; 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"

@CONS = external dso_local global i32, align 4
@err = external dso_local global double, align 8

; Function Attrs: nounwind uwtable
declare dso_local i32 @equ(double noundef, double noundef) #0

; 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
define dso_local double @assoc(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 %4, align 8, !tbaa !9
  %7 = lshr i64 %6, 48
  %8 = load i32, ptr @CONS, align 4, !tbaa !11
  %9 = zext i32 %8 to i64
  %10 = icmp eq i64 %7, %9
  br i1 %10, label %11, label %19

11:                                               ; preds = %5
  %12 = load double, ptr %3, align 8, !tbaa !5
  %13 = load double, ptr %4, align 8, !tbaa !5
  %14 = call double @car(double noundef %13)
  %15 = call double @car(double noundef %14)
  %16 = call i32 @equ(double noundef %12, double noundef %15)
  %17 = icmp ne i32 %16, 0
  %18 = xor i1 %17, true
  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 %4, align 8, !tbaa !5
  %23 = call double @cdr(double noundef %22)
  store double %23, ptr %4, align 8, !tbaa !5
  br label %5, !llvm.loop !13

24:                                               ; preds = %19
  %25 = load i64, ptr %4, align 8, !tbaa !9
  %26 = lshr i64 %25, 48
  %27 = load i32, ptr @CONS, align 4, !tbaa !11
  %28 = zext i32 %27 to i64
  %29 = icmp eq i64 %26, %28
  br i1 %29, label %30, label %34

30:                                               ; preds = %24
  %31 = load double, ptr %4, align 8, !tbaa !5
  %32 = call double @car(double noundef %31)
  %33 = call double @cdr(double noundef %32)
  br label %36

34:                                               ; preds = %24
  %35 = load double, ptr @err, align 8, !tbaa !5
  br label %36

36:                                               ; preds = %34, %30
  %37 = phi double [ %33, %30 ], [ %35, %34 ]
  ret double %37
}

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"

@CONS = external dso_local local_unnamed_addr global i32, align 4
@err = external dso_local local_unnamed_addr global double, align 8

; Function Attrs: nounwind uwtable
declare dso_local i32 @equ(double noundef, double noundef) local_unnamed_addr #0

; 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
define dso_local double @assoc(double noundef %0, double noundef %1) local_unnamed_addr #0 {
  %3 = bitcast double %1 to i64
  %4 = lshr i64 %3, 48
  %5 = load i32, ptr @CONS, align 4, !tbaa !5
  %6 = zext i32 %5 to i64
  %7 = icmp eq i64 %4, %6
  br i1 %7, label %.lr.ph.preheader, label %.critedge

.lr.ph.preheader:                                 ; preds = %2
  %8 = tail call double @car(double noundef %1)
  %9 = tail call double @car(double noundef %8)
  %10 = tail call i32 @equ(double noundef %0, double noundef %9)
  %.not25 = icmp eq i32 %10, 0
  br i1 %.not25, label %.lr.ph27, label %.lr.ph..critedge.loopexit_crit_edge

.lr.ph:                                           ; preds = %.lr.ph27
  %11 = tail call double @car(double noundef %14)
  %12 = tail call double @car(double noundef %11)
  %13 = tail call i32 @equ(double noundef %0, double noundef %12)
  %.not = icmp eq i32 %13, 0
  br i1 %.not, label %.lr.ph27, label %.lr.ph..critedge.loopexit_crit_edge, !llvm.loop !9

.lr.ph..critedge.loopexit_crit_edge:              ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa20 = phi i64 [ %4, %.lr.ph.preheader ], [ %16, %.lr.ph ]
  %.05.lcssa = phi double [ %1, %.lr.ph.preheader ], [ %14, %.lr.ph ]
  %.pre.pre = load i32, ptr @CONS, align 4, !tbaa !5
  %.pre12 = zext i32 %.pre.pre to i64
  br label %.critedge

.lr.ph27:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %.0526 = phi double [ %14, %.lr.ph ], [ %1, %.lr.ph.preheader ]
  %14 = tail call double @cdr(double noundef %.0526)
  %15 = bitcast double %14 to i64
  %16 = lshr i64 %15, 48
  %17 = load i32, ptr @CONS, align 4, !tbaa !5
  %18 = zext i32 %17 to i64
  %19 = icmp eq i64 %16, %18
  br i1 %19, label %.lr.ph, label %.critedge, !llvm.loop !9

.critedge:                                        ; preds = %.lr.ph27, %.lr.ph..critedge.loopexit_crit_edge, %2
  %.pre-phi = phi i64 [ %6, %2 ], [ %.pre12, %.lr.ph..critedge.loopexit_crit_edge ], [ %18, %.lr.ph27 ]
  %.0.lcssa = phi double [ %1, %2 ], [ %.05.lcssa, %.lr.ph..critedge.loopexit_crit_edge ], [ %14, %.lr.ph27 ]
  %.lcssa = phi i64 [ %4, %2 ], [ %.lcssa20, %.lr.ph..critedge.loopexit_crit_edge ], [ %16, %.lr.ph27 ]
  %20 = icmp eq i64 %.lcssa, %.pre-phi
  br i1 %20, label %21, label %24

21:                                               ; preds = %.critedge
  %22 = tail call double @car(double noundef %.0.lcssa)
  %23 = tail call double @cdr(double noundef %22)
  br label %26

24:                                               ; preds = %.critedge
  %25 = load double, ptr @err, align 8, !tbaa !11
  br label %26

26:                                               ; preds = %24, %21
  %27 = phi double [ %23, %21 ], [ %25, %24 ]
  ret double %27
}

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"}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !7, i64 0}


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