; LLVM IR from LeetCode-in-C/LeetCode-in-C :: src/main/c/g0001_0100/s0009_palindrome_number (Solution)

; 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 zeroext i1 @isPalindrome(i32 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %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 i1 false, ptr %2, align 1
  br label %32

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

12:                                               ; preds = %19, %10
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = icmp sgt i32 %13, 0
  br i1 %14, label %15, label %27

15:                                               ; preds = %12
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = icmp sgt i32 %16, 214748364
  br i1 %17, label %18, label %19

18:                                               ; preds = %15
  store i1 false, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %31

19:                                               ; preds = %15
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = mul nsw i32 %20, 10
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = srem i32 %22, 10
  %24 = add nsw i32 %21, %23
  store i32 %24, ptr %4, align 4, !tbaa !5
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = sdiv i32 %25, 10
  store i32 %26, ptr %5, align 4, !tbaa !5
  br label %12, !llvm.loop !9

27:                                               ; preds = %12
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = icmp eq i32 %28, %29
  store i1 %30, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %31

31:                                               ; preds = %27, %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %32

32:                                               ; preds = %31, %9
  %33 = load i1, ptr %2, align 1
  ret i1 %33
}

; 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 = distinct !{!9, !10}
!10 = !{!"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 zeroext i1 @isPalindrome(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 0
  br i1 %2, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1
  %.not13 = icmp eq i32 %0, 0
  br i1 %.not13, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %4
  %.015 = phi i32 [ %8, %4 ], [ %0, %.preheader ]
  %.0914 = phi i32 [ %7, %4 ], [ 0, %.preheader ]
  %3 = icmp sgt i32 %.0914, 214748364
  br i1 %3, label %.loopexit, label %4

4:                                                ; preds = %.lr.ph
  %5 = mul nsw i32 %.0914, 10
  %6 = urem i32 %.015, 10
  %7 = add nsw i32 %6, %5
  %8 = udiv i32 %.015, 10
  %.not = icmp ult i32 %.015, 10
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %4, %.preheader
  %.09.lcssa = phi i32 [ 0, %.preheader ], [ %7, %4 ]
  %9 = icmp eq i32 %.09.lcssa, %0
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %._crit_edge, %1
  %.1 = phi i1 [ false, %1 ], [ %9, %._crit_edge ], [ false, %.lr.ph ]
  ret i1 %.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