; LLVM IR from AllenDowney/ExercisesInC :: exercises/web_server (str_echo08)

; 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"

@.str = external hidden unnamed_addr constant [7 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [13 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local void @str_echo(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca [4096 x i8], align 16
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  call void @llvm.lifetime.start.p0(i64 4096, ptr %6) #5
  br label %7

7:                                                ; preds = %26, %1
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = getelementptr inbounds [4096 x i8], ptr %6, i64 0, i64 0
  %10 = call i64 @Readline(i32 noundef %8, ptr noundef %9, i64 noundef 4096)
  store i64 %10, ptr %5, align 8, !tbaa !9
  %11 = icmp eq i64 %10, 0
  br i1 %11, label %12, label %13

12:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4096, ptr %6) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #5
  ret void

13:                                               ; preds = %7
  %14 = getelementptr inbounds [4096 x i8], ptr %6, i64 0, i64 0
  %15 = call i32 (ptr, ptr, ...) @__isoc99_sscanf(ptr noundef %14, ptr noundef @.str, ptr noundef %3, ptr noundef %4) #5
  %16 = icmp eq i32 %15, 2
  br i1 %16, label %17, label %23

17:                                               ; preds = %13
  %18 = getelementptr inbounds [4096 x i8], ptr %6, i64 0, i64 0
  %19 = load i64, ptr %3, align 8, !tbaa !9
  %20 = load i64, ptr %4, align 8, !tbaa !9
  %21 = add nsw i64 %19, %20
  %22 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef %18, i64 noundef 4096, ptr noundef @.str.1, i64 noundef %21) #5
  br label %26

23:                                               ; preds = %13
  %24 = getelementptr inbounds [4096 x i8], ptr %6, i64 0, i64 0
  %25 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef %24, i64 noundef 4096, ptr noundef @.str.2) #5
  br label %26

26:                                               ; preds = %23, %17
  %27 = getelementptr inbounds [4096 x i8], ptr %6, i64 0, i64 0
  %28 = call i64 @strlen(ptr noundef %27) #6
  store i64 %28, ptr %5, align 8, !tbaa !9
  %29 = load i32, ptr %2, align 4, !tbaa !5
  %30 = getelementptr inbounds [4096 x i8], ptr %6, i64 0, i64 0
  %31 = load i64, ptr %5, align 8, !tbaa !9
  call void @Writen(i32 noundef %29, ptr noundef %30, i64 noundef %31)
  br label %7
}

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

declare i64 @Readline(i32 noundef, ptr noundef, i64 noundef) #2

; Function Attrs: nounwind
declare i32 @__isoc99_sscanf(ptr noundef, ptr noundef, ...) #3

; Function Attrs: nounwind
declare i32 @snprintf(ptr noundef, i64 noundef, ptr noundef, ...) #3

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #4

declare void @Writen(i32 noundef, ptr noundef, i64 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 "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 #4 = { nounwind willreturn memory(read) "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 #5 = { nounwind }
attributes #6 = { nounwind willreturn memory(read) }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}


; 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"

@.str = external hidden unnamed_addr constant [7 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [13 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local void @str_echo(i32 noundef %0) local_unnamed_addr #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca [4096 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #5
  call void @llvm.lifetime.start.p0(i64 4096, ptr nonnull %4) #5
  %5 = call i64 @Readline(i32 noundef %0, ptr noundef nonnull %4, i64 noundef 4096) #5
  %6 = icmp eq i64 %5, 0
  br i1 %6, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %16, %1
  call void @llvm.lifetime.end.p0(i64 4096, ptr nonnull %4) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #5
  ret void

.lr.ph:                                           ; preds = %1, %16
  %7 = call i32 (ptr, ptr, ...) @__isoc99_sscanf(ptr noundef nonnull %4, ptr noundef nonnull @.str, ptr noundef nonnull %2, ptr noundef nonnull %3) #5
  %8 = icmp eq i32 %7, 2
  br i1 %8, label %9, label %14

9:                                                ; preds = %.lr.ph
  %10 = load i64, ptr %2, align 8, !tbaa !5
  %11 = load i64, ptr %3, align 8, !tbaa !5
  %12 = add nsw i64 %11, %10
  %13 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef nonnull dereferenceable(1) %4, i64 noundef 4096, ptr noundef nonnull @.str.1, i64 noundef %12) #5
  br label %16

14:                                               ; preds = %.lr.ph
  %15 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef nonnull dereferenceable(1) %4, i64 noundef 4096, ptr noundef nonnull @.str.2) #5
  br label %16

16:                                               ; preds = %14, %9
  %17 = call i64 @strlen(ptr noundef nonnull dereferenceable(1) %4) #6
  call void @Writen(i32 noundef %0, ptr noundef nonnull %4, i64 noundef %17) #5
  %18 = call i64 @Readline(i32 noundef %0, ptr noundef nonnull %4, i64 noundef 4096) #5
  %19 = icmp eq i64 %18, 0
  br i1 %19, label %._crit_edge, label %.lr.ph
}

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

declare i64 @Readline(i32 noundef, ptr noundef, i64 noundef) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_sscanf(ptr nocapture noundef readonly, ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: nofree nounwind
declare noundef i32 @snprintf(ptr noalias nocapture noundef writeonly, i64 noundef, ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #4

declare void @Writen(i32 noundef, ptr noundef, i64 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 = { nofree nounwind "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 #4 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 #5 = { nounwind }
attributes #6 = { nounwind willreturn memory(read) }

!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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


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