; 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"

@buf = external dso_local global [201 x i8], align 16
@nbuf = external dso_local global i32, align 4
@bufstart = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @trimbuf() #0 {
  store ptr @buf, ptr @bufstart, align 8, !tbaa !5
  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 @bufstart, 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 @bufstart, align 8, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %14, i32 1
  store ptr %15, ptr @bufstart, align 8, !tbaa !5
  br label %1, !llvm.loop !12

16:                                               ; preds = %1
  br label %17

17:                                               ; preds = %40, %16
  %18 = load i32, ptr @nbuf, align 4, !tbaa !14
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [201 x i8], ptr @buf, i64 0, i64 %19
  %21 = load ptr, ptr @bufstart, align 8, !tbaa !5
  %22 = icmp ugt ptr %20, %21
  br i1 %22, label %23, label %38

23:                                               ; preds = %17
  %24 = call ptr @__ctype_b_loc() #2
  %25 = load ptr, ptr %24, align 8, !tbaa !5
  %26 = load i32, ptr @nbuf, align 4, !tbaa !14
  %27 = sub nsw i32 %26, 1
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [201 x i8], ptr @buf, i64 0, i64 %28
  %30 = load i8, ptr %29, align 1, !tbaa !9
  %31 = sext i8 %30 to i32
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i16, ptr %25, i64 %32
  %34 = load i16, ptr %33, align 2, !tbaa !10
  %35 = zext i16 %34 to i32
  %36 = and i32 %35, 8192
  %37 = icmp ne i32 %36, 0
  br label %38

38:                                               ; preds = %23, %17
  %39 = phi i1 [ false, %17 ], [ %37, %23 ]
  br i1 %39, label %40, label %43

40:                                               ; preds = %38
  %41 = load i32, ptr @nbuf, align 4, !tbaa !14
  %42 = add nsw i32 %41, -1
  store i32 %42, ptr @nbuf, align 4, !tbaa !14
  br label %17, !llvm.loop !16

43:                                               ; preds = %38
  %44 = load i32, ptr @nbuf, align 4, !tbaa !14
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds [201 x i8], ptr @buf, i64 0, i64 %45
  store i8 0, ptr %46, align 1, !tbaa !9
  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"}
!14 = !{!15, !15, i64 0}
!15 = !{!"int", !7, i64 0}
!16 = distinct !{!16, !13}


; 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"

@buf = external dso_local global [201 x i8], align 16
@nbuf = external dso_local local_unnamed_addr global i32, align 4
@bufstart = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nofree nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @trimbuf() local_unnamed_addr #0 {
  %1 = tail call ptr @__ctype_b_loc() #2
  br label %2

2:                                                ; preds = %2, %0
  %storemerge = phi ptr [ @buf, %0 ], [ %9, %2 ]
  store ptr %storemerge, ptr @bufstart, align 8, !tbaa !5
  %3 = load ptr, ptr %1, align 8, !tbaa !5
  %4 = load i8, ptr %storemerge, align 1, !tbaa !9
  %5 = sext i8 %4 to i64
  %6 = getelementptr inbounds i16, ptr %3, i64 %5
  %7 = load i16, ptr %6, align 2, !tbaa !10
  %8 = and i16 %7, 8192
  %.not = icmp eq i16 %8, 0
  %9 = getelementptr inbounds i8, ptr %storemerge, i64 1
  br i1 %.not, label %.preheader, label %2, !llvm.loop !12

.preheader:                                       ; preds = %2
  %nbuf.promoted = load i32, ptr @nbuf, align 4, !tbaa !14
  %10 = sext i32 %nbuf.promoted to i64
  %11 = getelementptr inbounds [201 x i8], ptr @buf, i64 0, i64 %10
  %12 = icmp ugt ptr %11, %storemerge
  br i1 %12, label %.lr.ph.preheader, label %.critedge

.lr.ph.preheader:                                 ; preds = %.preheader
  %indvars.iv.next9 = add nsw i64 %10, -1
  %13 = getelementptr inbounds [201 x i8], ptr @buf, i64 0, i64 %indvars.iv.next9
  %14 = load i8, ptr %13, align 1, !tbaa !9
  %15 = sext i8 %14 to i64
  %16 = getelementptr inbounds i16, ptr %3, i64 %15
  %17 = load i16, ptr %16, align 2, !tbaa !10
  %18 = and i16 %17, 8192
  %.not110 = icmp eq i16 %18, 0
  br i1 %.not110, label %.critedge, label %.lr.ph12

.lr.ph:                                           ; preds = %.lr.ph12
  %indvars.iv.next = add nsw i64 %indvars.iv.next11, -1
  %19 = getelementptr inbounds [201 x i8], ptr @buf, i64 0, i64 %indvars.iv.next
  %20 = load i8, ptr %19, align 1, !tbaa !9
  %21 = sext i8 %20 to i64
  %22 = getelementptr inbounds i16, ptr %3, i64 %21
  %23 = load i16, ptr %22, align 2, !tbaa !10
  %24 = and i16 %23, 8192
  %.not1 = icmp eq i16 %24, 0
  br i1 %.not1, label %.critedge.loopexit, label %.lr.ph12, !llvm.loop !16

.lr.ph12:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %25 = phi ptr [ %19, %.lr.ph ], [ %13, %.lr.ph.preheader ]
  %indvars.iv.next11 = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.next9, %.lr.ph.preheader ]
  %26 = trunc nsw i64 %indvars.iv.next11 to i32
  %27 = icmp ugt ptr %25, %storemerge
  br i1 %27, label %.lr.ph, label %.critedge.loopexit, !llvm.loop !16

.critedge.loopexit:                               ; preds = %.lr.ph, %.lr.ph12
  store i32 %26, ptr @nbuf, align 4, !tbaa !14
  br label %.critedge

.critedge:                                        ; preds = %.critedge.loopexit, %.lr.ph.preheader, %.preheader
  %.lcssa = phi ptr [ %11, %.preheader ], [ %11, %.lr.ph.preheader ], [ %25, %.critedge.loopexit ]
  store i8 0, ptr %.lcssa, align 1, !tbaa !9
  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, 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"}
!14 = !{!15, !15, i64 0}
!15 = !{!"int", !7, i64 0}
!16 = distinct !{!16, !13}


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