On Sat, Dec 6, 2014 at 8:52 PM, Timothy Arceri <[email protected]> wrote: > Nowadays GCC assumes stack pointer is 16-byte aligned even on 32-bits, but > that is an assumption OpenGL drivers (or any dynamic library for that matter) > can't afford to make as there are many closed- and open- source application > binaries out there that only assume 4-byte stack alignment. > > https://bugs.freedesktop.org/show_bug.cgi?id=86788 > --- > The bug reporter has tested that this fixes the problem. But I haven't > tested the cross compile stuff. e.g. building 64-bit from 32-bit > not sure if anyone would acctaully be building that way. > > Please note if this patch is ok it should also be applied to 10.4 with > the last hunk removed. > > configure.ac | 17 +++++++++++++++++ > src/mesa/Makefile.am | 4 ++++ > src/mesa/main/sse_minmax.c | 3 --- > 3 files changed, 21 insertions(+), 3 deletions(-) > > diff --git a/configure.ac b/configure.ac > index b0df1bb..6bb43f8 100644 > --- a/configure.ac > +++ b/configure.ac > @@ -474,6 +474,21 @@ fi > dnl > dnl Arch/platform-specific settings > dnl > +align_check_arch="" > +if test "x$cross_compiling" = xno; then > + case "$host_cpu" in > + x86_64|amd64) > + align_check_arch=x86_64 > + ;; > + esac > +else > + case "$host_cpu" in > + i?86) > + align_check_arch=x86_64
This looks wrong. > + ;; This is usually aligned with the code in the case. > + esac > +fi > + > AC_ARG_ENABLE([asm], > [AS_HELP_STRING([--disable-asm], > [disable assembly usage @<:@default=enabled on supported > plaforms@:>@])], > @@ -2087,6 +2102,8 @@ AM_CONDITIONAL(HAVE_X11_DRIVER, test > "x$enable_xlib_glx" = xyes) > AM_CONDITIONAL(HAVE_OSMESA, test "x$enable_osmesa" = xyes) > AM_CONDITIONAL(HAVE_GALLIUM_OSMESA, test "x$enable_gallium_osmesa" = xyes) > > +AM_CONDITIONAL(HAVE_16BYTE_ALIGN, test "x$align_check_arch" = xx86_64) We definitely need a better name. But, more importantly, isn't the test wrong? You only want to do this on 32-bit. Søren's patch to pixman does this check rather nicely, I think. See http://lists.freedesktop.org/archives/pixman/2013-October/003077.html _______________________________________________ mesa-dev mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-dev
