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GH-115802: Remove no-plt for Linux AArch64 #148238

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Merged
diegorusso merged 3 commits into from
Apr 8, 2026
+2 −1
Merged

GH-115802: Remove no-plt for Linux AArch64 #148238

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ba32120
GH-115802: Remove no-plt for Linux targets
diegorusso Mar 25, 2026
89e4994
📜🤖 Added by blurb_it.
blurb-it[bot] Apr 8, 2026
6714906
Revert changes for Linux x86-64
diegorusso Apr 8, 2026
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Revert changes for Linux x86-64
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@diegorusso
diegorusso committed Apr 8, 2026
commit 67149067417cac6d5b1ce00723180dead5af16c1
2 changes: 1 addition & 1 deletion Misc/NEWS.d/next/Core_and_Builtins/2026-04-08-06-59-23.gh-issue-115802.jqfZty.rst
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@@ -1 +1 @@
Improve JIT code generation on Linux targets by reducing the indirect call to external symbols. Patch by Diego Russo.
Improve JIT code generation on Linux AArch64 by reducing the indirect call to external symbols. Patch by Diego Russo.
15 changes: 4 additions & 11 deletions Python/jit.c
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Expand Up @@ -316,25 +316,18 @@ patch_32(unsigned char *location, uint64_t value)
memcpy(location, &final_value, sizeof(final_value));
}

// 32-bit absolute address, sign-extended by the instruction.
// 32-bit relative address.
void
patch_32s(unsigned char *location, uint64_t value)
patch_32r(unsigned char *location, uint64_t value)
{
value -= (uintptr_t)location;
// Check that we're not out of range of 32 signed bits:
assert((int64_t)value >= -(1LL << 31));
assert((int64_t)value < (1LL << 31));
int32_t final_value = (int32_t)value;
uint32_t final_value = (uint32_t)value;
memcpy(location, &final_value, sizeof(final_value));
}

// 32-bit relative address.
void
patch_32r(unsigned char *location, uint64_t value)
{
value -= (uintptr_t)location;
patch_32s(location, value);
}

// 64-bit absolute address.
void
patch_64(unsigned char *location, uint64_t value)
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1 change: 0 additions & 1 deletion Tools/jit/_stencils.py
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Expand Up @@ -90,7 +90,6 @@ class HoleValue(enum.Enum):
"R_AARCH64_MOVW_UABS_G2_NC": "patch_aarch64_16c",
"R_AARCH64_MOVW_UABS_G3": "patch_aarch64_16d",
# x86_64-unknown-linux-gnu:
"R_X86_64_32S": "patch_32s",
"R_X86_64_64": "patch_64",
"R_X86_64_GOTPCRELX": "patch_x86_64_32rx",
"R_X86_64_PLT32": "patch_32r",
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2 changes: 1 addition & 1 deletion Tools/jit/_targets.py
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Expand Up @@ -622,7 +622,7 @@ def get_target(host: str) -> _COFF32 | _COFF64 | _ELF | _MachO:
elif re.fullmatch(r"x86_64-.*-linux-gnu", host):
host = "x86_64-unknown-linux-gnu"
condition = "defined(__x86_64__) && defined(__linux__)"
args = ["-fno-pic", "-mcmodel=medium", "-mlarge-data-threshold=0"]
args = ["-fno-pic", "-mcmodel=medium", "-mlarge-data-threshold=0", "-fno-plt"]
optimizer = _optimizers.OptimizerX86
target = _ELF(
host, condition, args=args, optimizer=optimizer, frame_pointers=True
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