; LLVM IR from ahr9n/psolving-paradigms :: 4.dynamic-programming/09.grids-and-paths/UVa 825 - Walking on the Safe Side.ll (Z5solveii)

; 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"

@r = external dso_local global i32, align 4
@c = external dso_local global i32, align 4
@dp = external dso_local global [104 x [104 x i32]], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_Z5validii(i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z5solveii(i32 noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = load i32, ptr @r, align 4, !tbaa !5
  %10 = sub nsw i32 %9, 1
  %11 = icmp eq i32 %8, %10
  br i1 %11, label %12, label %18

12:                                               ; preds = %2
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = load i32, ptr @c, align 4, !tbaa !5
  %15 = sub nsw i32 %14, 1
  %16 = icmp eq i32 %13, %15
  br i1 %16, label %17, label %18

17:                                               ; preds = %12
  store i32 1, ptr %3, align 4
  br label %63

18:                                               ; preds = %12, %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [104 x [104 x i32]], ptr @dp, i64 0, i64 %20
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [104 x i32], ptr %21, i64 0, i64 %23
  store ptr %24, ptr %6, align 8, !tbaa !9
  %25 = load ptr, ptr %6, align 8, !tbaa !9
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = xor i32 %26, -1
  %28 = icmp ne i32 %27, 0
  br i1 %28, label %29, label %32

29:                                               ; preds = %18
  %30 = load ptr, ptr %6, align 8, !tbaa !9
  %31 = load i32, ptr %30, align 4, !tbaa !5
  store i32 %31, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %62

32:                                               ; preds = %18
  %33 = load ptr, ptr %6, align 8, !tbaa !9
  store i32 0, ptr %33, align 4, !tbaa !5
  %34 = load i32, ptr %4, align 4, !tbaa !5
  %35 = load i32, ptr %5, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  %37 = call noundef zeroext i1 @_Z5validii(i32 noundef %34, i32 noundef %36)
  br i1 %37, label %38, label %46

38:                                               ; preds = %32
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = load i32, ptr %5, align 4, !tbaa !5
  %41 = add nsw i32 %40, 1
  %42 = call noundef i32 @_Z5solveii(i32 noundef %39, i32 noundef %41)
  %43 = load ptr, ptr %6, align 8, !tbaa !9
  %44 = load i32, ptr %43, align 4, !tbaa !5
  %45 = add nsw i32 %44, %42
  store i32 %45, ptr %43, align 4, !tbaa !5
  br label %46

46:                                               ; preds = %38, %32
  %47 = load i32, ptr %4, align 4, !tbaa !5
  %48 = add nsw i32 %47, 1
  %49 = load i32, ptr %5, align 4, !tbaa !5
  %50 = call noundef zeroext i1 @_Z5validii(i32 noundef %48, i32 noundef %49)
  br i1 %50, label %51, label %59

51:                                               ; preds = %46
  %52 = load i32, ptr %4, align 4, !tbaa !5
  %53 = add nsw i32 %52, 1
  %54 = load i32, ptr %5, align 4, !tbaa !5
  %55 = call noundef i32 @_Z5solveii(i32 noundef %53, i32 noundef %54)
  %56 = load ptr, ptr %6, align 8, !tbaa !9
  %57 = load i32, ptr %56, align 4, !tbaa !5
  %58 = add nsw i32 %57, %55
  store i32 %58, ptr %56, align 4, !tbaa !5
  br label %59

59:                                               ; preds = %51, %46
  %60 = load ptr, ptr %6, align 8, !tbaa !9
  %61 = load i32, ptr %60, align 4, !tbaa !5
  store i32 %61, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %62

62:                                               ; preds = %59, %29
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %63

63:                                               ; preds = %62, %17
  %64 = load i32, ptr %3, align 4
  ret i32 %64
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

attributes #0 = { 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 #1 = { mustprogress 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}


; 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"

@r = external dso_local local_unnamed_addr global i32, align 4
@c = external dso_local local_unnamed_addr global i32, align 4
@dp = external dso_local local_unnamed_addr global [104 x [104 x i32]], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_Z5validii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z5solveii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load i32, ptr @r, align 4, !tbaa !5
  %4 = add nsw i32 %3, -1
  %5 = icmp eq i32 %4, %0
  br i1 %5, label %6, label %10

6:                                                ; preds = %2
  %7 = load i32, ptr @c, align 4, !tbaa !5
  %8 = add nsw i32 %7, -1
  %9 = icmp eq i32 %8, %1
  br i1 %9, label %common.ret, label %10

10:                                               ; preds = %6, %2
  %11 = sext i32 %0 to i64
  %12 = sext i32 %1 to i64
  %13 = getelementptr inbounds [104 x [104 x i32]], ptr @dp, i64 0, i64 %11, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %.not = icmp eq i32 %14, -1
  br i1 %.not, label %15, label %common.ret

15:                                               ; preds = %10
  store i32 0, ptr %13, align 4, !tbaa !5
  %16 = add nsw i32 %1, 1
  %17 = tail call noundef zeroext i1 @_Z5validii(i32 noundef %0, i32 noundef %16)
  br i1 %17, label %18, label %22

18:                                               ; preds = %15
  %19 = tail call noundef i32 @_Z5solveii(i32 noundef %0, i32 noundef %16)
  %20 = load i32, ptr %13, align 4, !tbaa !5
  %21 = add nsw i32 %20, %19
  store i32 %21, ptr %13, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %18, %15
  %23 = add nsw i32 %0, 1
  %24 = tail call noundef zeroext i1 @_Z5validii(i32 noundef %23, i32 noundef %1)
  br i1 %24, label %25, label %._crit_edge

._crit_edge:                                      ; preds = %22
  %.pre = load i32, ptr %13, align 4, !tbaa !5
  br label %common.ret

common.ret:                                       ; preds = %6, %10, %._crit_edge, %25
  %common.ret.op = phi i32 [ %28, %25 ], [ 1, %6 ], [ %14, %10 ], [ %.pre, %._crit_edge ]
  ret i32 %common.ret.op

25:                                               ; preds = %22
  %26 = tail call noundef i32 @_Z5solveii(i32 noundef %23, i32 noundef %1)
  %27 = load i32, ptr %13, align 4, !tbaa !5
  %28 = add nsw i32 %27, %26
  store i32 %28, ptr %13, align 4, !tbaa !5
  br label %common.ret
}

attributes #0 = { 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" }

!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++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass