; LLVM IR from bqi343/cp-notebook :: Contests/USACO Solutions/2014-15/Dec 2014 Gold/14 Dec G2.ll (Z4qsumii)

; 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"

@segsum = external dso_local global [200000 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z4qsumii(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 %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = add nsw i32 %6, 100000
  store i32 %7, ptr %3, align 4, !tbaa !5
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = add nsw i32 %8, 100000
  store i32 %9, ptr %4, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %39, %2
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %14, label %44

14:                                               ; preds = %10
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = and i32 %15, 1
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %18, label %26

18:                                               ; preds = %14
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %3, align 4, !tbaa !5
  %21 = sext i32 %19 to i64
  %22 = getelementptr inbounds [200000 x i32], ptr @segsum, i64 0, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !5
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = add nsw i32 %24, %23
  store i32 %25, ptr %5, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %18, %14
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = and i32 %27, 1
  %29 = icmp ne i32 %28, 0
  br i1 %29, label %30, label %38

30:                                               ; preds = %26
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = add nsw i32 %31, -1
  store i32 %32, ptr %4, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [200000 x i32], ptr @segsum, i64 0, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !5
  %36 = load i32, ptr %5, align 4, !tbaa !5
  %37 = add nsw i32 %36, %35
  store i32 %37, ptr %5, align 4, !tbaa !5
  br label %38

38:                                               ; preds = %30, %26
  br label %39

39:                                               ; preds = %38
  %40 = load i32, ptr %3, align 4, !tbaa !5
  %41 = ashr i32 %40, 1
  store i32 %41, ptr %3, align 4, !tbaa !5
  %42 = load i32, ptr %4, align 4, !tbaa !5
  %43 = ashr i32 %42, 1
  store i32 %43, ptr %4, align 4, !tbaa !5
  br label %10, !llvm.loop !9

44:                                               ; preds = %10
  %45 = load i32, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %45
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 = !{!"int", !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"

@segsum = external dso_local local_unnamed_addr global [200000 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z4qsumii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, %1
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %4 = add nsw i32 %1, 100000
  %5 = add nsw i32 %0, 100000
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %21
  %.020 = phi i32 [ %.2, %21 ], [ 0, %.lr.ph.preheader ]
  %.01319 = phi i32 [ %23, %21 ], [ %4, %.lr.ph.preheader ]
  %.01518 = phi i32 [ %22, %21 ], [ %5, %.lr.ph.preheader ]
  %6 = and i32 %.01518, 1
  %.not = icmp eq i32 %6, 0
  br i1 %.not, label %13, label %7

7:                                                ; preds = %.lr.ph
  %8 = add nsw i32 %.01518, 1
  %9 = sext i32 %.01518 to i64
  %10 = getelementptr inbounds [200000 x i32], ptr @segsum, i64 0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = add nsw i32 %11, %.020
  br label %13

13:                                               ; preds = %7, %.lr.ph
  %.116 = phi i32 [ %8, %7 ], [ %.01518, %.lr.ph ]
  %.1 = phi i32 [ %12, %7 ], [ %.020, %.lr.ph ]
  %14 = and i32 %.01319, 1
  %.not17 = icmp eq i32 %14, 0
  br i1 %.not17, label %21, label %15

15:                                               ; preds = %13
  %16 = add nsw i32 %.01319, -1
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [200000 x i32], ptr @segsum, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = add nsw i32 %19, %.1
  br label %21

21:                                               ; preds = %13, %15
  %.114 = phi i32 [ %16, %15 ], [ %.01319, %13 ]
  %.2 = phi i32 [ %20, %15 ], [ %.1, %13 ]
  %22 = ashr i32 %.116, 1
  %23 = ashr i32 %.114, 1
  %24 = icmp slt i32 %22, %23
  br i1 %24, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %21, %2
  %.0.lcssa = phi i32 [ 0, %2 ], [ %.2, %21 ]
  ret i32 %.0.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: 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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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