; LLVM IR from aap/pdp6 :: tools (as6)

; 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"

%struct.Token = type { i32, %union.anon.0 }
%union.anon.0 = type { i64 }

@lp = external dso_local global ptr, align 8
@peekt = external dso_local global %struct.Token, align 8

; Function Attrs: nounwind uwtable
declare dso_local ptr @getln() #0

; Function Attrs: nounwind uwtable
declare dso_local void @statement() #0

; Function Attrs: nounwind uwtable
define dso_local void @assemble() #0 {
  br label %1

1:                                                ; preds = %4, %0
  %2 = call ptr @getln()
  store ptr %2, ptr @lp, align 8, !tbaa !5
  %3 = icmp ne ptr %2, null
  br i1 %3, label %4, label %5

4:                                                ; preds = %1
  store i32 0, ptr @peekt, align 8, !tbaa !9
  call void @statement()
  br label %1, !llvm.loop !12

5:                                                ; preds = %1
  ret void
}

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

%struct.Token = type { i32, %union.anon.0 }
%union.anon.0 = type { i64 }

@lp = external dso_local local_unnamed_addr global ptr, align 8
@peekt = external dso_local local_unnamed_addr global %struct.Token, align 8

; Function Attrs: nounwind uwtable
declare dso_local ptr @getln() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @statement() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @assemble() local_unnamed_addr #0 {
  %1 = tail call ptr @getln()
  store ptr %1, ptr @lp, align 8, !tbaa !5
  %.not1 = icmp eq ptr %1, null
  br i1 %.not1, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  store i32 0, ptr @peekt, align 8, !tbaa !9
  tail call void @statement()
  %2 = tail call ptr @getln()
  store ptr %2, ptr @lp, align 8, !tbaa !5
  %.not = icmp eq ptr %2, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph, %0
  ret void
}

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


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