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Improve performance on non-GCC hosts with __aligned__.

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This commit is contained in:
Paul Eggert 2011-01-17 20:54:23 -08:00
parent 9cc3a0c79c
commit 7cae64b4ee
6 changed files with 67 additions and 5 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2011-01-18 Paul Eggert <eggert@cs.ucla.edu>
* configure.in (HAVE_ATTRIBUTE_ALIGNED): Arrange for this to be
defined if the compiler supports GCC-style __attribute__
((__aligned__ ...)). IBM AIX and Oracle Solaris Studio support
this syntax.
2011-01-17 Paul Eggert <eggert@cs.ucla.edu>
Makefile.in: tidy up the building of lib

32
configure vendored
View file

@ -8278,6 +8278,37 @@ $as_echo "#define AC_APPLE_UNIVERSAL_BUILD 1" >>confdefs.h
esac
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __attribute__ ((__aligned__ (expr)))" >&5
$as_echo_n "checking for __attribute__ ((__aligned__ (expr)))... " >&6; }
if ${emacs_cv_attribute_aligned+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
char __attribute__ ((__aligned__ (1 << 3))) c;
int
main ()
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
emacs_cv_attribute_aligned=yes
else
emacs_cv_attribute_aligned=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $emacs_cv_attribute_aligned" >&5
$as_echo "$emacs_cv_attribute_aligned" >&6; }
if test $emacs_cv_attribute_aligned = yes; then
$as_echo "#define HAVE_ATTRIBUTE_ALIGNED 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether ${MAKE-make} sets \$(MAKE)" >&5
$as_echo_n "checking whether ${MAKE-make} sets \$(MAKE)... " >&6; }
set x ${MAKE-make}
@ -18959,4 +18990,3 @@ if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
$as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
fi

14
configure.in
View file

@ -1323,6 +1323,19 @@ AH_TEMPLATE(POINTER_TYPE,
dnl Check for endianess
AC_C_BIGENDIAN
AC_CACHE_CHECK([for __attribute__ ((__aligned__ (expr)))],
[emacs_cv_attribute_aligned],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[char __attribute__ ((__aligned__ (1 << 3))) c;]],
[[]])],
[emacs_cv_attribute_aligned=yes],
[emacs_cv_attribute_aligned=no])])
if test $emacs_cv_attribute_aligned = yes; then
AC_DEFINE([HAVE_ATTRIBUTE_ALIGNED], 1,
[Define to 1 if GCC-style __attribute__ ((__aligned__ (expr))) works.])
fi
dnl check for Make feature
AC_PROG_MAKE_SET
@ -3734,4 +3747,3 @@ if test ! -f src/.gdbinit && test -f $srcdir/src/.gdbinit; then
fi
], [GCC="$GCC" NON_GNU_CPP="$NON_GNU_CPP" CPP="$CPP" CPPFLAGS="$CPPFLAGS"])

8
src/ChangeLog
View file

@ -1,3 +1,11 @@
2011-01-18 Paul Eggert <eggert@cs.ucla.edu>
* lisp.h (DECL_ALIGN): Define if HAVE_ATTRIBUTE_ALIGNED, not if
defined __GNUC__. ../configure now checks for this GCC feature,
which is now also supported by IBM and Oracle compilers.
(USE_LSB_TAG) [defined DECL_ALIGN]: Also define if defined __sun,
since Solaris malloc returns mult-of-8.
2011-01-18 Stefan Monnier <monnier@iro.umontreal.ca>
* image.c (syms_of_image): Don't access XSYMBOL's internals directly.

3
src/config.in
View file

@ -115,6 +115,9 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
/* Define to 1 if ALSA is available. */
#undef HAVE_ALSA
/* Define to 1 if GCC-style __attribute__ ((__aligned__ (expr))) works. */
#undef HAVE_ATTRIBUTE_ALIGNED
/* Define to 1 if strtold conforms to C99. */
#undef HAVE_C99_STRTOLD

8
src/lisp.h
View file

@ -122,16 +122,18 @@ extern void die (const char *, const char *, int) NO_RETURN;
TYPEBITS-aligned. */
#ifndef NO_DECL_ALIGN
# ifndef DECL_ALIGN
/* What compiler directive should we use for non-gcc compilers? -stef */
# if defined (__GNUC__)
# if HAVE_ATTRIBUTE_ALIGNED
# define DECL_ALIGN(type, var) \
type __attribute__ ((__aligned__ (1 << GCTYPEBITS))) var
# else
/* What directives do other compilers use? */
# endif
# endif
#endif
/* Let's USE_LSB_TAG on systems where we know malloc returns mult-of-8. */
#if defined GNU_MALLOC || defined DOUG_LEA_MALLOC || defined __GLIBC__ || defined DARWIN_OS
#if (defined GNU_MALLOC || defined DOUG_LEA_MALLOC || defined __GLIBC__ \
|| defined DARWIN_OS || defined __sun)
/* We also need to be able to specify mult-of-8 alignment on static vars. */
# if defined DECL_ALIGN
# define USE_LSB_TAG