; LLVM IR from ippeb/ACM-ICPC :: algebra/bignum/bignum.ll (Z6digitsR6bignum)

; 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"

%struct.bignum = type { [12 x i64], i32 }

@POW10 = external dso_local global [20 x i64], align 16

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z6digitsR6bignum(ptr noundef nonnull align 8 dereferenceable(104) %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.bignum, ptr %5, i32 0, i32 1
  %7 = load i32, ptr %6, align 8, !tbaa !9
  %8 = sub nsw i32 %7, 1
  %9 = mul nsw i32 %8, 9
  store i32 %9, ptr %3, align 4, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !12
  br label %10

10:                                               ; preds = %26, %1
  %11 = load ptr, ptr %2, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.bignum, ptr %11, i32 0, i32 0
  %13 = load ptr, ptr %2, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.bignum, ptr %13, i32 0, i32 1
  %15 = load i32, ptr %14, align 8, !tbaa !9
  %16 = sub nsw i32 %15, 1
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [12 x i64], ptr %12, i64 0, i64 %17
  %19 = load i64, ptr %18, align 8, !tbaa !13
  %20 = load i32, ptr %4, align 4, !tbaa !12
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [20 x i64], ptr @POW10, i64 0, i64 %21
  %23 = load i64, ptr %22, align 8, !tbaa !13
  %24 = sdiv i64 %19, %23
  %25 = icmp sge i64 %24, 10
  br i1 %25, label %26, label %29

26:                                               ; preds = %10
  %27 = load i32, ptr %4, align 4, !tbaa !12
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %4, align 4, !tbaa !12
  br label %10, !llvm.loop !15

29:                                               ; preds = %10
  %30 = load i32, ptr %3, align 4, !tbaa !12
  %31 = load i32, ptr %4, align 4, !tbaa !12
  %32 = add nsw i32 %30, %31
  %33 = add nsw i32 %32, 1
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %33
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 96}
!10 = !{!"_ZTS6bignum", !7, i64 0, !11, i64 96}
!11 = !{!"int", !7, i64 0}
!12 = !{!11, !11, i64 0}
!13 = !{!14, !14, i64 0}
!14 = !{!"long long", !7, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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"

@POW10 = external dso_local local_unnamed_addr global [20 x i64], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef range(i32 -2147483647, -2147483648) i32 @_Z6digitsR6bignum(ptr nocapture noundef nonnull readonly align 8 dereferenceable(104) %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 96
  %3 = load i32, ptr %2, align 8, !tbaa !5
  %4 = add nsw i32 %3, -1
  %5 = sext i32 %4 to i64
  %6 = getelementptr inbounds [12 x i64], ptr %0, i64 0, i64 %5
  %7 = load i64, ptr %6, align 8, !tbaa !10
  br label %8

8:                                                ; preds = %8, %1
  %indvars.iv = phi i64 [ %indvars.iv.next, %8 ], [ 0, %1 ]
  %9 = getelementptr inbounds [20 x i64], ptr @POW10, i64 0, i64 %indvars.iv
  %10 = load i64, ptr %9, align 8, !tbaa !10
  %11 = sdiv i64 %7, %10
  %12 = icmp sgt i64 %11, 9
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  br i1 %12, label %8, label %13, !llvm.loop !12

13:                                               ; preds = %8
  %14 = trunc nuw nsw i64 %indvars.iv to i32
  %15 = mul i32 %3, 9
  %16 = add i32 %15, -8
  %17 = add i32 %16, %14
  ret i32 %17
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: 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 = !{!6, !9, i64 96}
!6 = !{!"_ZTS6bignum", !7, i64 0, !9, i64 96}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!"int", !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"long long", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass