https://github.com/python/cpython/commit/8a33034d82314e2a5a8f39f9348e93135f94807d
commit: 8a33034d82314e2a5a8f39f9348e93135f94807d
branch: main
author: Diego Russo <diego.ru...@arm.com>
committer: brandtbucher <brandtbuc...@gmail.com>
date: 2025-03-19T12:19:21-07:00
summary:
GH-130956: Only emit AArch64 trampolines for long jumps (GH-131041)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-03-10-12-05-45.gh-issue-130956.f823Ih.rst
M Python/jit.c
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2025-03-10-12-05-45.gh-issue-130956.f823Ih.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2025-03-10-12-05-45.gh-issue-130956.f823Ih.rst
new file mode 100644
index 00000000000000..daf9c8ea09f081
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2025-03-10-12-05-45.gh-issue-130956.f823Ih.rst
@@ -0,0 +1 @@
+Optimize the AArch64 code generation for the JIT. Patch by Diego Russo
diff --git a/Python/jit.c b/Python/jit.c
index 092b873bc734e1..95b5a1b52b8b65 100644
--- a/Python/jit.c
+++ b/Python/jit.c
@@ -430,6 +430,17 @@ void patch_aarch64_trampoline(unsigned char *location, int
ordinal, jit_state *s
void
patch_aarch64_trampoline(unsigned char *location, int ordinal, jit_state
*state)
{
+
+ uint64_t value = (uintptr_t)symbols_map[ordinal];
+ int64_t range = value - (uintptr_t)location;
+
+ // If we are in range of 28 signed bits, we patch the instruction with
+ // the address of the symbol.
+ if (range >= -(1 << 27) && range < (1 << 27)) {
+ patch_aarch64_26r(location, (uintptr_t)value);
+ return;
+ }
+
// Masking is done modulo 32 as the mask is stored as an array of uint32_t
const uint32_t symbol_mask = 1 << (ordinal % 32);
const uint32_t trampoline_mask = state->trampolines.mask[ordinal / 32];
@@ -445,7 +456,6 @@ patch_aarch64_trampoline(unsigned char *location, int
ordinal, jit_state *state)
uint32_t *p = (uint32_t*)(state->trampolines.mem + index *
TRAMPOLINE_SIZE);
assert((size_t)(index + 1) * TRAMPOLINE_SIZE <= state->trampolines.size);
- uint64_t value = (uintptr_t)symbols_map[ordinal];
/* Generate the trampoline
0: 58000048 ldr x8, 8
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