; LLVM IR from Mohammed-Shoaib/Coding-Problems :: HackerRank/C/Easy (E0010)

; 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: nounwind uwtable
define dso_local i32 @marks_summation(ptr noundef %0, i32 noundef %1, i8 noundef signext %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i8, align 1
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i8 %2, ptr %6, align 1, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %9 = load i8, ptr %6, align 1, !tbaa !11
  %10 = sext i8 %9 to i32
  %11 = icmp eq i32 %10, 103
  %12 = zext i1 %11 to i32
  store i32 %12, ptr %8, align 4, !tbaa !9
  br label %13

13:                                               ; preds = %26, %3
  %14 = load i32, ptr %8, align 4, !tbaa !9
  %15 = load i32, ptr %5, align 4, !tbaa !9
  %16 = icmp slt i32 %14, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %29

18:                                               ; preds = %13
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = load i32, ptr %8, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i32, ptr %19, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !9
  %24 = load i32, ptr %7, align 4, !tbaa !9
  %25 = add nsw i32 %24, %23
  store i32 %25, ptr %7, align 4, !tbaa !9
  br label %26

26:                                               ; preds = %18
  %27 = load i32, ptr %8, align 4, !tbaa !9
  %28 = add nsw i32 %27, 2
  store i32 %28, ptr %8, align 4, !tbaa !9
  br label %13, !llvm.loop !12

29:                                               ; preds = %17
  %30 = load i32, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %30
}

; 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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @marks_summation(ptr nocapture noundef readonly %0, i32 noundef %1, i8 noundef signext %2) local_unnamed_addr #0 {
  %4 = icmp eq i8 %2, 103
  %5 = zext i1 %4 to i32
  %6 = icmp slt i32 %5, %1
  br i1 %6, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %7 = zext i1 %4 to i64
  %8 = zext nneg i32 %1 to i64
  %9 = select i1 %4, i64 3, i64 2
  %umax = tail call i64 @llvm.umax.i64(i64 %9, i64 %8)
  %10 = xor i64 %7, -1
  %11 = add nsw i64 %umax, %10
  %min.iters.check = icmp ult i64 %11, 16
  br i1 %min.iters.check, label %.lr.ph.preheader14, label %vector.ph

.lr.ph.preheader14:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ %7, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.078.ph = phi i32 [ 0, %.lr.ph.preheader ], [ %24, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %12 = lshr i64 %11, 1
  %13 = add nuw nsw i64 %12, 1
  %n.mod.vf = and i64 %13, 7
  %14 = icmp eq i64 %n.mod.vf, 0
  %15 = select i1 %14, i64 8, i64 %n.mod.vf
  %n.vec = sub nsw i64 %13, %15
  %16 = shl i64 %n.vec, 1
  %ind.end = or disjoint i64 %16, %7
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %21, %vector.body ]
  %vec.phi11 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %22, %vector.body ]
  %17 = shl i64 %index, 1
  %offset.idx = or disjoint i64 %17, %7
  %18 = or disjoint i64 %offset.idx, 8
  %19 = getelementptr inbounds i32, ptr %0, i64 %offset.idx
  %20 = getelementptr inbounds i32, ptr %0, i64 %18
  %wide.vec = load <8 x i32>, ptr %19, align 4, !tbaa !5
  %wide.vec12 = load <8 x i32>, ptr %20, align 4, !tbaa !5
  %strided.vec = shufflevector <8 x i32> %wide.vec, <8 x i32> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
  %strided.vec13 = shufflevector <8 x i32> %wide.vec12, <8 x i32> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
  %21 = add <4 x i32> %strided.vec, %vec.phi
  %22 = add <4 x i32> %strided.vec13, %vec.phi11
  %index.next = add nuw i64 %index, 8
  %23 = icmp eq i64 %index.next, %n.vec
  br i1 %23, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %22, %21
  %24 = tail call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %bin.rdx)
  br label %.lr.ph.preheader14

._crit_edge:                                      ; preds = %.lr.ph, %3
  %.07.lcssa = phi i32 [ 0, %3 ], [ %27, %.lr.ph ]
  ret i32 %.07.lcssa

.lr.ph:                                           ; preds = %.lr.ph.preheader14, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader14 ]
  %.078 = phi i32 [ %27, %.lr.ph ], [ %.078.ph, %.lr.ph.preheader14 ]
  %25 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = add nsw i32 %26, %.078
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 2
  %28 = icmp ult i64 %indvars.iv.next, %8
  br i1 %28, label %.lr.ph, label %._crit_edge, !llvm.loop !13
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.umax.i64(i64, i64) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v4i32(<4 x i32>) #1

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 speculatable willreturn memory(none) }

!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/C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}


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