; LLVM IR from MakeContributions/DSA :: algorithms/C/strings (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"

@.str = external hidden unnamed_addr constant [21 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [17 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local void @isPalindrome(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  store i32 0, ptr %3, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = call i64 @strlen(ptr noundef %6) #5
  %8 = sub i64 %7, 1
  %9 = trunc i64 %8 to i32
  store i32 %9, ptr %4, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %33, %1
  %11 = load i32, ptr %4, align 4, !tbaa !9
  %12 = load i32, ptr %3, align 4, !tbaa !9
  %13 = icmp sgt i32 %11, %12
  br i1 %13, label %14, label %34

14:                                               ; preds = %10
  %15 = load ptr, ptr %2, align 8, !tbaa !5
  %16 = load i32, ptr %3, align 4, !tbaa !9
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %3, align 4, !tbaa !9
  %18 = sext i32 %16 to i64
  %19 = getelementptr inbounds i8, ptr %15, i64 %18
  %20 = load i8, ptr %19, align 1, !tbaa !11
  %21 = sext i8 %20 to i32
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !9
  %24 = add nsw i32 %23, -1
  store i32 %24, ptr %4, align 4, !tbaa !9
  %25 = sext i32 %23 to i64
  %26 = getelementptr inbounds i8, ptr %22, i64 %25
  %27 = load i8, ptr %26, align 1, !tbaa !11
  %28 = sext i8 %27 to i32
  %29 = icmp ne i32 %21, %28
  br i1 %29, label %30, label %33

30:                                               ; preds = %14
  %31 = load ptr, ptr %2, align 8, !tbaa !5
  %32 = call i32 (ptr, ...) @printf(ptr noundef @.str, ptr noundef %31)
  store i32 1, ptr %5, align 4
  br label %37

33:                                               ; preds = %14
  br label %10, !llvm.loop !12

34:                                               ; preds = %10
  %35 = load ptr, ptr %2, align 8, !tbaa !5
  %36 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, ptr noundef %35)
  store i32 0, ptr %5, align 4
  br label %37

37:                                               ; preds = %34, %30
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  %38 = load i32, ptr %5, align 4
  switch i32 %38, label %40 [
    i32 0, label %39
    i32 1, label %39
  ]

39:                                               ; preds = %37, %37
  ret void

40:                                               ; preds = %37
  unreachable
}

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

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #2

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

; 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 = { 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 #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 }
attributes #5 = { 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 = !{!"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 = !{!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"

@.str = external hidden unnamed_addr constant [21 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [17 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local void @isPalindrome(ptr noundef %0) local_unnamed_addr #0 {
  %2 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %0) #3
  %3 = trunc i64 %2 to i32
  br label %4

4:                                                ; preds = %7, %1
  %indvars.iv = phi i64 [ %indvars.iv.next, %7 ], [ 0, %1 ]
  %.0.in = phi i32 [ %.0, %7 ], [ %3, %1 ]
  %.0 = add i32 %.0.in, -1
  %5 = sext i32 %.0 to i64
  %6 = icmp slt i64 %indvars.iv, %5
  br i1 %6, label %7, label %14

7:                                                ; preds = %4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %8 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %0, i64 %5
  %11 = load i8, ptr %10, align 1, !tbaa !5
  %.not = icmp eq i8 %9, %11
  br i1 %.not, label %4, label %12, !llvm.loop !8

12:                                               ; preds = %7
  %13 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, ptr noundef nonnull %0)
  br label %16

14:                                               ; preds = %4
  %15 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, ptr noundef %0)
  br label %16

16:                                               ; preds = %14, %12
  ret void
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #1

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

attributes #0 = { nofree 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 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 #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 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass