; LLVM IR from xuxping/codelife :: leetcode (9)

; 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 i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = icmp slt i32 %5, 0
  br i1 %6, label %14, label %7

7:                                                ; preds = %1
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp ne i32 %8, 0
  br i1 %9, label %10, label %15

10:                                               ; preds = %7
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = srem i32 %11, 10
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %15

14:                                               ; preds = %10, %1
  store i32 0, ptr %2, align 4
  br label %40

15:                                               ; preds = %10, %7
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %20, %15
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = icmp sgt i32 %17, %18
  br i1 %19, label %20, label %28

20:                                               ; preds = %16
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = mul nsw i32 %21, 10
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = srem i32 %23, 10
  %25 = add nsw i32 %22, %24
  store i32 %25, ptr %4, align 4, !tbaa !5
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = sdiv i32 %26, 10
  store i32 %27, ptr %3, align 4, !tbaa !5
  br label %16, !llvm.loop !9

28:                                               ; preds = %16
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = icmp eq i32 %29, %30
  br i1 %31, label %37, label %32

32:                                               ; preds = %28
  %33 = load i32, ptr %3, align 4, !tbaa !5
  %34 = load i32, ptr %4, align 4, !tbaa !5
  %35 = sdiv i32 %34, 10
  %36 = icmp eq i32 %33, %35
  br label %37

37:                                               ; preds = %32, %28
  %38 = phi i1 [ true, %28 ], [ %36, %32 ]
  %39 = zext i1 %38 to i32
  store i32 %39, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %40

40:                                               ; preds = %37, %14
  %41 = load i32, ptr %2, align 4
  ret i32 %41
}

; 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 range(i32 0, 2) i32 @isPalindrome(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 0
  br i1 %2, label %._crit_edge.thread, label %3

3:                                                ; preds = %1
  %.not = icmp ne i32 %0, 0
  %4 = urem i32 %0, 10
  %5 = icmp eq i32 %4, 0
  %or.cond = and i1 %.not, %5
  br i1 %or.cond, label %._crit_edge.thread, label %.preheader

.preheader:                                       ; preds = %3
  %.not20 = icmp eq i32 %0, 0
  br i1 %.not20, label %._crit_edge.thread, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.018 = phi i32 [ %8, %.lr.ph ], [ 0, %.preheader ]
  %.01317 = phi i32 [ %9, %.lr.ph ], [ %0, %.preheader ]
  %6 = mul nsw i32 %.018, 10
  %7 = urem i32 %.01317, 10
  %8 = add nsw i32 %6, %7
  %9 = udiv i32 %.01317, 10
  %10 = icmp sgt i32 %9, %8
  br i1 %10, label %.lr.ph, label %._crit_edge, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph
  %11 = icmp eq i32 %9, %8
  br i1 %11, label %._crit_edge.thread, label %12

12:                                               ; preds = %._crit_edge
  %13 = udiv i32 %8, 10
  %14 = icmp eq i32 %9, %13
  %15 = zext i1 %14 to i32
  br label %._crit_edge.thread

._crit_edge.thread:                               ; preds = %.preheader, %._crit_edge, %12, %1, %3
  %.014 = phi i32 [ 0, %3 ], [ 0, %1 ], [ 1, %._crit_edge ], [ %15, %12 ], [ 1, %.preheader ]
  ret i32 %.014
}

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