; LLVM IR from wuzhouhui/leetcode :: 9_palind_num (isPalindrome)

; 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 i32 @isPalindrome(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp slt i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %36

10:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %11 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %11, ptr %5, align 4, !tbaa !5
  store i64 0, ptr %4, align 8, !tbaa !9
  br label %12

12:                                               ; preds = %22, %10
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = icmp sgt i32 %13, 0
  br i1 %14, label %15, label %25

15:                                               ; preds = %12
  %16 = load i64, ptr %4, align 8, !tbaa !9
  %17 = mul nsw i64 %16, 10
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = srem i32 %18, 10
  %20 = sext i32 %19 to i64
  %21 = add nsw i64 %17, %20
  store i64 %21, ptr %4, align 8, !tbaa !9
  br label %22

22:                                               ; preds = %15
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = sdiv i32 %23, 10
  store i32 %24, ptr %5, align 4, !tbaa !5
  br label %12, !llvm.loop !11

25:                                               ; preds = %12
  %26 = load i64, ptr %4, align 8, !tbaa !9
  %27 = icmp sgt i64 %26, 2147483647
  br i1 %27, label %33, label %28

28:                                               ; preds = %25
  %29 = load i64, ptr %4, align 8, !tbaa !9
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = icmp ne i64 %29, %31
  br i1 %32, label %33, label %34

33:                                               ; preds = %28, %25
  store i32 0, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %35

34:                                               ; preds = %28
  store i32 1, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %35

35:                                               ; preds = %34, %33
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %36

36:                                               ; preds = %35, %9
  %37 = load i32, ptr %2, align 4
  ret i32 %37
}

; 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

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 }

!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 long", !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: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local range(i32 0, 2) i32 @isPalindrome(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 0
  br i1 %2, label %10, label %.preheader

.preheader:                                       ; preds = %1
  %.not1314 = icmp eq i32 %0, 0
  br i1 %.not1314, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.016 = phi i32 [ %7, %.lr.ph ], [ %0, %.preheader ]
  %.01015 = phi i64 [ %6, %.lr.ph ], [ 0, %.preheader ]
  %3 = mul nsw i64 %.01015, 10
  %4 = urem i32 %.016, 10
  %5 = zext nneg i32 %4 to i64
  %6 = add nsw i64 %3, %5
  %7 = udiv i32 %.016, 10
  %.not13 = icmp ult i32 %.016, 10
  br i1 %.not13, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.010.lcssa = phi i64 [ 0, %.preheader ], [ %6, %.lr.ph ]
  %8 = icmp slt i64 %.010.lcssa, 2147483648
  %9 = zext nneg i32 %0 to i64
  %.not = icmp eq i64 %.010.lcssa, %9
  %or.cond = select i1 %8, i1 %.not, i1 false
  %.011 = zext i1 %or.cond to i32
  br label %10

10:                                               ; preds = %1, %._crit_edge
  %.1 = phi i32 [ %.011, %._crit_edge ], [ 0, %1 ]
  ret i32 %.1
}

attributes #0 = { nofree norecurse nosync nounwind memory(none) 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" }

!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: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass