; LLVM IR from KishanBGajera/2024-366-Days-Of-DSA :: Data Structures/Linear/Queue/Priority Queue/Without Heap/C (main)

; 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"

%struct.PriorityQueue = type { ptr, i32, i32 }
%struct.Item = type { i32, i32 }

; 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: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1

; Function Attrs: nounwind uwtable
declare dso_local i32 @peekPRQ(ptr noundef) #2

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

8:                                                ; preds = %30, %1
  %9 = load i32, ptr %4, align 4, !tbaa !9
  %10 = load ptr, ptr %2, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.PriorityQueue, ptr %10, i32 0, i32 2
  %12 = load i32, ptr %11, align 4, !tbaa !11
  %13 = sub nsw i32 %12, 1
  %14 = icmp slt i32 %9, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %33

16:                                               ; preds = %8
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.PriorityQueue, ptr %17, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  %20 = load i32, ptr %4, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds %struct.Item, ptr %19, i64 %21
  %23 = load ptr, ptr %2, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.PriorityQueue, ptr %23, i32 0, i32 0
  %25 = load ptr, ptr %24, align 8, !tbaa !13
  %26 = load i32, ptr %4, align 4, !tbaa !9
  %27 = add nsw i32 %26, 1
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds %struct.Item, ptr %25, i64 %28
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %22, ptr align 4 %29, i64 8, i1 false), !tbaa.struct !14
  br label %30

30:                                               ; preds = %16
  %31 = load i32, ptr %4, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %4, align 4, !tbaa !9
  br label %8, !llvm.loop !15

33:                                               ; preds = %15
  %34 = load ptr, ptr %2, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.PriorityQueue, ptr %34, i32 0, i32 2
  %36 = load i32, ptr %35, align 4, !tbaa !11
  %37 = add nsw i32 %36, -1
  store i32 %37, ptr %35, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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 = !{!"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 = !{!12, !10, i64 12}
!12 = !{!"PriorityQueue", !6, i64 0, !10, i64 8, !10, i64 12}
!13 = !{!12, !6, i64 0}
!14 = !{i64 0, i64 4, !9, i64 4, i64 4, !9}
!15 = distinct !{!15, !16}
!16 = !{!"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"

%struct.Item = type { i32, i32 }

; Function Attrs: nounwind uwtable
declare dso_local i32 @peekPRQ(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @dequeueFromPRQ(ptr noundef %0) local_unnamed_addr #0 {
  %2 = tail call i32 @peekPRQ(ptr noundef %0)
  %3 = getelementptr inbounds i8, ptr %0, i64 12
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  %6 = icmp slt i32 %2, %5
  br i1 %6, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %7 = sext i32 %2 to i64
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.lcssa = phi i32 [ %5, %1 ], [ %13, %.lr.ph ]
  store i32 %.lcssa, ptr %3, align 4, !tbaa !5
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %7, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %8 = load ptr, ptr %0, align 8, !tbaa !11
  %9 = getelementptr inbounds %struct.Item, ptr %8, i64 %indvars.iv
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %10 = getelementptr inbounds %struct.Item, ptr %8, i64 %indvars.iv.next
  %11 = load i64, ptr %10, align 4
  store i64 %11, ptr %9, align 4
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = add nsw i32 %12, -1
  %14 = sext i32 %13 to i64
  %15 = icmp slt i64 %indvars.iv.next, %14
  br i1 %15, label %.lr.ph, label %._crit_edge, !llvm.loop !12
}

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" }

!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, !10, i64 12}
!6 = !{!"PriorityQueue", !7, i64 0, !10, i64 8, !10, i64 12}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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