gcc.s_lock.h

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Index: src/include/storage/s_lock.h
===================================================================
RCS file: /home/projects/pgsql/cvsroot/pgsql/src/include/storage/s_lock.h,v
retrieving revision 1.75
diff -u -r1.75 s_lock.h
--- src/include/storage/s_lock.h	2000/12/03 14:41:42	1.75
+++ src/include/storage/s_lock.h	2000/12/24 20:04:59
@@ -79,6 +79,48 @@
  * All the gcc inlines
  */
 
+#if defined(__alpha)
+#define __HAVE_ALPHA_TAS__  
+/* avoid the __alpha && __osf__ stuff below */
+
+/*
+  ow... that hurt. perl hackers should not muck with assembly. I believe this
+  is correct. for more info on Alpha assembly, or to prove that this monkey 
+  hacked some Scr3WeDuP assembly, er, I mean clean up the mess below, see
+    http://tru64unix.compaq.com/faqs/publications/base_doc/DOCUMENTATION/V40D_HTML/APS31DTE/TITLE.HTM
+      (or for an unauthorized copy/mirror)
+    http://rcfile.org/alpha/asm/
+*/
+
+static __inline__ int
+tas(volatile slock_t *lock)
+{
+   slock_t  _res;
+   slock_t  temp;
+
+   __asm__
+   __volatile__
+   (
+   "1: ldq_l %0, %1       \n"
+   "   and   %0, 1, %2    \n"
+   "   bne   %2, 4f       \n"
+   "   xor   %0, 1, %0    \n"
+   "   stq_c %0, %1       \n"
+   "   beq   %0, 3f       \n"
+   "   mb                 \n"
+   "   br    4f           \n"
+   "3: br    1b           \n"
+   "4: cmpeq %2, 0, %2    \n"
+   "   xor   %2, 1, %2    \n"
+     : "=&r" (temp),
+       "=m"  (*lock),
+       "=&r" (_res)
+     : "m"   (*lock)
+   );
+   return (int) _res;
+}
+
+#endif /* __alpha */
 
 #if defined(__i386__)
 #define TAS(lock) tas(lock)
@@ -283,6 +325,7 @@
  * These are the platforms that have common code for gcc and non-gcc
  */
 
+#if !defined(__HAVE_ALPHA_TAS__)
 
 #if defined(__alpha)
 
@@ -333,6 +376,7 @@
 
 #endif /* __alpha */
 
+#endif /* __HAVE_ALPHA_TAS__ */
 
 #if defined(__hpux)
 /*