gh-119726: emit AArch64 trampolines in the data section #121280
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Emit AArch64 trampolines in the data section (instead of the code) of the stencil. In many cases this allows the branch to the next micro-op at the end of the stencil to be replaced with a fall-through NOP.
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@brandtbucher I have provided a news entry but I feel we can skip it for the PR. Let me know what you think. |
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Jul 3, 2024
Misc/NEWS.d/next/Core and Builtins/2024-06-28-18-34-49.gh-issue-119726.Fjv_Ab.rst
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| where = slice(hole.offset, hole.offset + 4) | ||
| instruction = int.from_bytes(self.body[where], sys.byteorder) | ||
| instruction &= 0xFC000000 | ||
| instruction |= ((base - hole.offset) >> 2) & 0x03FFFFFF | ||
| self.body[where] = instruction.to_bytes(4, sys.byteorder) | ||
| new_hole = hole.replace(addend=base, symbol=None, value=HoleValue.DATA) |
…e-119726.Fjv_Ab.rst Co-authored-by: Brandt Bucher <brandtbucher@gmail.com>
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Emit AArch64 trampolines in the data section (instead of the code) of the stencil. In many cases this allows the branch to the next micro-op at the end of the stencil to be replaced with a fall-through NOP.