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authorIan Romanick <idr@us.ibm.com>2004-10-13 17:29:33 +0000
committerIan Romanick <idr@us.ibm.com>2004-10-13 17:29:33 +0000
commit81f67fc4e9621f08f46c8219f5ab5dc5c329b146 (patch)
tree8f78d469d2644f79f6890e8b21d945057bbacdf1 /src
parent612d5f6e84865e9ba2ac97bd2e263e279caeed41 (diff)
Eliminate the funky SSE exception test from DRI builds. It's not need
(see the comment in the code), and it's just annoying.
Diffstat (limited to 'src')
-rw-r--r--src/mesa/x86/common_x86.c22
1 files changed, 16 insertions, 6 deletions
diff --git a/src/mesa/x86/common_x86.c b/src/mesa/x86/common_x86.c
index 90fa7e48ff..2d830b4b0f 100644
--- a/src/mesa/x86/common_x86.c
+++ b/src/mesa/x86/common_x86.c
@@ -22,13 +22,16 @@
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
-/*
+/**
+ * \file common_x86.c
+ *
* Check CPU capabilities & initialize optimized funtions for this particular
* processor.
*
- * Written by Holger Waechtler <holger@akaflieg.extern.tu-berlin.de>
- * Changed by Andre Werthmann <wertmann@cs.uni-potsdam.de> for using the
- * new SSE functions.
+ * Changed by Andre Werthmann for using the new SSE functions.
+ *
+ * \author Holger Waechtler <holger@akaflieg.extern.tu-berlin.de>
+ * \author Andre Werthmann <wertmann@cs.uni-potsdam.de>
*/
/* XXX these includes should probably go into imports.h or glheader.h */
@@ -87,12 +90,19 @@ static void message( const char *msg )
* loop in the signal delivery from the kernel as we can't interact with
* the SIMD FPU state to clear the exception bits. Either way, this is
* not good.
+ *
+ * However, I have been told by Alan Cox that all 2.4 (and later) Linux
+ * kernels provide full SSE support on all processors that expose SSE via
+ * the CPUID mechanism. It just so happens that this is the exact set of
+ * kernels supported DRI. Therefore, when building for DRI the funky SSE
+ * exception test is omitted.
*/
extern void _mesa_test_os_sse_support( void );
extern void _mesa_test_os_sse_exception_support( void );
-#if defined(__linux__) && defined(_POSIX_SOURCE) && defined(X86_FXSR_MAGIC)
+#if defined(__linux__) && defined(_POSIX_SOURCE) && defined(X86_FXSR_MAGIC) \
+ && !defined(DRI_NEW_INTERFACE_ONLY)
static void sigill_handler( int signal, struct sigcontext sc )
{
message( "SIGILL, " );
@@ -142,7 +152,7 @@ static void sigfpe_handler( int signal, struct sigcontext sc )
*/
static void check_os_sse_support( void )
{
-#if defined(__linux__)
+#if defined(__linux__) && !defined(DRI_NEW_INTERFACE_ONLY)
#if defined(_POSIX_SOURCE) && defined(X86_FXSR_MAGIC)
struct sigaction saved_sigill;
struct sigaction saved_sigfpe;