; LLVM IR from ravireddy07/cpp-book :: src/Fibonacci/all-fibonacci-solutions.ll (Z9usingLoopi)

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z9usingLoopi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = 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 0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 1, ptr %5, align 4, !tbaa !5
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = sub nsw i32 %7, 1
  store i32 %8, ptr %2, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %13, %1
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = add nsw i32 %10, -1
  store i32 %11, ptr %2, align 4, !tbaa !5
  %12 = icmp ne i32 %10, 0
  br i1 %12, label %13, label %24

13:                                               ; preds = %9
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = add nsw i32 %14, %15
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = add nsw i32 %17, %16
  store i32 %18, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %19 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %19, ptr %6, align 4, !tbaa !5
  %20 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %20, ptr %4, align 4, !tbaa !5
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = add nsw i32 %21, %22
  store i32 %23, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %9, !llvm.loop !9

24:                                               ; preds = %9
  %25 = load i32, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %25
}

; 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z9usingLoopi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = add nsw i32 %0, -1
  %xtraiter = and i32 %0, 7
  %3 = icmp ult i32 %2, 7
  br i1 %3, label %.unr-lcssa, label %.new

.new:                                             ; preds = %1
  %unroll_iter = and i32 %0, -8
  br label %4

4:                                                ; preds = %4, %.new
  %.011 = phi i32 [ 0, %.new ], [ %11, %4 ]
  %.010 = phi i32 [ 1, %.new ], [ %12, %4 ]
  %niter = phi i32 [ 0, %.new ], [ %niter.next.7, %4 ]
  %5 = add nsw i32 %.010, %.011
  %6 = add nsw i32 %5, %.010
  %7 = add nsw i32 %6, %5
  %8 = add nsw i32 %7, %6
  %9 = add nsw i32 %8, %7
  %10 = add nsw i32 %9, %8
  %11 = add nsw i32 %10, %9
  %12 = add nsw i32 %11, %10
  %niter.next.7 = add i32 %niter, 8
  %niter.ncmp.7 = icmp eq i32 %niter.next.7, %unroll_iter
  br i1 %niter.ncmp.7, label %.unr-lcssa, label %4, !llvm.loop !5

.unr-lcssa:                                       ; preds = %4, %1
  %.010.lcssa.ph = phi i32 [ poison, %1 ], [ %11, %4 ]
  %.011.unr = phi i32 [ 0, %1 ], [ %11, %4 ]
  %.010.unr = phi i32 [ 1, %1 ], [ %12, %4 ]
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.epilog-lcssa, label %.epil.preheader

.epil.preheader:                                  ; preds = %.unr-lcssa, %.epil.preheader
  %.011.epil = phi i32 [ %.010.epil, %.epil.preheader ], [ %.011.unr, %.unr-lcssa ]
  %.010.epil = phi i32 [ %13, %.epil.preheader ], [ %.010.unr, %.unr-lcssa ]
  %epil.iter = phi i32 [ %epil.iter.next, %.epil.preheader ], [ 0, %.unr-lcssa ]
  %13 = add nsw i32 %.010.epil, %.011.epil
  %epil.iter.next = add i32 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i32 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %.epilog-lcssa, label %.epil.preheader, !llvm.loop !7

.epilog-lcssa:                                    ; preds = %.epil.preheader, %.unr-lcssa
  %.010.lcssa = phi i32 [ %.010.lcssa.ph, %.unr-lcssa ], [ %.010.epil, %.epil.preheader ]
  ret i32 %.010.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = distinct !{!7, !8}
!8 = !{!"llvm.loop.unroll.disable"}


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