; LLVM IR from Robert-van-Engelen/lisp :: src (lisp-pr-single)

; 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"

@NIL = external dso_local global i32, align 4
@nil = external dso_local global float, align 4

; Function Attrs: nounwind uwtable
declare dso_local float @car(float noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local float @cdr(float noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @more(float noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local float @eval(float noundef, float noundef) #0

; Function Attrs: nounwind uwtable
define dso_local float @f_begin(float noundef %0, ptr noundef %1) #0 {
  %3 = alloca float, align 4
  %4 = alloca ptr, align 8
  store float %0, ptr %3, align 4, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  br label %5

5:                                                ; preds = %15, %2
  %6 = load float, ptr %3, align 4, !tbaa !5
  %7 = call i32 @more(float noundef %6)
  %8 = icmp ne i32 %7, 0
  br i1 %8, label %9, label %18

9:                                                ; preds = %5
  %10 = load float, ptr %3, align 4, !tbaa !5
  %11 = call float @car(float noundef %10)
  %12 = load ptr, ptr %4, align 8, !tbaa !9
  %13 = load float, ptr %12, align 4, !tbaa !5
  %14 = call float @eval(float noundef %11, float noundef %13)
  br label %15

15:                                               ; preds = %9
  %16 = load float, ptr %3, align 4, !tbaa !5
  %17 = call float @cdr(float noundef %16)
  store float %17, ptr %3, align 4, !tbaa !5
  br label %5, !llvm.loop !11

18:                                               ; preds = %5
  %19 = load i32, ptr %3, align 4, !tbaa !13
  %20 = lshr i32 %19, 20
  %21 = load i32, ptr @NIL, align 4, !tbaa !13
  %22 = icmp eq i32 %20, %21
  br i1 %22, label %23, label %25

23:                                               ; preds = %18
  %24 = load float, ptr @nil, align 4, !tbaa !5
  br label %28

25:                                               ; preds = %18
  %26 = load float, ptr %3, align 4, !tbaa !5
  %27 = call float @car(float noundef %26)
  br label %28

28:                                               ; preds = %25, %23
  %29 = phi float [ %24, %23 ], [ %27, %25 ]
  ret float %29
}

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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!14, !14, i64 0}
!14 = !{!"int", !7, i64 0}


; 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"

@NIL = external dso_local local_unnamed_addr global i32, align 4
@nil = external dso_local local_unnamed_addr global float, align 4

; Function Attrs: nounwind uwtable
declare dso_local float @car(float noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local float @cdr(float noundef) local_unnamed_addr #0

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

; Function Attrs: nounwind uwtable
declare dso_local float @eval(float noundef, float noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local float @f_begin(float noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = tail call i32 @more(float noundef %0)
  %.not5 = icmp eq i32 %3, 0
  br i1 %.not5, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.06 = phi float [ %7, %.lr.ph ], [ %0, %2 ]
  %4 = tail call float @car(float noundef %.06)
  %5 = load float, ptr %1, align 4, !tbaa !5
  %6 = tail call float @eval(float noundef %4, float noundef %5)
  %7 = tail call float @cdr(float noundef %.06)
  %8 = tail call i32 @more(float noundef %7)
  %.not = icmp eq i32 %8, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.0.lcssa = phi float [ %0, %2 ], [ %7, %.lr.ph ]
  %9 = bitcast float %.0.lcssa to i32
  %10 = lshr i32 %9, 20
  %11 = load i32, ptr @NIL, align 4, !tbaa !11
  %12 = icmp eq i32 %10, %11
  br i1 %12, label %13, label %15

13:                                               ; preds = %._crit_edge
  %14 = load float, ptr @nil, align 4, !tbaa !5
  br label %17

15:                                               ; preds = %._crit_edge
  %16 = tail call float @car(float noundef %.0.lcssa)
  br label %17

17:                                               ; preds = %15, %13
  %18 = phi float [ %14, %13 ], [ %16, %15 ]
  ret float %18
}

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


; Effective O3 passes: GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass