; LLVM IR from HarshCasper/NeoAlgo :: C/operating_system (first_come_first_serve_algorithm)

; 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: 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: nounwind uwtable
define dso_local void @turnaroundtime(ptr noundef %0, i32 noundef %1, ptr noundef %2, ptr noundef %3, ptr noundef %4) #1 {
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca ptr, align 8
  %11 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store i32 %1, ptr %7, align 4, !tbaa !9
  store ptr %2, ptr %8, align 8, !tbaa !5
  store ptr %3, ptr %9, align 8, !tbaa !5
  store ptr %4, ptr %10, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  store i32 0, ptr %11, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %32, %5
  %13 = load i32, ptr %11, align 4, !tbaa !9
  %14 = load i32, ptr %7, align 4, !tbaa !9
  %15 = icmp slt i32 %13, %14
  br i1 %15, label %16, label %35

16:                                               ; preds = %12
  %17 = load ptr, ptr %8, align 8, !tbaa !5
  %18 = load i32, ptr %11, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i32, ptr %17, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = load ptr, ptr %9, align 8, !tbaa !5
  %23 = load i32, ptr %11, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i32, ptr %22, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !9
  %27 = add nsw i32 %21, %26
  %28 = load ptr, ptr %10, align 8, !tbaa !5
  %29 = load i32, ptr %11, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  store i32 %27, ptr %31, align 4, !tbaa !9
  br label %32

32:                                               ; preds = %16
  %33 = load i32, ptr %11, align 4, !tbaa !9
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %11, align 4, !tbaa !9
  br label %12, !llvm.loop !11

35:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { 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 = distinct !{!11, !12}
!12 = !{!"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: readwrite) uwtable
define dso_local void @turnaroundtime(ptr nocapture noundef readnone %0, i32 noundef %1, ptr nocapture noundef readonly %2, ptr nocapture noundef readonly %3, ptr nocapture noundef writeonly %4) local_unnamed_addr #0 {
  %6 = ptrtoint ptr %3 to i64
  %7 = ptrtoint ptr %2 to i64
  %8 = ptrtoint ptr %4 to i64
  %9 = icmp sgt i32 %1, 0
  br i1 %9, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %5
  %wide.trip.count = zext nneg i32 %1 to i64
  %min.iters.check = icmp ult i32 %1, 12
  br i1 %min.iters.check, label %.lr.ph.preheader14, label %vector.memcheck

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %10 = sub i64 %8, %7
  %diff.check = icmp ult i64 %10, 32
  %11 = sub i64 %8, %6
  %diff.check10 = icmp ult i64 %11, 32
  %conflict.rdx = or i1 %diff.check, %diff.check10
  br i1 %conflict.rdx, label %.lr.ph.preheader14, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %wide.trip.count, 2147483640
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %12 = getelementptr inbounds i32, ptr %2, i64 %index
  %13 = getelementptr inbounds i8, ptr %12, i64 16
  %wide.load = load <4 x i32>, ptr %12, align 4, !tbaa !5
  %wide.load11 = load <4 x i32>, ptr %13, align 4, !tbaa !5
  %14 = getelementptr inbounds i32, ptr %3, i64 %index
  %15 = getelementptr inbounds i8, ptr %14, i64 16
  %wide.load12 = load <4 x i32>, ptr %14, align 4, !tbaa !5
  %wide.load13 = load <4 x i32>, ptr %15, align 4, !tbaa !5
  %16 = add nsw <4 x i32> %wide.load12, %wide.load
  %17 = add nsw <4 x i32> %wide.load13, %wide.load11
  %18 = getelementptr inbounds i32, ptr %4, i64 %index
  %19 = getelementptr inbounds i8, ptr %18, i64 16
  store <4 x i32> %16, ptr %18, align 4, !tbaa !5
  store <4 x i32> %17, ptr %19, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %20 = icmp eq i64 %index.next, %n.vec
  br i1 %20, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader14

.lr.ph.preheader14:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %vector.memcheck ], [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %xtraiter = and i64 %wide.trip.count, 3
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader14, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader14 ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader14 ]
  %21 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv.prol
  %22 = load i32, ptr %21, align 4, !tbaa !5
  %23 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv.prol
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = add nsw i32 %24, %22
  %26 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv.prol
  store i32 %25, ptr %26, align 4, !tbaa !5
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !13

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader14
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader14 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %27 = sub nsw i64 %indvars.iv.ph, %wide.trip.count
  %28 = icmp ugt i64 %27, -4
  br i1 %28, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %.lr.ph ], [ %indvars.iv.unr, %.lr.ph.prol.loopexit ]
  %29 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv
  %30 = load i32, ptr %29, align 4, !tbaa !5
  %31 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = add nsw i32 %32, %30
  %34 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv
  store i32 %33, ptr %34, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %35 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv.next
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv.next
  %38 = load i32, ptr %37, align 4, !tbaa !5
  %39 = add nsw i32 %38, %36
  %40 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv.next
  store i32 %39, ptr %40, align 4, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %41 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv.next.1
  %42 = load i32, ptr %41, align 4, !tbaa !5
  %43 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv.next.1
  %44 = load i32, ptr %43, align 4, !tbaa !5
  %45 = add nsw i32 %44, %42
  %46 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv.next.1
  store i32 %45, ptr %46, align 4, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %47 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv.next.2
  %48 = load i32, ptr %47, align 4, !tbaa !5
  %49 = getelementptr inbounds i32, ptr %3, i64 %indvars.iv.next.2
  %50 = load i32, ptr %49, align 4, !tbaa !5
  %51 = add nsw i32 %50, %48
  %52 = getelementptr inbounds i32, ptr %4, i64 %indvars.iv.next.2
  store i32 %51, ptr %52, align 4, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %wide.trip.count
  br i1 %exitcond.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %5
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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/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, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !10, !11}


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