; LLVM IR from VastoLorde95/Competitive-Programming :: CodeChef/IPC/IPC15P1A/Problem G/G.ll (Z1xi)

; 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: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z1Cii(i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z1xi(i32 noundef %0) #1 {
  %2 = alloca i64, align 8
  %3 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = icmp eq i32 %4, 1
  br i1 %5, label %6, label %7

6:                                                ; preds = %1
  store i64 1, ptr %2, align 8
  br label %25

7:                                                ; preds = %1
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = sdiv i32 %8, 2
  %10 = call noundef i64 @_Z1xi(i32 noundef %9)
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = sdiv i32 %11, 2
  %13 = call noundef i64 @_Z1xi(i32 noundef %12)
  %14 = mul nsw i64 %10, %13
  %15 = load i64, ptr @MOD, align 8, !tbaa !9
  %16 = srem i64 %14, %15
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = sub nsw i32 %17, 1
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = sdiv i32 %19, 2
  %21 = call noundef i64 @_Z1Cii(i32 noundef %18, i32 noundef %20)
  %22 = mul nsw i64 %16, %21
  %23 = load i64, ptr @MOD, align 8, !tbaa !9
  %24 = srem i64 %22, %23
  store i64 %24, ptr %2, align 8
  br label %25

25:                                               ; preds = %7, %6
  %26 = load i64, ptr %2, align 8
  ret i64 %26
}

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" }

!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 = !{!"long long", !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"

@MOD = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z1Cii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z1xi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i32 %0, 1
  br i1 %2, label %common.ret7, label %3

common.ret7:                                      ; preds = %1, %3
  %common.ret7.op = phi i64 [ %14, %3 ], [ 1, %1 ]
  ret i64 %common.ret7.op

3:                                                ; preds = %1
  %4 = sdiv i32 %0, 2
  %5 = tail call noundef i64 @_Z1xi(i32 noundef %4)
  %6 = tail call noundef i64 @_Z1xi(i32 noundef %4)
  %7 = mul nsw i64 %6, %5
  %8 = load i64, ptr @MOD, align 8, !tbaa !5
  %9 = srem i64 %7, %8
  %10 = add nsw i32 %0, -1
  %11 = tail call noundef i64 @_Z1Cii(i32 noundef %10, i32 noundef %4)
  %12 = mul nsw i64 %11, %9
  %13 = load i64, ptr @MOD, align 8, !tbaa !5
  %14 = srem i64 %12, %13
  br label %common.ret7
}

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


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass