; LLVM IR from tangjz/acm-icpc :: TDL_training/2015-10-05/E - Equation - lzy.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 %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !5
  %6 = load i64, ptr %3, align 8, !tbaa !5
  %7 = call noundef i64 @_Z3absIxET_S0_(i64 noundef %6)
  store i64 %7, ptr %3, align 8, !tbaa !5
  %8 = load i64, ptr %4, align 8, !tbaa !5
  %9 = call noundef i64 @_Z3absIxET_S0_(i64 noundef %8)
  store i64 %9, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  br label %10

10:                                               ; preds = %15, %2
  %11 = load i64, ptr %4, align 8, !tbaa !5
  %12 = icmp ne i64 %11, 0
  br i1 %12, label %14, label %13

13:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  br label %21

14:                                               ; preds = %10
  br label %15

15:                                               ; preds = %14
  %16 = load i64, ptr %3, align 8, !tbaa !5
  %17 = load i64, ptr %4, align 8, !tbaa !5
  %18 = srem i64 %16, %17
  store i64 %18, ptr %5, align 8, !tbaa !5
  %19 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %19, ptr %3, align 8, !tbaa !5
  %20 = load i64, ptr %5, align 8, !tbaa !5
  store i64 %20, ptr %4, align 8, !tbaa !5
  br label %10, !llvm.loop !9

21:                                               ; preds = %13
  %22 = load i64, ptr %3, align 8, !tbaa !5
  ret i64 %22
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z3absIxET_S0_(i64 noundef) #1

; 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 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 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 = { 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z3gcdxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = tail call noundef i64 @_Z3absIxET_S0_(i64 noundef %0)
  %4 = tail call noundef i64 @_Z3absIxET_S0_(i64 noundef %1)
  %.not9 = icmp eq i64 %4, 0
  br i1 %.not9, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.0.lcssa = phi i64 [ %3, %2 ], [ %.0810, %.lr.ph ]
  ret i64 %.0.lcssa

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.011 = phi i64 [ %.0810, %.lr.ph ], [ %3, %2 ]
  %.0810 = phi i64 [ %5, %.lr.ph ], [ %4, %2 ]
  %5 = srem i64 %.011, %.0810
  %.not = icmp eq i64 %5, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z3absIxET_S0_(i64 noundef) local_unnamed_addr #0

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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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