x i8], ptr %9, i64 0, i64 0
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  %33 = load i32, ptr %10, align 4, !tbaa !9
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds i8, ptr %32, i64 %34
  call void @des_encipher(ptr noundef %31, ptr noundef %35, ptr noundef null)
  %36 = load i32, ptr %10, align 4, !tbaa !9
  %37 = add nsw i32 %36, 8
  store i32 %37, ptr %10, align 4, !tbaa !9
  br label %16, !llvm.loop !11

38:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare void @des_encipher(ptr noundef, ptr noundef, ptr noundef) #2

declare void @bit_xor(ptr noundef, ptr noundef, ptr noundef, i32 noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { "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 }

!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 = distinct !{!11, !12}
!12 = !{!"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
define dso_local void @cbc_encipher(ptr noundef %0, ptr noundef %1, ptr noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = alloca [8 x i8], align 1
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #3
  tail call void @des_encipher(ptr noundef %0, ptr noundef %1, ptr noundef %2) #3
  %6 = icmp sgt i32 %3, 8
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %4, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 8, %4 ]
  %7 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %8 = getelementptr i8, ptr %1, i64 %indvars.iv
  %9 = getelementptr i8, ptr %8, i64 -8
  call void @bit_xor(ptr noundef nonnull %7, ptr noundef %9, ptr noundef nonnull %5, i32 noundef 64) #3
  call void @des_encipher(ptr noundef nonnull %5, ptr noundef nonnull %8, ptr noundef null) #3
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 8
  %10 = trunc nuw i64 %indvars.iv.next to i32
  %11 = icmp slt i32 %10, %3
  br i1 %11, label %.lr.ph, label %._crit_edge, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #3
  ret void
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare void @des_encipher(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #2

declare void @bit_xor(ptr noundef, ptr noundef, ptr noundef, i32 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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