[Target] Add Target Parser for Arm(R) Cortex(R) A-Profile CPUs

[Mousius]

This implements an initial Target Parser which aims to consolidate architecture feature detection from a few different places:

• tvm/python/tvm/topi/arm_cpu/arm_utils.py

  Lines 24 to 70 in d2db9cb

  	def get_arch_version(target_mattr):
  	"""Parse the LLVM target -mattr, and return
  	the architecture version in a decimal representation
  	(e.g., if -mattr=v8.4a, return 8.4)
  	"""
  	arch_version = 8.0
  	m = re.compile(r"\+v(.*)\.(.*)a")
  	for attr in target_mattr:
  	match_obj = m.match(attr)
  	if match_obj:
  	major = int(match_obj.group(1))
  	minor = int(match_obj.group(2))
  	decimal = 10
  	if minor >= 10:
  	decimal = 100
  	arch_version = major + float(minor) / decimal
  	return arch_version
  	def is_dotprod_available():
  	"""Checks whether the hardware has support for udot/sdot instructions."""
  	target = tvm.target.Target.current(allow_none=False)
  	arch_version = get_arch_version(target.mattr)
  	return arch_version >= 8.4 or ((arch_version in (8.2, 8.3)) and "+dotprod" in target.mattr)
  	def is_mmla_available():
  	"""Checks whether the hardware has support for ummla/smmla instructions."""
  	target = tvm.target.Target.current(allow_none=False)
  	arch_version = get_arch_version(target.mattr)
  	return arch_version >= 8.6 or (
  	(arch_version in (8.2, 8.3, 8.4, 8.5)) and "+i8mm" in target.mattr
  	)
  	def is_aarch64_arm():
  	"""Checks whether we are compiling for an AArch64 target."""
  	target = tvm.target.Target.current(allow_none=False)
  	return "aarch64" in target.attrs.get("mtriple", "")
  	def is_neon_available():
  	"""Check if neon instructions are available"""
  	target = tvm.target.Target.current(allow_none=False)
  	return "+neon" in target.mattr

• tvm/python/tvm/relay/qnn/op/legalizations.py

  Lines 350 to 359 in 02fbaf0

  	def is_fast_int8_on_arm():
  	"""Checks whether the hardware has support for fast Int8 arithmetic operations."""
  	target = tvm.target.Target.current(allow_none=False)
  	return "+v8.2a" in target.mattr and "+dotprod" in target.mattr
  	def is_aarch64_arm():
  	"""Checks whether we are compiling for an AArch64 target."""
  	target = tvm.target.Target.current(allow_none=False)
  	return "aarch64" in target.attrs.get("mtriple", "")

• tvm/python/tvm/relay/op/strategy/arm_cpu.py

  Line 232 in b542724

  if is_aarch64 or "+neon" in target.mattr:

A further patch will remove all of the above and replace usages with the .features map.

[Mousius]

cc @u99127 for review 😸

[github-actions]

It has been a while since this PR was updated, @u99127 please leave a review or address the outstanding comments. @Mousius if this PR is still a work in progress, please convert it to a draft until it is ready for review.

[github-actions]

It has been a while since this PR was updated, @u99127 please leave a review or address the outstanding comments. @Mousius if this PR is still a work in progress, please convert it to a draft until it is ready for review.

[github-actions]

It has been a while since this PR was updated, @u99127 please leave a review or address the outstanding comments. @Mousius if this PR is still a work in progress, please convert it to a draft until it is ready for review.

[github-actions]

It has been a while since this PR was updated, @u99127 please leave a review or address the outstanding comments. @Mousius if this PR is still a work in progress, please convert it to a draft until it is ready for review.

[u99127]

Sorry about the time it has taken to get around to this :)

If I could request a few changes , then I'm good .

[tvm-bot]

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[u99127]

LGTM. Just watch out what you'd like in the commit message given the tree of commits here - I'm sure you already know this :)

[lhutton1]

LGTM!