; LLVM IR from Robert-van-Engelen/tinylisp :: src (tinylisp-commented)

; 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

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

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

; Function Attrs: nounwind uwtable
declare dso_local i32 @not(double noundef) #0

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

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

5:                                                ; preds = %21, %2
  %6 = load i64, ptr %3, align 8, !tbaa !9
  %7 = lshr i64 %6, 48
  %8 = load i32, ptr @NIL, align 4, !tbaa !11
  %9 = zext i32 %8 to i64
  %10 = icmp ne i64 %7, %9
  br i1 %10, label %11, label %19

11:                                               ; preds = %5
  %12 = load double, ptr %3, align 8, !tbaa !5
  %13 = call double @car(double noundef %12)
  %14 = call double @car(double noundef %13)
  %15 = load double, ptr %4, align 8, !tbaa !5
  %16 = call double @eval(double noundef %14, double noundef %15)
  %17 = call i32 @not(double noundef %16)
  %18 = icmp ne i32 %17, 0
  br label %19

19:                                               ; preds = %11, %5
  %20 = phi i1 [ false, %5 ], [ %18, %11 ]
  br i1 %20, label %21, label %24

21:                                               ; preds = %19
  %22 = load double, ptr %3, align 8, !tbaa !5
  %23 = call double @cdr(double noundef %22)
  store double %23, ptr %3, align 8, !tbaa !5
  br label %5, !llvm.loop !13

24:                                               ; preds = %19
  %25 = load double, ptr %3, align 8, !tbaa !5
  %26 = call double @car(double noundef %25)
  %27 = call double @cdr(double noundef %26)
  %28 = call double @car(double noundef %27)
  %29 = load double, ptr %4, align 8, !tbaa !5
  %30 = call double @eval(double noundef %28, double noundef %29)
  ret double %30
}

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 = !{!"double", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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"

@NIL = external dso_local local_unnamed_addr global i32, align 4

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

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

; Function Attrs: nounwind uwtable
declare dso_local i32 @not(double noundef) local_unnamed_addr #0

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

; Function Attrs: nounwind uwtable
define dso_local double @f_cond(double noundef %0, double noundef %1) local_unnamed_addr #0 {
  %3 = bitcast double %0 to i64
  %4 = lshr i64 %3, 48
  %5 = load i32, ptr @NIL, align 4, !tbaa !5
  %6 = zext i32 %5 to i64
  %.not6 = icmp eq i64 %4, %6
  br i1 %.not6, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %11
  %.07 = phi double [ %12, %11 ], [ %0, %2 ]
  %7 = tail call double @car(double noundef %.07)
  %8 = tail call double @car(double noundef %7)
  %9 = tail call double @eval(double noundef %8, double noundef %1)
  %10 = tail call i32 @not(double noundef %9)
  %.not5 = icmp eq i32 %10, 0
  br i1 %.not5, label %.critedge, label %11

11:                                               ; preds = %.lr.ph
  %12 = tail call double @cdr(double noundef %.07)
  %13 = bitcast double %12 to i64
  %14 = lshr i64 %13, 48
  %15 = load i32, ptr @NIL, align 4, !tbaa !5
  %16 = zext i32 %15 to i64
  %.not = icmp eq i64 %14, %16
  br i1 %.not, label %.critedge, label %.lr.ph, !llvm.loop !9

.critedge:                                        ; preds = %.lr.ph, %11, %2
  %.0.lcssa = phi double [ %0, %2 ], [ %12, %11 ], [ %.07, %.lr.ph ]
  %17 = tail call double @car(double noundef %.0.lcssa)
  %18 = tail call double @cdr(double noundef %17)
  %19 = tail call double @car(double noundef %18)
  %20 = tail call double @eval(double noundef %19, double noundef %1)
  ret double %20
}

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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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