; LLVM IR from kaynewbie/algorithm :: algorithm/LeetCode/Easy (longest-palindromic-substring)

; 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: 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: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @formatString(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = mul nsw i32 %8, 2
  %10 = add nsw i32 %9, 3
  store i32 %10, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = sext i32 %11 to i64
  %13 = mul i64 1, %12
  %14 = call noalias ptr @malloc(i64 noundef %13) #4
  store ptr %14, ptr %6, align 8, !tbaa !5
  %15 = load ptr, ptr %6, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %15, i64 0
  store i8 36, ptr %16, align 1, !tbaa !11
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = sub nsw i32 %18, 1
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i8, ptr %17, i64 %20
  store i8 94, ptr %21, align 1, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %22

22:                                               ; preds = %45, %2
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = load i32, ptr %4, align 4, !tbaa !9
  %25 = icmp slt i32 %23, %24
  br i1 %25, label %27, label %26

26:                                               ; preds = %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %48

27:                                               ; preds = %22
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = load i32, ptr %7, align 4, !tbaa !9
  %30 = mul nsw i32 %29, 2
  %31 = add nsw i32 %30, 1
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i8, ptr %28, i64 %32
  store i8 35, ptr %33, align 1, !tbaa !11
  %34 = load ptr, ptr %3, align 8, !tbaa !5
  %35 = load i32, ptr %7, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i8, ptr %34, i64 %36
  %38 = load i8, ptr %37, align 1, !tbaa !11
  %39 = load ptr, ptr %6, align 8, !tbaa !5
  %40 = load i32, ptr %7, align 4, !tbaa !9
  %41 = mul nsw i32 %40, 2
  %42 = add nsw i32 %41, 2
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds i8, ptr %39, i64 %43
  store i8 %38, ptr %44, align 1, !tbaa !11
  br label %45

45:                                               ; preds = %27
  %46 = load i32, ptr %7, align 4, !tbaa !9
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %7, align 4, !tbaa !9
  br label %22, !llvm.loop !12

48:                                               ; preds = %26
  %49 = load ptr, ptr %6, align 8, !tbaa !5
  %50 = load i32, ptr %5, align 4, !tbaa !9
  %51 = sub nsw i32 %50, 2
  %52 = sext i32 %51 to i64
  %53 = getelementptr inbounds i8, ptr %49, i64 %52
  store i8 35, ptr %53, align 1, !tbaa !11
  %54 = load ptr, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret ptr %54
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind allocsize(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 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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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"

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind memory(write, argmem: read, inaccessiblemem: readwrite) uwtable
define dso_local noalias noundef ptr @formatString(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = shl nsw i32 %1, 1
  %4 = add nsw i32 %3, 3
  %5 = sext i32 %4 to i64
  %6 = tail call noalias ptr @malloc(i64 noundef %5) #2
  store i8 36, ptr %6, align 1, !tbaa !5
  %7 = sext i32 %3 to i64
  %8 = getelementptr i8, ptr %6, i64 %7
  %9 = getelementptr i8, ptr %8, i64 2
  store i8 94, ptr %9, align 1, !tbaa !5
  %invariant.gep = getelementptr inbounds i8, ptr %6, i64 2
  %10 = icmp sgt i32 %1, 0
  br i1 %10, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  %min.iters.check = icmp ult i32 %1, 16
  br i1 %min.iters.check, label %.lr.ph.preheader20, label %vector.ph

.lr.ph.preheader20:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483632
  %invariant.gep21 = getelementptr i8, ptr %invariant.gep, i64 -1
  %invariant.gep23 = getelementptr i8, ptr %invariant.gep, i64 -1
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %11 = shl nuw nsw i64 %index, 1
  %12 = shl i64 %index, 1
  %13 = or disjoint i64 %12, 16
  %14 = getelementptr inbounds i8, ptr %0, i64 %index
  %15 = getelementptr inbounds i8, ptr %14, i64 8
  %wide.load = load <8 x i8>, ptr %14, align 1, !tbaa !5
  %wide.load18 = load <8 x i8>, ptr %15, align 1, !tbaa !5
  %gep22 = getelementptr i8, ptr %invariant.gep21, i64 %11
  %gep24 = getelementptr i8, ptr %invariant.gep23, i64 %13
  %interleaved.vec = shufflevector <8 x i8> <i8 35, i8 35, i8 35, i8 35, i8 35, i8 35, i8 35, i8 35>, <8 x i8> %wide.load, <16 x i32> <i32 0, i32 8, i32 1, i32 9, i32 2, i32 10, i32 3, i32 11, i32 4, i32 12, i32 5, i32 13, i32 6, i32 14, i32 7, i32 15>
  store <16 x i8> %interleaved.vec, ptr %gep22, align 1, !tbaa !5
  %interleaved.vec19 = shufflevector <8 x i8> <i8 35, i8 35, i8 35, i8 35, i8 35, i8 35, i8 35, i8 35>, <8 x i8> %wide.load18, <16 x i32> <i32 0, i32 8, i32 1, i32 9, i32 2, i32 10, i32 3, i32 11, i32 4, i32 12, i32 5, i32 13, i32 6, i32 14, i32 7, i32 15>
  store <16 x i8> %interleaved.vec19, ptr %gep24, align 1, !tbaa !5
  %index.next = add nuw i64 %index, 16
  %16 = icmp eq i64 %index.next, %n.vec
  br i1 %16, label %middle.block, label %vector.body, !llvm.loop !8

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader20

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %2
  %17 = or disjoint i32 %3, 1
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds i8, ptr %6, i64 %18
  store i8 35, ptr %19, align 1, !tbaa !5
  ret ptr %6

.lr.ph:                                           ; preds = %.lr.ph.preheader20, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader20 ]
  %20 = shl nuw nsw i64 %indvars.iv, 1
  %21 = or disjoint i64 %20, 1
  %22 = getelementptr inbounds i8, ptr %6, i64 %21
  store i8 35, ptr %22, align 1, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %24 = load i8, ptr %23, align 1, !tbaa !5
  %gep = getelementptr inbounds i8, ptr %invariant.gep, i64 %20
  store i8 %24, ptr %gep, align 1, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12
}

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nofree nounwind memory(write, argmem: read, inaccessiblemem: readwrite) 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 allocsize(0) }

!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, !10, !11}
!9 = !{!"llvm.loop.mustprogress"}
!10 = !{!"llvm.loop.isvectorized", i32 1}
!11 = !{!"llvm.loop.unroll.runtime.disable"}
!12 = distinct !{!12, !9, !11, !10}


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