; LLVM IR from evanxg852000/rockstartdev :: mastering-ds-in-c/c-src/source (fact)

; 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 @fact(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = icmp slt i32 %4, 0
  br i1 %5, label %6, label %7

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

7:                                                ; preds = %1
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %10, label %11

10:                                               ; preds = %7
  store i32 1, ptr %2, align 4
  br label %21

11:                                               ; preds = %7
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = icmp eq i32 %12, 1
  br i1 %13, label %14, label %15

14:                                               ; preds = %11
  store i32 1, ptr %2, align 4
  br label %21

15:                                               ; preds = %11
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = sub nsw i32 %17, 1
  %19 = call i32 @fact(i32 noundef %18)
  %20 = mul nsw i32 %16, %19
  store i32 %20, ptr %2, align 4
  br label %21

21:                                               ; preds = %15, %14, %10, %6
  %22 = load i32, ptr %2, align 4
  ret i32 %22
}

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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; 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 @fact(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 0
  br i1 %2, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %switch12 = icmp ult i32 %0, 2
  br i1 %switch12, label %._crit_edge, label %tailrecurse.lr.ph

tailrecurse.lr.ph:                                ; preds = %.lr.ph.preheader
  %3 = add nsw i32 %0, -1
  %min.iters.check = icmp ult i32 %0, 9
  br i1 %min.iters.check, label %tailrecurse.preheader, label %vector.ph

vector.ph:                                        ; preds = %tailrecurse.lr.ph
  %n.vec = and i32 %3, -8
  %ind.end = sub i32 %0, %n.vec
  %.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 ], [ %4, %vector.body ]
  %vec.phi15 = phi <4 x i32> [ <i32 1, i32 1, i32 1, i32 1>, %vector.ph ], [ %5, %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>
  %4 = mul <4 x i32> %vec.ind, %vec.phi
  %5 = mul <4 x i32> %step.add, %vec.phi15
  %index.next = add nuw i32 %index, 8
  %vec.ind.next = add <4 x i32> %vec.ind, <i32 -8, i32 -8, i32 -8, i32 -8>
  %6 = icmp eq i32 %index.next, %n.vec
  br i1 %6, label %middle.block, label %vector.body, !llvm.loop !5

middle.block:                                     ; preds = %vector.body
  %bin.rdx = mul <4 x i32> %5, %4
  %7 = tail call i32 @llvm.vector.reduce.mul.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i32 %3, %n.vec
  br i1 %cmp.n, label %._crit_edge, label %tailrecurse.preheader

tailrecurse.preheader:                            ; preds = %middle.block, %tailrecurse.lr.ph
  %accumulator.tr714.ph = phi i32 [ 1, %tailrecurse.lr.ph ], [ %7, %middle.block ]
  %.tr813.ph = phi i32 [ %0, %tailrecurse.lr.ph ], [ %ind.end, %middle.block ]
  br label %tailrecurse

tailrecurse:                                      ; preds = %tailrecurse.preheader, %tailrecurse
  %accumulator.tr714 = phi i32 [ %9, %tailrecurse ], [ %accumulator.tr714.ph, %tailrecurse.preheader ]
  %.tr813 = phi i32 [ %8, %tailrecurse ], [ %.tr813.ph, %tailrecurse.preheader ]
  %8 = add nsw i32 %.tr813, -1
  %9 = mul nuw nsw i32 %.tr813, %accumulator.tr714
  %switch = icmp ult i32 %8, 2
  br i1 %switch, label %._crit_edge, label %tailrecurse, !llvm.loop !8

._crit_edge:                                      ; preds = %tailrecurse, %.lr.ph.preheader, %middle.block, %1
  %accumulator.ret.tr = phi i32 [ 0, %1 ], [ 1, %.lr.ph.preheader ], [ %7, %middle.block ], [ %9, %tailrecurse ]
  ret i32 %accumulator.ret.tr
}

; 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}
!6 = !{!"llvm.loop.isvectorized", i32 1}
!7 = !{!"llvm.loop.unroll.runtime.disable"}
!8 = distinct !{!8, !7, !6}


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