; LLVM IR from VastoLorde95/Competitive-Programming :: CodeChef/WF/Easy Medium/SFUNC/A.ll (Z4fastxx)

; 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"

@MOD = external dso_local global i64, align 8

; 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 uwtable
define dso_local noundef i64 @_Z4fastxx(i64 noundef %0, i64 noundef %1) #1 {
  %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
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %6 = load i64, ptr @MOD, align 8, !tbaa !5
  %7 = srem i64 1, %6
  store i64 %7, ptr %5, align 8, !tbaa !5
  %8 = load i64, ptr @MOD, align 8, !tbaa !5
  %9 = load i64, ptr %3, align 8, !tbaa !5
  %10 = srem i64 %9, %8
  store i64 %10, ptr %3, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %22, %2
  %12 = load i64, ptr %4, align 8, !tbaa !5
  %13 = icmp ne i64 %12, 0
  br i1 %13, label %14, label %28

14:                                               ; preds = %11
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = and i64 %15, 1
  %17 = icmp ne i64 %16, 0
  br i1 %17, label %18, label %22

18:                                               ; preds = %14
  %19 = load i64, ptr %5, align 8, !tbaa !5
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = call noundef i64 @_Z4mul2xx(i64 noundef %19, i64 noundef %20)
  store i64 %21, ptr %5, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %18, %14
  %23 = load i64, ptr %3, align 8, !tbaa !5
  %24 = load i64, ptr %3, align 8, !tbaa !5
  %25 = call noundef i64 @_Z4mul2xx(i64 noundef %23, i64 noundef %24)
  store i64 %25, ptr %3, align 8, !tbaa !5
  %26 = load i64, ptr %4, align 8, !tbaa !5
  %27 = ashr i64 %26, 1
  store i64 %27, ptr %4, align 8, !tbaa !5
  br label %11, !llvm.loop !9

28:                                               ; preds = %11
  %29 = load i64, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret i64 %29
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i64 @_Z4mul2xx(i64 noundef, i64 noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { inlinehint 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 #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"

@MOD = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z4fastxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = load i64, ptr @MOD, align 8, !tbaa !5
  %4 = srem i64 1, %3
  %.not12 = icmp eq i64 %1, 0
  br i1 %.not12, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %5 = srem i64 %0, %3
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %9
  %.015 = phi i64 [ %.1, %9 ], [ %4, %.lr.ph.preheader ]
  %.0914 = phi i64 [ %11, %9 ], [ %1, %.lr.ph.preheader ]
  %.01013 = phi i64 [ %10, %9 ], [ %5, %.lr.ph.preheader ]
  %6 = and i64 %.0914, 1
  %.not11 = icmp eq i64 %6, 0
  br i1 %.not11, label %9, label %7

7:                                                ; preds = %.lr.ph
  %8 = tail call noundef i64 @_Z4mul2xx(i64 noundef %.015, i64 noundef %.01013)
  br label %9

9:                                                ; preds = %7, %.lr.ph
  %.1 = phi i64 [ %8, %7 ], [ %.015, %.lr.ph ]
  %10 = tail call noundef i64 @_Z4mul2xx(i64 noundef %.01013, i64 noundef %.01013)
  %11 = ashr i64 %.0914, 1
  %.not = icmp ult i64 %.0914, 2
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %9, %2
  %.0.lcssa = phi i64 [ %4, %2 ], [ %.1, %9 ]
  ret i64 %.0.lcssa
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i64 @_Z4mul2xx(i64 noundef, i64 noundef) local_unnamed_addr #1

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 = { inlinehint 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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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