--- /dev/null
+diff -ruN postgresql-7.4.7-old/src/include/storage/s_lock.h postgresql-7.4.7/src/include/storage/s_lock.h
+--- postgresql-7.4.7-old/src/include/storage/s_lock.h 2004-06-15 16:09:30.000000000 +0200
++++ postgresql-7.4.7/src/include/storage/s_lock.h 2004-06-15 16:19:02.000000000 +0200
+@@ -125,7 +125,7 @@
+ __asm__ __volatile__(
+ " xchg4 %0=%1,%2 \n"
+ : "=r"(ret), "=m"(*lock)
+-: "r"(1), "1"(*lock)
++: "r"(1), "m"(*lock)
+ : "memory");
+
+ return (int) ret;
+@@ -294,7 +294,7 @@
+ " tas %1 \n"
+ " sne %0 \n"
+ : "=d"(rv), "=m"(*lock)
+-: "1"(*lock)
++: "m"(*lock)
+ : "cc");
+
+ return rv;