; LLVM IR from imteekay/algorithms :: competitive-programming/acm-icpc-br/regionals_2011/pascal.ll (Z16triangulo_pascalii)

; 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: mustprogress uwtable
define dso_local noundef i32 @_Z16triangulo_pascalii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %21, label %8

8:                                                ; preds = %2
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %21, label %11

11:                                               ; preds = %8
  %12 = load i32, ptr %5, align 4, !tbaa !5
  %13 = icmp eq i32 %12, 1
  br i1 %13, label %14, label %17

14:                                               ; preds = %11
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = icmp eq i32 %15, 1
  br i1 %16, label %21, label %17

17:                                               ; preds = %14, %11
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = icmp eq i32 %18, %19
  br i1 %20, label %21, label %22

21:                                               ; preds = %17, %14, %8, %2
  store i32 1, ptr %3, align 4
  br label %33

22:                                               ; preds = %17
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = sub nsw i32 %23, 1
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = call noundef i32 @_Z16triangulo_pascalii(i32 noundef %24, i32 noundef %25)
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = sub nsw i32 %27, 1
  %29 = load i32, ptr %5, align 4, !tbaa !5
  %30 = sub nsw i32 %29, 1
  %31 = call noundef i32 @_Z16triangulo_pascalii(i32 noundef %28, i32 noundef %30)
  %32 = add nsw i32 %26, %31
  store i32 %32, ptr %3, align 4
  br label %33

33:                                               ; preds = %22, %21
  %34 = load i32, ptr %3, align 4
  ret i32 %34
}

attributes #0 = { 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" }

!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"}


; 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: mustprogress nofree nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z16triangulo_pascalii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i32 %1, 0
  %4 = icmp eq i32 %0, 0
  %or.cond18 = or i1 %4, %3
  br i1 %or.cond18, label %tailrecurse._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %tailrecurse
  %.tr1721 = phi i32 [ %10, %tailrecurse ], [ %1, %2 ]
  %.tr20 = phi i32 [ %8, %tailrecurse ], [ %0, %2 ]
  %accumulator.tr19 = phi i32 [ %11, %tailrecurse ], [ 0, %2 ]
  %5 = icmp eq i32 %.tr1721, 1
  %6 = icmp eq i32 %.tr20, 1
  %or.cond3 = and i1 %6, %5
  %7 = icmp eq i32 %.tr1721, %.tr20
  %or.cond16 = or i1 %7, %or.cond3
  br i1 %or.cond16, label %tailrecurse._crit_edge.loopexit, label %tailrecurse

tailrecurse:                                      ; preds = %.lr.ph
  %8 = add nsw i32 %.tr20, -1
  %9 = tail call noundef i32 @_Z16triangulo_pascalii(i32 noundef %8, i32 noundef %.tr1721)
  %10 = add nsw i32 %.tr1721, -1
  %11 = add nsw i32 %9, %accumulator.tr19
  %12 = icmp eq i32 %10, 0
  %13 = icmp eq i32 %8, 0
  %or.cond = or i1 %13, %12
  br i1 %or.cond, label %tailrecurse._crit_edge.loopexit, label %.lr.ph

tailrecurse._crit_edge.loopexit:                  ; preds = %tailrecurse, %.lr.ph
  %accumulator.tr.lcssa.ph = phi i32 [ %accumulator.tr19, %.lr.ph ], [ %11, %tailrecurse ]
  %14 = add nsw i32 %accumulator.tr.lcssa.ph, 1
  br label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %tailrecurse._crit_edge.loopexit, %2
  %accumulator.tr.lcssa = phi i32 [ 1, %2 ], [ %14, %tailrecurse._crit_edge.loopexit ]
  ret i32 %accumulator.tr.lcssa
}

attributes #0 = { mustprogress nofree nosync nounwind willreturn 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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass