; LLVM IR from kazunetakahashi/atcoder :: 2018/0714_AGC026/B.ll (Z3gcdxx)

; 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 i64 @_Z3gcdxx(i64 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  store i64 %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !5
  %6 = load i64, ptr %5, align 8, !tbaa !5
  %7 = icmp eq i64 %6, 0
  br i1 %7, label %8, label %10

8:                                                ; preds = %2
  %9 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %9, ptr %3, align 8
  br label %24

10:                                               ; preds = %2
  %11 = load i64, ptr %4, align 8, !tbaa !5
  %12 = load i64, ptr %5, align 8, !tbaa !5
  %13 = icmp slt i64 %11, %12
  br i1 %13, label %14, label %18

14:                                               ; preds = %10
  %15 = load i64, ptr %5, align 8, !tbaa !5
  %16 = load i64, ptr %4, align 8, !tbaa !5
  %17 = call noundef i64 @_Z3gcdxx(i64 noundef %15, i64 noundef %16)
  store i64 %17, ptr %3, align 8
  br label %24

18:                                               ; preds = %10
  %19 = load i64, ptr %5, align 8, !tbaa !5
  %20 = load i64, ptr %4, align 8, !tbaa !5
  %21 = load i64, ptr %5, align 8, !tbaa !5
  %22 = srem i64 %20, %21
  %23 = call noundef i64 @_Z3gcdxx(i64 noundef %19, i64 noundef %22)
  store i64 %23, ptr %3, align 8
  br label %24

24:                                               ; preds = %18, %14, %8
  %25 = load i64, ptr %3, align 8
  ret i64 %25
}

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 = !{!"long long", !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 norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i64 @_Z3gcdxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i64 %1, 0
  br i1 %3, label %tailrecurse._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %tailrecurse.backedge
  %.tr1214 = phi i64 [ %.tr12.be, %tailrecurse.backedge ], [ %1, %2 ]
  %.tr13 = phi i64 [ %.tr1214, %tailrecurse.backedge ], [ %0, %2 ]
  %4 = icmp slt i64 %.tr13, %.tr1214
  br i1 %4, label %tailrecurse.backedge, label %5

5:                                                ; preds = %.lr.ph
  %6 = srem i64 %.tr13, %.tr1214
  br label %tailrecurse.backedge

tailrecurse.backedge:                             ; preds = %5, %.lr.ph
  %.tr12.be = phi i64 [ %6, %5 ], [ %.tr13, %.lr.ph ]
  %7 = icmp eq i64 %.tr12.be, 0
  br i1 %7, label %tailrecurse._crit_edge, label %.lr.ph

tailrecurse._crit_edge:                           ; preds = %tailrecurse.backedge, %2
  %.tr.lcssa = phi i64 [ %0, %2 ], [ %.tr1214, %tailrecurse.backedge ]
  ret i64 %.tr.lcssa
}

attributes #0 = { mustprogress nofree norecurse 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: GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass