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-rw-r--r--configure.ac27
1 files changed, 25 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac
index e8a8b134b8..835dcdbf57 100644
--- a/configure.ac
+++ b/configure.ac
@@ -252,9 +252,32 @@ if test "x$CXXFLAGS_overridden" = "xno"; then
# Check for optional instruction set support. Enabling these does _not_ imply that all code will
# be compiled with them, rather that specific objects/libs may use them after checking for runtime
# compatibility.
- AX_CHECK_COMPILE_FLAG([-msse4.2],[[enable_sse42=yes; SSE42_CXXFLAGS="-msse4.2"]],,[[$CXXFLAG_WERROR]])
+ AX_CHECK_COMPILE_FLAG([-msse4.2],[[SSE42_CXXFLAGS="-msse4.2"]],,[[$CXXFLAG_WERROR]])
fi
+
+TEMP_CXXFLAGS="$CXXFLAGS"
+CXXFLAGS="$CXXFLAGS $SSE42_CXXFLAGS"
+AC_MSG_CHECKING(for assembler crc32 support)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdint.h>
+ #if defined(_MSC_VER)
+ #include <intrin.h>
+ #elif defined(__GNUC__) && defined(__SSE4_2__)
+ #include <nmmintrin.h>
+ #endif
+ ]],[[
+ uint64_t l = 0;
+ l = _mm_crc32_u8(l, 0);
+ l = _mm_crc32_u32(l, 0);
+ l = _mm_crc32_u64(l, 0);
+ return l;
+ ]])],
+ [ AC_MSG_RESULT(yes); enable_hwcrc32=yes],
+ [ AC_MSG_RESULT(no)]
+)
+CXXFLAGS="$TEMP_CXXFLAGS"
+
CPPFLAGS="$CPPFLAGS -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS"
AC_ARG_WITH([utils],
@@ -1138,7 +1161,7 @@ AM_CONDITIONAL([USE_QRCODE], [test x$use_qr = xyes])
AM_CONDITIONAL([USE_LCOV],[test x$use_lcov = xyes])
AM_CONDITIONAL([GLIBC_BACK_COMPAT],[test x$use_glibc_compat = xyes])
AM_CONDITIONAL([HARDEN],[test x$use_hardening = xyes])
-AM_CONDITIONAL([ENABLE_SSE42],[test x$enable_sse42 = xyes])
+AM_CONDITIONAL([ENABLE_HWCRC32],[test x$enable_hwcrc32 = xyes])
AC_DEFINE(CLIENT_VERSION_MAJOR, _CLIENT_VERSION_MAJOR, [Major version])
AC_DEFINE(CLIENT_VERSION_MINOR, _CLIENT_VERSION_MINOR, [Minor version])