; 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"

@lp = external dso_local global ptr, align 8

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

1:                                                ; preds = %13, %0
  %2 = call ptr @__ctype_b_loc() #2
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr @lp, align 8, !tbaa !5
  %5 = load i8, ptr %4, align 1, !tbaa !9
  %6 = sext i8 %5 to i32
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds i16, ptr %3, i64 %7
  %9 = load i16, ptr %8, align 2, !tbaa !10
  %10 = zext i16 %9 to i32
  %11 = and i32 %10, 8192
  %12 = icmp ne i32 %11, 0
  br i1 %12, label %13, label %16

13:                                               ; preds = %1
  %14 = load ptr, ptr @lp, align 8, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %14, i32 1
  store ptr %15, ptr @lp, align 8, !tbaa !5
  br label %1, !llvm.loop !12

16:                                               ; preds = %1
  ret void
}

; Function Attrs: nounwind willreturn memory(none)
declare ptr @__ctype_b_loc() #1

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 = { nounwind willreturn memory(none) "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 #2 = { nounwind willreturn memory(none) }

!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 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"short", !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"

@lp = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nofree nosync nounwind memory(readwrite, argmem: read, inaccessiblemem: none) uwtable
define dso_local void @skipwhite() local_unnamed_addr #0 {
  %1 = tail call ptr @__ctype_b_loc() #2
  %2 = load ptr, ptr %1, align 8, !tbaa !5
  %3 = load ptr, ptr @lp, align 8, !tbaa !5
  %4 = load i8, ptr %3, align 1, !tbaa !9
  %5 = sext i8 %4 to i64
  %6 = getelementptr inbounds i16, ptr %2, i64 %5
  %7 = load i16, ptr %6, align 2, !tbaa !10
  %8 = and i16 %7, 8192
  %.not1 = icmp eq i16 %8, 0
  br i1 %.not1, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %9 = phi ptr [ %10, %.lr.ph ], [ %3, %0 ]
  %10 = getelementptr inbounds i8, ptr %9, i64 1
  store ptr %10, ptr @lp, align 8, !tbaa !5
  %11 = load ptr, ptr %1, align 8, !tbaa !5
  %12 = load i8, ptr %10, align 1, !tbaa !9
  %13 = sext i8 %12 to i64
  %14 = getelementptr inbounds i16, ptr %11, i64 %13
  %15 = load i16, ptr %14, align 2, !tbaa !10
  %16 = and i16 %15, 8192
  %.not = icmp eq i16 %16, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

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

; Function Attrs: mustprogress nofree nosync nounwind willreturn memory(none)
declare ptr @__ctype_b_loc() local_unnamed_addr #1

attributes #0 = { nofree nosync nounwind memory(readwrite, argmem: read, inaccessiblemem: none) 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 = { mustprogress nofree nosync nounwind willreturn memory(none) "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 #2 = { nounwind willreturn memory(none) }

!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 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"short", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SimplifyCFGPass,TailCallElimPass