(extendsidi2): Use cdq or cltd, not cwtl.

From-SVN: r4371

gcc/config/i386/i386.md

@@ -1130,8 +1130,14 @@
   "*
 {
   if (REGNO (operands[0]) == 0)
-    /* This used to be cwtl, but that extends HI to SI somehow.  */
-    return \"cdq\";
+    {
+      /* This used to be cwtl, but that extends HI to SI somehow.  */
+#ifdef INTEL_SYNTAX
+      return \"cdq\";
+#else
+      return \"cltd\";
+#endif
+    }
 
   operands[1] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1);
   output_asm_insn (AS2 (mov%L0,%0,%1), operands);