Do cld before each string move/compare.

From-SVN: r2125

gcc/config/i386/i386.md

@@ -3912,6 +3912,7 @@
 {
   rtx xops[2];
 
+  output_asm_insn (\"cld\", operands);
   if (GET_CODE (operands[2]) == CONST_INT)
     {
       if (INTVAL (operands[2]) & ~0x03)
@@ -3989,6 +3990,7 @@
 
   label = gen_label_rtx ();
 
+  output_asm_insn (\"cld\", operands);
   output_asm_insn (AS2 (xor%B0,%0,%0), operands);
   output_asm_insn (\"repz\;cmps%B2\", operands);
   output_asm_insn (\"je %l0\", &label);
@@ -4022,6 +4024,7 @@
   xops[0] = gen_rtx (REG, QImode, 0);
   xops[1] = CONST0_RTX (QImode);
 
+  output_asm_insn (\"cld\", operands);
   output_asm_insn (AS2 (test%B0,%1,%0), xops);
   return \"repz\;cmps%B2\";
 }")
@@ -4183,6 +4186,7 @@
 
   xops[0] = operands[0];
   xops[1] = constm1_rtx;
+  output_asm_insn (\"cld\", operands);
   output_asm_insn (AS2 (mov%L0,%1,%0), xops);
   return \"repnz\;scas%B2\";
 }")