https://github.com/python/cpython/commit/05e89c34bd8389f87bd6c9462d5a06ef9e1a65ab
commit: 05e89c34bd8389f87bd6c9462d5a06ef9e1a65ab
branch: main
author: Brandt Bucher <[email protected]>
committer: brandtbucher <[email protected]>
date: 2025-02-13T10:51:03-08:00
summary:
GH-115869: Don't JIT zeroed bytes (GH-130023)
files:
M Tools/jit/_writer.py
diff --git a/Tools/jit/_writer.py b/Tools/jit/_writer.py
index 5588784544ee00..090b52660f009c 100644
--- a/Tools/jit/_writer.py
+++ b/Tools/jit/_writer.py
@@ -49,15 +49,16 @@ def _dump_stencil(opname: str, group:
_stencils.StencilGroup) -> typing.Iterator
for part, stencil in [("code", group.code), ("data", group.data)]:
for line in stencil.disassembly:
yield f" // {line}"
- if stencil.body:
+ stripped = stencil.body.rstrip(b"\x00")
+ if stripped:
yield f" const unsigned char {part}_body[{len(stencil.body)}] =
{{"
- for i in range(0, len(stencil.body), 8):
- row = " ".join(f"{byte:#04x}," for byte in stencil.body[i : i
+ 8])
+ for i in range(0, len(stripped), 8):
+ row = " ".join(f"{byte:#04x}," for byte in stripped[i : i + 8])
yield f" {row}"
yield " };"
# Data is written first (so relaxations in the code work properly):
for part, stencil in [("data", group.data), ("code", group.code)]:
- if stencil.body:
+ if stencil.body.rstrip(b"\x00"):
yield f" memcpy({part}, {part}_body, sizeof({part}_body));"
skip = False
stencil.holes.sort(key=lambda hole: hole.offset)
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