; LLVM IR from Montimage/mmt-security :: src/lib/expression.ll (num_digits)

; 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 i64 @_num_digits(i32 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = icmp slt i32 %4, 0
  br i1 %5, label %6, label %16

6:                                                ; preds = %1
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp eq i32 %7, -2147483648
  br i1 %8, label %9, label %10

9:                                                ; preds = %6
  br label %13

10:                                               ; preds = %6
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = sub nsw i32 0, %11
  br label %13

13:                                               ; preds = %10, %9
  %14 = phi i32 [ 2147483647, %9 ], [ %12, %10 ]
  %15 = call i64 @_num_digits(i32 noundef %14)
  store i64 %15, ptr %2, align 8
  br label %25

16:                                               ; preds = %1
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = icmp slt i32 %17, 10
  br i1 %18, label %19, label %20

19:                                               ; preds = %16
  store i64 1, ptr %2, align 8
  br label %25

20:                                               ; preds = %16
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = sdiv i32 %21, 10
  %23 = call i64 @_num_digits(i32 noundef %22)
  %24 = add i64 1, %23
  store i64 %24, ptr %2, align 8
  br label %25

25:                                               ; preds = %20, %19, %13
  %26 = load i64, ptr %2, align 8
  ret i64 %26
}

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" }

!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"}


; 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 i64 @_num_digits(i32 noundef %0) local_unnamed_addr #0 {
  br label %tailrecurse.outer

tailrecurse.outer:                                ; preds = %tailrecurse._crit_edge.thread, %1
  %accumulator.tr.ph = phi i64 [ %7, %tailrecurse._crit_edge.thread ], [ 0, %1 ]
  %.tr.ph = phi i32 [ %6, %tailrecurse._crit_edge.thread ], [ %0, %1 ]
  %2 = icmp slt i32 %.tr.ph, 0
  br i1 %2, label %tailrecurse.preheader, label %tailrecurse._crit_edge

tailrecurse.preheader:                            ; preds = %tailrecurse.outer
  %3 = icmp eq i32 %.tr.ph, -2147483648
  %4 = sub nsw i32 0, %.tr.ph
  br i1 %3, label %tailrecurse._crit_edge.thread, label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %tailrecurse.preheader, %tailrecurse.outer
  %.tr.lcssa = phi i32 [ %.tr.ph, %tailrecurse.outer ], [ %4, %tailrecurse.preheader ]
  %5 = icmp ult i32 %.tr.lcssa, 10
  br i1 %5, label %8, label %tailrecurse._crit_edge.thread

tailrecurse._crit_edge.thread:                    ; preds = %tailrecurse.preheader, %tailrecurse._crit_edge
  %.tr.lcssa9 = phi i32 [ %.tr.lcssa, %tailrecurse._crit_edge ], [ 2147483647, %tailrecurse.preheader ]
  %6 = udiv i32 %.tr.lcssa9, 10
  %7 = add i64 %accumulator.tr.ph, 1
  br label %tailrecurse.outer

8:                                                ; preds = %tailrecurse._crit_edge
  %accumulator.ret.tr = add i64 %accumulator.tr.ph, 1
  ret i64 %accumulator.ret.tr
}

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)"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IPSCCPPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass