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

; 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"

@peekc = external dso_local global i32, align 4

; Function Attrs: nounwind uwtable
declare dso_local i32 @ch() #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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

; Function Attrs: nounwind uwtable
define dso_local i64 @num() #0 {
  %1 = alloca i64, align 8
  %2 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #2
  store i64 0, ptr %1, align 8, !tbaa !5
  br label %3

3:                                                ; preds = %13, %0
  %4 = call i32 @ch()
  store i32 %4, ptr %2, align 4, !tbaa !9
  %5 = load i32, ptr %2, align 4, !tbaa !9
  %6 = icmp ne i32 %5, -1
  br i1 %6, label %7, label %20

7:                                                ; preds = %3
  %8 = load i32, ptr %2, align 4, !tbaa !9
  %9 = call i32 @isoct(i32 noundef %8)
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %13, label %11

11:                                               ; preds = %7
  %12 = load i32, ptr %2, align 4, !tbaa !9
  store i32 %12, ptr @peekc, align 4, !tbaa !9
  br label %20

13:                                               ; preds = %7
  %14 = load i64, ptr %1, align 8, !tbaa !5
  %15 = shl i64 %14, 3
  %16 = load i32, ptr %2, align 4, !tbaa !9
  %17 = sub nsw i32 %16, 48
  %18 = sext i32 %17 to i64
  %19 = or i64 %15, %18
  store i64 %19, ptr %1, align 8, !tbaa !5
  br label %3, !llvm.loop !11

20:                                               ; preds = %11, %3
  %21 = load i64, ptr %1, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #2
  ret i64 %21
}

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind }

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

@peekc = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: nounwind uwtable
declare dso_local i32 @ch() local_unnamed_addr #0

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

; Function Attrs: nounwind uwtable
define dso_local i64 @num() local_unnamed_addr #0 {
  %1 = tail call i32 @ch()
  %.not11 = icmp eq i32 %1, -1
  br i1 %.not11, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %0, %5
  %2 = phi i32 [ %10, %5 ], [ %1, %0 ]
  %.012 = phi i64 [ %9, %5 ], [ 0, %0 ]
  %3 = tail call i32 @isoct(i32 noundef %2)
  %.not7 = icmp eq i32 %3, 0
  br i1 %.not7, label %4, label %5

4:                                                ; preds = %.lr.ph
  store i32 %2, ptr @peekc, align 4, !tbaa !5
  br label %.loopexit

5:                                                ; preds = %.lr.ph
  %6 = shl i64 %.012, 3
  %7 = add nsw i32 %2, -48
  %8 = sext i32 %7 to i64
  %9 = or i64 %6, %8
  %10 = tail call i32 @ch()
  %.not = icmp eq i32 %10, -1
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !9

.loopexit:                                        ; preds = %5, %0, %4
  %.010 = phi i64 [ %.012, %4 ], [ 0, %0 ], [ %9, %5 ]
  ret i64 %.010
}

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: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass