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Fixed cacheline size check.

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This commit is contained in:
Jari Sundell
2026-06-01 13:11:02 +02:00
committed by GitHub
parent 2cf8f2351b
commit 50a609ade9
10 changed files with 196 additions and 29 deletions
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scripts/common.m4
+64 -15
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@@ -159,23 +159,72 @@ AC_DEFUN([TORRENT_CHECK_POPCOUNT], [
])
AC_DEFUN([TORRENT_CHECK_CACHELINE], [
AC_MSG_CHECKING(for cacheline)
AC_REQUIRE([AC_CANONICAL_HOST])
AC_MSG_CHECKING([for target cacheline size])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#include <stdlib.h>
#include <linux/cache.h>
void* vptr __cacheline_aligned;
void f() { posix_memalign(&vptr, SMP_CACHE_BYTES, 42); }
])],
[
AC_MSG_RESULT(found builtin)
dnl Need to fix this so that it uses the stuff defined by the system.
case "$host_os" in
linux*)
# REGION: Linux Kernel Extraction Loop
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include <stdlib.h>
#include <linux/cache.h>
void* vptr;
void f() {
int res = posix_memalign(&vptr, SMP_CACHE_BYTES, 42);
(void)res;
}
]])],[
# We need an explicit variable fallback condition inside AC_COMPUTE_INT
AC_COMPUTE_INT([torrent_cv_cacheline_size], [SMP_CACHE_BYTES], [#include <linux/cache.h>], [torrent_cv_cacheline_size=0])
AC_DEFINE(LT_SMP_CACHE_BYTES, 128, Largest L1 cache size we know of should work on all archs.)
], [
AC_MSG_RESULT(using default 128 bytes)
AC_DEFINE(LT_SMP_CACHE_BYTES, 128, Largest L1 cache size we know of should work on all archs.)
])
if test "$torrent_cv_cacheline_size" -gt 0; then
AC_MSG_RESULT([linux builtin ($torrent_cv_cacheline_size bytes)])
AC_DEFINE_UNQUOTED([LT_SMP_CACHE_BYTES], [$torrent_cv_cacheline_size], [System-defined Linux L1 SMP cacheline size.])
else
# Handle scenarios where macro maps to a complex runtime expression or fails
AC_MSG_RESULT([failed to parse SMP_CACHE_BYTES value])
AC_MSG_FAILURE([Linux kernel headers found, but cacheline constant could not be computed at compile-time.])
fi
],[
# Explicitly validate the CPU type even on Linux if the header check fails
case "$host_cpu" in
x86_64*|amd64*|i386*|i486*|i586*|i686*)
AC_MSG_RESULT([linux fallback x86 64 bytes])
AC_DEFINE([LT_SMP_CACHE_BYTES], 64, [Fallback 64-byte alignment for Linux x86 hardware.])
;;
arm*|aarch64*|powerpc*|ppc*|s390x*)
AC_MSG_RESULT([linux fallback enterprise 128 bytes])
AC_DEFINE([LT_SMP_CACHE_BYTES], 128, [Fallback 128-byte alignment for Linux enterprise hardware.])
;;
*)
AC_MSG_RESULT([unrecognized CPU arch on Linux header fallback])
AC_MSG_FAILURE([Unrecognized CPU architecture ($host_cpu) on Linux fallback path. Aborting build.])
;;
esac
])
;;
*)
# REGION: Cross-Platform Strict Hardware Mapping (macOS, FreeBSD, OpenBSD, NetBSD)
case "$host_cpu" in
x86_64*|amd64*|i386*|i486*|i586*|i686*)
# Explicit x86 desktop hardware baseline block
AC_MSG_RESULT([$host_os ($host_cpu) standard x86 64 bytes])
AC_DEFINE([LT_SMP_CACHE_BYTES], 64, [Standard 64-byte alignment for stable x86 hardware layout.])
;;
arm*|aarch64*|powerpc*|ppc*|s390x*)
# Explicit modern enterprise and Apple Silicon hardware baseline block
AC_MSG_RESULT([$host_os ($host_cpu) stable enterprise 128 bytes])
AC_DEFINE([LT_SMP_CACHE_BYTES], 128, [Optimized 128-byte alignment for newer high-performance chipsets.])
;;
*)
# STRICT ENFORCEMENT: Fail the build immediately if the CPU isn't explicitly known
AC_MSG_RESULT([unrecognized architecture])
AC_MSG_FAILURE([The target CPU architecture ($host_cpu) is unrecognized. Aborting configuration to prevent fatal runtime false-sharing or memory misalignment errors.])
;;
esac
;;
esac
])
AC_DEFUN([TORRENT_CHECK_ALIGNED], [