; LLVM IR from aap/pdp6 :: fe6 (fe)

; 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.Assembler = type { [4 x i64], i32, i64, i32, i32 }

@as = external dso_local global %struct.Assembler, align 8
@astack = external dso_local global [8 x %struct.Assembler], align 16
@asp = external dso_local global i32, align 4
@.str.30 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #0

; Function Attrs: nounwind uwtable
declare dso_local void @err(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @popexp() #1 {
  %1 = load i32, ptr @asp, align 4, !tbaa !5
  %2 = icmp slt i32 %1, 0
  br i1 %2, label %3, label %4

3:                                                ; preds = %0
  call void @err(ptr noundef @.str.30)
  br label %4

4:                                                ; preds = %3, %0
  %5 = load i32, ptr @asp, align 4, !tbaa !5
  %6 = add nsw i32 %5, -1
  store i32 %6, ptr @asp, align 4, !tbaa !5
  %7 = load i32, ptr @asp, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [8 x %struct.Assembler], ptr @astack, i64 0, i64 %8
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 @as, ptr align 8 %9, i64 56, i1 false), !tbaa.struct !9
  ret void
}

attributes #0 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = !{i64 0, i64 32, !10, i64 32, i64 4, !5, i64 40, i64 8, !11, i64 48, i64 4, !5, i64 52, i64 4, !5}
!10 = !{!7, !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !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"

%struct.Assembler = type { [4 x i64], i32, i64, i32, i32 }

@as = external dso_local local_unnamed_addr global %struct.Assembler, align 8
@astack = external dso_local local_unnamed_addr global [8 x %struct.Assembler], align 16
@asp = external dso_local local_unnamed_addr global i32, align 4
@.str.30 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #0

; Function Attrs: nounwind uwtable
declare dso_local void @err(ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @popexp() local_unnamed_addr #1 {
  %1 = load i32, ptr @asp, align 4, !tbaa !5
  %2 = icmp slt i32 %1, 0
  br i1 %2, label %3, label %4

3:                                                ; preds = %0
  tail call void @err(ptr noundef nonnull @.str.30)
  %.pre = load i32, ptr @asp, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %3, %0
  %5 = phi i32 [ %.pre, %3 ], [ %1, %0 ]
  %6 = add nsw i32 %5, -1
  store i32 %6, ptr @asp, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [8 x %struct.Assembler], ptr @astack, i64 0, i64 %7
  tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(56) @as, ptr noundef nonnull align 8 dereferenceable(56) %8, i64 56, i1 false), !tbaa.struct !9
  ret void
}

attributes #0 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = !{i64 0, i64 32, !10, i64 32, i64 4, !5, i64 40, i64 8, !11, i64 48, i64 4, !5, i64 52, i64 4, !5}
!10 = !{!7, !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,TailCallElimPass