; LLVM IR from AllenDowney/ExercisesInC :: examples (palindrome)

; 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"

@__const.main.string = external hidden unnamed_addr constant [4 x i8], align 1
@.str = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome1(ptr noundef) #0

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

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

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome2(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome3(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome4(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome5(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome6(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local void @palindrome8(ptr noundef, ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca [4 x i8], align 1
  %3 = alloca ptr, align 8
  %4 = alloca [128 x i8], align 16
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %2, ptr align 1 @__const.main.string, i64 4, i1 false)
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  %5 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %6 = call ptr @palindrome1(ptr noundef %5)
  store ptr %6, ptr %3, align 8, !tbaa !5
  %7 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %8 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %7)
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %9)
  %11 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %12 = call ptr @palindrome2(ptr noundef %11)
  store ptr %12, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %14 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %13)
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %15)
  %17 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %18 = call ptr @palindrome3(ptr noundef %17)
  store ptr %18, ptr %3, align 8, !tbaa !5
  %19 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %20 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %19)
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %21)
  %23 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %24 = call ptr @palindrome4(ptr noundef %23)
  store ptr %24, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %26 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %25)
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %27)
  %29 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %30 = call ptr @palindrome5(ptr noundef %29)
  store ptr %30, ptr %3, align 8, !tbaa !5
  %31 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %32 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %31)
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %33)
  %35 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %36 = call ptr @palindrome6(ptr noundef %35)
  store ptr %36, ptr %3, align 8, !tbaa !5
  %37 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %38 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %37)
  %39 = load ptr, ptr %3, align 8, !tbaa !5
  %40 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %39)
  call void @llvm.lifetime.start.p0(i64 128, ptr %4) #4
  %41 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %42 = getelementptr inbounds [128 x i8], ptr %4, i64 0, i64 0
  call void @palindrome8(ptr noundef %41, ptr noundef %42)
  %43 = getelementptr inbounds [4 x i8], ptr %2, i64 0, i64 0
  %44 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %43)
  %45 = getelementptr inbounds [128 x i8], ptr %4, i64 0, i64 0
  %46 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %45)
  call void @llvm.lifetime.end.p0(i64 128, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  ret i32 0
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

declare i32 @printf(ptr noundef, ...) #3

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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { "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 }

!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"}


; 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"

@__const.main.string = external hidden unnamed_addr constant [4 x i8], align 1
@.str = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome1(ptr noundef) local_unnamed_addr #0

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

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

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome2(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome3(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome4(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome5(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @palindrome6(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @palindrome8(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca [4 x i8], align 4
  %2 = alloca [128 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  %3 = load i32, ptr @__const.main.string, align 1
  store i32 %3, ptr %1, align 4
  %4 = call ptr @palindrome1(ptr noundef nonnull %1)
  %5 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef nonnull %1)
  %6 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef %4)
  %7 = call ptr @palindrome2(ptr noundef nonnull %1)
  %8 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef nonnull %1)
  %9 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef %7)
  %10 = call ptr @palindrome3(ptr noundef nonnull %1)
  %11 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef nonnull %1)
  %12 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef %10)
  %13 = call ptr @palindrome4(ptr noundef nonnull %1)
  %14 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef nonnull %1)
  %15 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef %13)
  %16 = call ptr @palindrome5(ptr noundef nonnull %1)
  %17 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef nonnull %1)
  %18 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef %16)
  %19 = call ptr @palindrome6(ptr noundef nonnull %1)
  %20 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef nonnull %1)
  %21 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef %19)
  call void @llvm.lifetime.start.p0(i64 128, ptr nonnull %2) #3
  call void @palindrome8(ptr noundef nonnull %1, ptr noundef nonnull %2)
  %22 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef nonnull %1)
  %23 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef nonnull %2)
  call void @llvm.lifetime.end.p0(i64 128, ptr nonnull %2) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

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 = { 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 #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)"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass