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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - (bisected) 32bit UrbanTerror 4.1 timedemo sse4.1 segfault..."
href="https://bugs.freedesktop.org/show_bug.cgi?id=86788#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - (bisected) 32bit UrbanTerror 4.1 timedemo sse4.1 segfault..."
href="https://bugs.freedesktop.org/show_bug.cgi?id=86788">bug 86788</a>
from <span class="vcard"><a class="email" href="mailto:jfonseca@vmware.com" title="José Fonseca <jfonseca@vmware.com>"> <span class="fn">José Fonseca</span></a>
</span></b>
<pre>This patch might help:
diff --git a/src/mesa/main/sse_minmax.c b/src/mesa/main/sse_minmax.c
index 222ac14..c3ec420 100644
--- a/src/mesa/main/sse_minmax.c
+++ b/src/mesa/main/sse_minmax.c
@@ -31,6 +31,9 @@
#include <stdint.h>
void
+#if !defined(__x86_64__)
+__attribute__((force_align_arg_pointer))
+#endif
_mesa_uint_array_min_max(const unsigned *ui_indices, unsigned *min_index,
unsigned *max_index, const unsigned count)
{
See
<a href="https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#index-g_t_0040code_007bforce_005falign_005farg_005fpointer_007d-attribute-3040">https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#index-g_t_0040code_007bforce_005falign_005farg_005fpointer_007d-attribute-3040</a>
for more info.
But this is still not safe, because gcc might still use msse behind our backs.
We really must modify configure.ac and Makefiles to use -mstackrealign
-mincoming-stack-boundary=2 whenever we use -msse* on x86 platforms. (x86_64 is
not necessary)</pre>
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