; LLVM IR from Dev-XYS/Algorithms :: Bellman-Ford(Queue-Optimised).ll (Z21initial_single_sourcei)

; 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.vertex = type { i32, i32 }

@V = external dso_local global [100010 x %struct.vertex], align 16
@ivc = external dso_local global i32, align 4

; 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: mustprogress nounwind uwtable
define dso_local void @_Z21initial_single_sourcei(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 1, ptr %3, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %14, %1
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = load i32, ptr @ivc, align 4, !tbaa !5
  %7 = icmp sle i32 %5, %6
  br i1 %7, label %9, label %8

8:                                                ; preds = %4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  br label %17

9:                                                ; preds = %4
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %11
  %13 = getelementptr inbounds %struct.vertex, ptr %12, i32 0, i32 1
  store i32 1000000000, ptr %13, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %9
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr %3, align 4, !tbaa !5
  br label %4, !llvm.loop !11

17:                                               ; preds = %8
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %19
  %21 = getelementptr inbounds %struct.vertex, ptr %20, i32 0, i32 1
  store i32 0, ptr %21, align 4, !tbaa !9
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!10, !6, i64 4}
!10 = !{!"_ZTS6vertex", !6, i64 0, !6, i64 4}
!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"

%struct.vertex = type { i32, i32 }

@V = external dso_local local_unnamed_addr global [100010 x %struct.vertex], align 16
@ivc = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z21initial_single_sourcei(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @ivc, align 4, !tbaa !5
  %.not4 = icmp slt i32 %2, 1
  br i1 %.not4, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %3 = zext nneg i32 %2 to i64
  %xtraiter = and i64 %3, 7
  %4 = icmp ult i32 %2, 8
  br i1 %4, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %3, 2147483640
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %indvars.iv.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next.7, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.lr.ph.epil ], [ %indvars.iv.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %5 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %indvars.iv.epil, i32 1
  store i32 1000000000, ptr %5, align 4, !tbaa !9
  %indvars.iv.next.epil = add nuw nsw i64 %indvars.iv.epil, 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !11

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %1
  %6 = sext i32 %0 to i64
  %7 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %6, i32 1
  store i32 0, ptr %7, align 4, !tbaa !9
  ret void

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader.new ], [ %indvars.iv.next.7, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.7, %.lr.ph ]
  %8 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %indvars.iv, i32 1
  store i32 1000000000, ptr %8, align 4, !tbaa !9
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %9 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %indvars.iv.next, i32 1
  store i32 1000000000, ptr %9, align 4, !tbaa !9
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %10 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %indvars.iv.next.1, i32 1
  store i32 1000000000, ptr %10, align 4, !tbaa !9
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %11 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %indvars.iv.next.2, i32 1
  store i32 1000000000, ptr %11, align 4, !tbaa !9
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %12 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %indvars.iv.next.3, i32 1
  store i32 1000000000, ptr %12, align 4, !tbaa !9
  %indvars.iv.next.4 = add nuw nsw i64 %indvars.iv, 5
  %13 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %indvars.iv.next.4, i32 1
  store i32 1000000000, ptr %13, align 4, !tbaa !9
  %indvars.iv.next.5 = add nuw nsw i64 %indvars.iv, 6
  %14 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %indvars.iv.next.5, i32 1
  store i32 1000000000, ptr %14, align 4, !tbaa !9
  %indvars.iv.next.6 = add nuw nsw i64 %indvars.iv, 7
  %15 = getelementptr inbounds [100010 x %struct.vertex], ptr @V, i64 0, i64 %indvars.iv.next.6, i32 1
  store i32 1000000000, ptr %15, align 4, !tbaa !9
  %indvars.iv.next.7 = add nuw nsw i64 %indvars.iv, 8
  %niter.next.7 = add i64 %niter, 8
  %niter.ncmp.7 = icmp eq i64 %niter.next.7, %unroll_iter
  br i1 %niter.ncmp.7, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !13
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, 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 = !{!10, !6, i64 4}
!10 = !{!"_ZTS6vertex", !6, i64 0, !6, i64 4}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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