bastring.h (class basic_string:Rep): Encode xlock opcode as .bytes instead of mnemonics.

Wed Jun  2 00:21:54 1999  Robert Lipe  <robertlipe@usa.net>
        * std/bastring.h (class basic_string:Rep): Encode xlock opcode
        as .bytes instead of mnemonics.

From-SVN: r27295

libstdc++/ChangeLog

+Wed Jun  2 00:21:54 1999  Robert Lipe  <robertlipe@usa.net>
+
+	* std/bastring.h (class basic_string:Rep): Encode xlock opcode
+	as .bytes instead of mnemonics.
+
 1999-05-20  Angela Marie Thomas <angela@cygnus.com>
 
 	* configure.in: Test for ${compiler_name}.exe as well.

libstdc++/std/bastring.h

@@ -77,8 +77,15 @@ private:
     void release ()
       {
 	size_t __val;
-	asm ("lock; xaddl %0, %2"
-	     : "=r" (__val) : "0" (-1), "m" (ref) : "memory");
+	// This opcode exists as a .byte instead of as a mnemonic for the
+	// benefit of SCO OpenServer 5.  The system assembler (which is 
+	// essentially required on this target) can't assemble xaddl in 
+	//COFF mode.
+	asm (".byte 0xf0, 0x0f, 0xc1, 0x02" // lock; xaddl %eax, (%edx)
+	    : "=a" (__val)
+	    : "0" (-1), "m" (ref), "d" (&ref)
+	    : "memory");
+
 	if (__val == 1)
 	  delete this;
       }