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GH-135904: Implement assembler optimization for AArch64. (GH-139855)

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Mark Shannon 2025-10-17 11:26:17 +01:00 • committed by GitHub
parent 999ab8926b
commit f1883852ed
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5 changed files with 74 additions and 9 deletions
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47
Tools/jit/_optimizers.py
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@ -39,6 +39,34 @@
# Update with all of the inverted branches, too:
_X86_BRANCHES |= {v: k for k, v in _X86_BRANCHES.items() if v}
_AARCH64_COND_CODES = {
# https://developer.arm.com/documentation/dui0801/b/CJAJIHAD?lang=en
"eq": "ne",
"ne": "eq",
"lt": "ge",
"ge": "lt",
"gt": "le",
"le": "gt",
"vs": "vc",
"vc": "vs",
"mi": "pl",
"pl": "mi",
"cs": "cc",
"cc": "cs",
"hs": "lo",
"lo": "hs",
"hi": "ls",
"ls": "hi",
}
# Branches are either b.{cond} or bc.{cond}
_AARCH64_BRANCHES = {
"b." + cond: ("b." + inverse if inverse else None)
for (cond, inverse) in _AARCH64_COND_CODES.items()
} | {
"bc." + cond: ("bc." + inverse if inverse else None)
for (cond, inverse) in _AARCH64_COND_CODES.items()
}
@dataclasses.dataclass
class _Block:
@ -283,13 +311,28 @@ def run(self) -> None:
self.path.write_text(self._body())
class OptimizerAArch64(Optimizer): # pylint: disable = too-few-public-methods
"""aarch64-apple-darwin/aarch64-pc-windows-msvc/aarch64-unknown-linux-gnu"""
# Mach-O does not support the 19 bit branch locations needed for branch reordering
class OptimizerAArch64_MachO(Optimizer): # pylint: disable = too-few-public-methods
"""aarch64-apple-darwin"""
# https://developer.arm.com/documentation/ddi0602/2025-03/Base-Instructions/B--Branch-
_re_jump = re.compile(r"\s*b\s+(?P<target>[\w.]+)")
class OptimizerAArch64(Optimizer): # pylint: disable = too-few-public-methods
"""aarch64-pc-windows-msvc/aarch64-unknown-linux-gnu"""
_branches = _AARCH64_BRANCHES
_re_branch = re.compile(
rf"\s*(?P<instruction>{'|'.join(_AARCH64_BRANCHES)})\s+(.+,\s+)*(?P<target>[\w.]+)"
)
# https://developer.arm.com/documentation/ddi0602/2025-03/Base-Instructions/B--Branch-
_re_jump = re.compile(r"\s*b\s+(?P<target>[\w.]+)")
# https://developer.arm.com/documentation/ddi0602/2025-09/Base-Instructions/RET--Return-from-subroutine-
_re_return = re.compile(r"\s*ret\b")
class OptimizerX86(Optimizer): # pylint: disable = too-few-public-methods
"""i686-pc-windows-msvc/x86_64-apple-darwin/x86_64-unknown-linux-gnu"""