; LLVM IR from Mohamed-Ouarar/C_piscine :: C05/ex00 - ft_iterative_factorial (ft_iterative_factorial)

; 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 @ft_iterative_factorial(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 0
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %21

9:                                                ; preds = %1
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %13, %9
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = icmp sgt i32 %11, 0
  br i1 %12, label %13, label %19

13:                                               ; preds = %10
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = mul nsw i32 %14, %15
  store i32 %16, ptr %4, align 4, !tbaa !5
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = add nsw i32 %17, -1
  store i32 %18, ptr %3, align 4, !tbaa !5
  br label %10, !llvm.loop !9

19:                                               ; preds = %10
  %20 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %20, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %21

21:                                               ; preds = %19, %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %22 = load i32, ptr %2, align 4
  ret i32 %22
}

; 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/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: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local range(i32 0, -2147483648) i32 @ft_iterative_factorial(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 0
  br i1 %2, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1
  %.not = icmp eq i32 %0, 0
  br i1 %.not, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.preheader
  %min.iters.check = icmp ult i32 %0, 8
  br i1 %min.iters.check, label %.lr.ph, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i32 %0, 2147483640
  %ind.end = and i32 %0, 7
  %.splatinsert = insertelement <4 x i32> poison, i32 %0, i64 0
  %.splat = shufflevector <4 x i32> %.splatinsert, <4 x i32> poison, <4 x i32> zeroinitializer
  %induction = add nsw <4 x i32> %.splat, <i32 0, i32 -1, i32 -2, i32 -3>
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i32 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ <i32 1, i32 1, i32 1, i32 1>, %vector.ph ], [ %3, %vector.body ]
  %vec.phi12 = phi <4 x i32> [ <i32 1, i32 1, i32 1, i32 1>, %vector.ph ], [ %4, %vector.body ]
  %vec.ind = phi <4 x i32> [ %induction, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %step.add = add <4 x i32> %vec.ind, <i32 -4, i32 -4, i32 -4, i32 -4>
  %3 = mul <4 x i32> %vec.phi, %vec.ind
  %4 = mul <4 x i32> %vec.phi12, %step.add
  %index.next = add nuw i32 %index, 8
  %vec.ind.next = add <4 x i32> %vec.ind, <i32 -8, i32 -8, i32 -8, i32 -8>
  %5 = icmp eq i32 %index.next, %n.vec
  br i1 %5, label %middle.block, label %vector.body, !llvm.loop !5

middle.block:                                     ; preds = %vector.body
  %bin.rdx = mul <4 x i32> %4, %3
  %6 = tail call i32 @llvm.vector.reduce.mul.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i32 %n.vec, %0
  br i1 %cmp.n, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %middle.block
  %.011.ph = phi i32 [ 1, %.lr.ph.preheader ], [ %6, %middle.block ]
  %.0710.ph = phi i32 [ %0, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %7 = mul nuw nsw i32 %.011.ph, %.0710.ph
  %8 = icmp ugt i32 %.0710.ph, 1
  br i1 %8, label %.lr.ph.1, label %.loopexit, !llvm.loop !9

.lr.ph.1:                                         ; preds = %.lr.ph
  %9 = add nsw i32 %.0710.ph, -1
  %10 = mul nuw nsw i32 %7, %9
  %11 = icmp ugt i32 %9, 1
  br i1 %11, label %.lr.ph.2, label %.loopexit, !llvm.loop !9

.lr.ph.2:                                         ; preds = %.lr.ph.1
  %12 = add nsw i32 %.0710.ph, -2
  %13 = mul nuw nsw i32 %10, %12
  %14 = icmp ugt i32 %12, 1
  br i1 %14, label %.lr.ph.3, label %.loopexit, !llvm.loop !9

.lr.ph.3:                                         ; preds = %.lr.ph.2
  %15 = add nsw i32 %.0710.ph, -3
  %16 = mul nuw nsw i32 %13, %15
  %17 = icmp ugt i32 %15, 1
  br i1 %17, label %.lr.ph.4, label %.loopexit, !llvm.loop !9

.lr.ph.4:                                         ; preds = %.lr.ph.3
  %18 = add nsw i32 %.0710.ph, -4
  %19 = mul nuw nsw i32 %16, %18
  %20 = icmp ugt i32 %18, 1
  br i1 %20, label %.lr.ph.5, label %.loopexit, !llvm.loop !9

.lr.ph.5:                                         ; preds = %.lr.ph.4
  %21 = add nsw i32 %.0710.ph, -5
  %22 = mul nuw nsw i32 %19, %21
  %23 = icmp ugt i32 %21, 1
  br i1 %23, label %.lr.ph.6, label %.loopexit, !llvm.loop !9

.lr.ph.6:                                         ; preds = %.lr.ph.5
  %24 = add nsw i32 %.0710.ph, -6
  %25 = mul nuw nsw i32 %22, %24
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %.lr.ph.1, %.lr.ph.2, %.lr.ph.3, %.lr.ph.4, %.lr.ph.5, %.lr.ph.6, %middle.block, %.preheader, %1
  %.08 = phi i32 [ 0, %1 ], [ 1, %.preheader ], [ %6, %middle.block ], [ %7, %.lr.ph ], [ %10, %.lr.ph.1 ], [ %13, %.lr.ph.2 ], [ %16, %.lr.ph.3 ], [ %19, %.lr.ph.4 ], [ %22, %.lr.ph.5 ], [ %25, %.lr.ph.6 ]
  ret i32 %.08
}

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

attributes #0 = { nofree norecurse nosync nounwind 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" }
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 = distinct !{!5, !6, !7, !8}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!"llvm.loop.isvectorized", i32 1}
!8 = !{!"llvm.loop.unroll.runtime.disable"}
!9 = distinct !{!9, !6, !8, !7}


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