From 79a84232d992892d62e12b33397d833e59f6b8d9 Mon Sep 17 00:00:00 2001
From: Miguel Freitas <miguelfreitas@users.sourceforge.net>
Date: Sun, 18 Nov 2001 23:00:34 +0000
Subject: test OS support for SSE instructions

CVS patchset: 1073
CVS date: 2001/11/18 23:00:34
---
 src/xine-utils/cpu_accel.c | 27 ++++++++++++++++++++++++++-
 src/xine-utils/memcpy.c    | 27 +++++----------------------
 2 files changed, 31 insertions(+), 23 deletions(-)

diff --git a/src/xine-utils/cpu_accel.c b/src/xine-utils/cpu_accel.c
index 838366c77..a5c7749cd 100644
--- a/src/xine-utils/cpu_accel.c
+++ b/src/xine-utils/cpu_accel.c
@@ -21,7 +21,10 @@
 
 #include "config.h"
 
+#include <stdio.h>
 #include <inttypes.h>
+#include <signal.h>
+#include <setjmp.h>
 
 #include "attributes.h"
 #include "xineutils.h"
@@ -86,8 +89,11 @@ static uint32_t x86_accel (void)
 
   caps = MM_ACCEL_X86_MMX;
   if (edx & 0x02000000)       /* SSE - identical to AMD MMX extensions */
-    caps = MM_ACCEL_X86_MMX | MM_ACCEL_X86_MMXEXT;
+    caps = MM_ACCEL_X86_SSE | MM_ACCEL_X86_MMXEXT;
 
+  if (edx & 0x04000000)       /* SSE2 */
+    caps |= MM_ACCEL_X86_SSE2;  
+    
   cpuid (0x80000000, eax, ebx, ecx, edx);
   if (eax < 0x80000001)       /* no extended capabilities */
     return caps;
@@ -105,6 +111,13 @@ static uint32_t x86_accel (void)
 #endif
 
 
+static jmp_buf sigill_return;
+
+static void sigill_handler (int n) {
+  printf ("cpu_accel: OS doesn't support SSE instructions.\n");
+  longjmp(sigill_return, 1);
+}
+
 uint32_t xine_mm_accel (void)
 {
 #ifdef ARCH_X86
@@ -113,7 +126,19 @@ uint32_t xine_mm_accel (void)
 
   if (!got_accel) {
     got_accel = 1;
+    
     accel = x86_accel ();
+    
+    /* test OS support for SSE */
+    if( accel & MM_ACCEL_X86_SSE ) {
+      if (setjmp(sigill_return)) {
+        accel &= ~(MM_ACCEL_X86_SSE|MM_ACCEL_X86_SSE2);
+      } else {
+        signal (SIGILL, sigill_handler); 
+        __asm __volatile ("xorps %xmm0, %xmm0");
+        signal (SIGILL, SIG_DFL);
+      }
+    }
   }
 
   return accel;
diff --git a/src/xine-utils/memcpy.c b/src/xine-utils/memcpy.c
index 3e1de857d..fe548c987 100644
--- a/src/xine-utils/memcpy.c
+++ b/src/xine-utils/memcpy.c
@@ -35,8 +35,6 @@
 
 #include <stdlib.h>
 #include <string.h>
-#include <signal.h>
-#include <setjmp.h>
 #include "xine_internal.h"
 #include "xineutils.h"
  
@@ -368,9 +366,7 @@ static struct {
   { "linux kernel memcpy()", linux_kernel_memcpy, 0, 0 },
   { "MMX optimized memcpy()", mmx_memcpy, 0, MM_MMX },
   { "MMXEXT optimized memcpy()", mmx2_memcpy, 0, MM_MMXEXT },
-# ifndef __FreeBSD__
   { "SSE optimized memcpy()", sse_memcpy, 0, MM_MMXEXT|MM_SSE },
-# endif
 #endif /* ARCH_X86 */
   { NULL, NULL, 0, 0 }
 };
@@ -391,15 +387,6 @@ static unsigned long long int rdtsc()
 }
 #endif
 
-static jmp_buf sigill_return;
-
-static void sigill_handler (int n) {
-
-  printf ("memcpy: SIGILL catched\n");
-
-  longjmp(sigill_return, 1);
-}
-
 
 #define BUFSIZE 1024*1024
 void xine_probe_fast_memcpy(config_values_t *config)
@@ -408,8 +395,11 @@ void xine_probe_fast_memcpy(config_values_t *config)
   char *buf1, *buf2;
   int i, j, best;
   static int config_flags = -1;
-  static char *memcpy_methods[] = {"probe", "glibc", "kernel",
-				   "mmx", "mmxext", "sse", NULL};
+  static char *memcpy_methods[] = {"probe", "glibc",
+#ifdef ARCH_X86
+     "kernel", "mmx", "mmxext", "sse", 
+#endif
+     NULL};
   
 #ifdef ARCH_X86
   config_flags = xine_mm_accel();
@@ -453,19 +443,12 @@ void xine_probe_fast_memcpy(config_values_t *config)
          memcpy_method[i].cpu_require )
       continue;
 
-    if (setjmp(sigill_return))
-      continue;
-
-    signal (SIGILL, sigill_handler); 
-
     t = rdtsc();
     for(j=0;j<50;j++) {	  
       memcpy_method[i].function(buf2,buf1,BUFSIZE);
       memcpy_method[i].function(buf1,buf2,BUFSIZE);
     }     
 
-    signal (SIGILL, SIG_DFL);
-    
     t = rdtsc() - t;
     memcpy_method[i].time = t;
     
-- 
cgit v1.2.3