diff --git a/clang/utils/convert_arm_neon.py b/clang/utils/convert_arm_neon.py
deleted file mode 100644
index c4b364529457..000000000000
--- a/clang/utils/convert_arm_neon.py
+++ /dev/null
@@ -1,172 +0,0 @@
-#!/usr/bin/env python3
-
-# This script was committed on 20/11/2019 and it would probably make sense to remove
-# it after the next release branches.
-
-# This script is pipe based and converts an arm_neon.td (or arm_fp16.td) file
-# using the old single-char type modifiers to an equivalent new-style form where
-# each modifier is orthogonal and they can be composed.
-#
-# It was used to directly generate the .td files on master, so if you have any
-# local additions I would suggest implementing any modifiers here, and running
-# it over your entire pre-merge .td files rather than trying to resolve any
-# conflicts manually.
-
-import re, sys
-MOD_MAP = {
-    'v': 'v',
-    'x': 'S',
-    'u': 'U',
-    'd': '.',
-    'g': 'q',
-    'j': 'Q',
-    'w': '>Q',
-    'n': '>',
-    'h': '<',
-    'q': '<Q',
-    'e': '<U',
-    'm': '<q',
-    'i': 'I',
-    'l': 'IU>',
-    's': '1',
-    'z': '1<',
-    'r': '1>',
-    'b': '1U',
-    '$': '1S',
-    'k': 'Q',
-    '2': '2',
-    '3': '3',
-    '4': '4',
-    'B': '2Q',
-    'C': '3Q',
-    'D': '4Q',
-    'p': '*',
-    'c': 'c*',
-    '7': '<<q',
-    '8': '<<',
-    '9': '<<Q',
-    't': 'p'
-    }
-
-
-def typespec_elt_size(typespec):
-    if 'c' in typespec:
-        return 8
-    elif 's' in typespec or 'h' in typespec:
-        return 16
-    elif 'i' in typespec or 'f' in typespec:
-        return 32
-    elif 'l' in typespec or 'd' in typespec:
-        return 64
-    elif 'k' in typespec:
-        return 128
-
-def get_resize(cur, desired):
-    res = ''
-    while cur < desired:
-        res += '>'
-        cur *= 2
-    while cur > desired:
-        res += '<'
-        cur /= 2
-    return res
-
-
-def remap_protocol(proto, typespec, name):
-    key_type = 0
-
-    # Conversions like to see the integer type so they know signedness.
-    if 'vcvt' in name and '_f' in name and name != 'vcvt_f32_f64' and name != 'vcvt_f64_f32':
-        key_type = 1
-    default_width = typespec_elt_size(typespec)
-    inconsistent_width = False
-    for elt in typespec:
-        new_width = typespec_elt_size(elt)
-        if new_width and new_width != default_width:
-            inconsistent_width = True
-
-    res = ''
-    for i, c in enumerate(proto):
-        # void and pointers make for bad discriminators in CGBuiltin.cpp.
-        if c in 'vcp':
-                key_type += 1
-
-        if c in MOD_MAP:
-            cur_mod = MOD_MAP[c]
-        elif inconsistent_width:
-            # Otherwise it's a fixed output width modifier.
-            sys.stderr.write(f'warning: {name} uses fixed output size but has inconsistent input widths: {proto} {typespec}\n')
-
-        if c == 'Y':
-            # y: scalar of half float
-            resize = get_resize(default_width, 16)
-            cur_mod = f'1F{resize}'
-        elif c == 'y':
-            # y: scalar of float
-            resize = get_resize(default_width, 32)
-            cur_mod = f'1F{resize}'
-        elif c == 'o':
-            # o: scalar of double
-            resize = get_resize(default_width, 64)
-            cur_mod = f'1F{resize}'
-        elif c == 'I':
-            # I: scalar of 32-bit signed
-            resize = get_resize(default_width, 32)
-            cur_mod = f'1S{resize}'
-        elif c == 'L':
-            # L: scalar of 64-bit signed
-            resize = get_resize(default_width, 64)
-            cur_mod = f'1S{resize}'
-        elif c == 'U':
-            # I: scalar of 32-bit unsigned
-            resize = get_resize(default_width, 32)
-            cur_mod = f'1U{resize}'
-        elif c == 'O':
-            # O: scalar of 64-bit unsigned
-            resize = get_resize(default_width, 64)
-            cur_mod = f'1U{resize}'
-        elif c == 'f':
-            # f: float (int args)
-            resize = get_resize(default_width, 32)
-            cur_mod = f'F{resize}'
-        elif c == 'F':
-            # F: double (int args)
-            resize = get_resize(default_width, 64)
-            cur_mod = f'F{resize}'
-        elif c == 'H':
-            # H: half (int args)
-            resize = get_resize(default_width, 16)
-            cur_mod = f'F{resize}'
-        elif c == '0':
-            # 0: half (int args), ignore 'Q' size modifier.
-            resize = get_resize(default_width, 16)
-            cur_mod = f'Fq{resize}'
-        elif c == '1':
-            # 1: half (int args), force 'Q' size modifier.
-            resize = get_resize(default_width, 16)
-            cur_mod = f'FQ{resize}'
-
-        if len(cur_mod) == 0:
-            raise Exception(f'WTF: {c} in {name}')
-
-        if key_type != 0 and key_type == i:
-            cur_mod += '!'
-
-        if len(cur_mod) == 1:
-            res += cur_mod
-        else:
-            res += '(' + cur_mod + ')'
-
-    return res
-
-def replace_insts(m):
-    start, end = m.span('proto')
-    start -= m.start()
-    end -= m.start()
-    new_proto = remap_protocol(m['proto'], m['kinds'], m['name'])
-    return m.group()[:start] + new_proto + m.group()[end:]
-
-INST = re.compile(r'Inst<"(?P<name>.*?)",\s*"(?P<proto>.*?)",\s*"(?P<kinds>.*?)"')
-
-new_td = INST.sub(replace_insts, sys.stdin.read())
-sys.stdout.write(new_td)