lex.c (search_line_sse42): New main loop using asm flag outputs.

	* lex.c (search_line_sse42) [__GCC_ASM_FLAG_OUTPUTS__]: New main
	loop using asm flag outputs.

From-SVN: r225160

libcpp/ChangeLog

+2015-06-30  Uros Bizjak  <ubizjak@gmail.com>
+
+	* lex.c (search_line_sse42) [__GCC_ASM_FLAG_OUTPUTS__]: New main
+	loop using asm flag outputs.
+
 2015-06-08  Marek Polacek  <polacek@redhat.com>
 
 	PR c/66415

libcpp/lex.c

@@ -450,15 +450,33 @@ search_line_sse42 (const uchar *s, const uchar *end)
       s = (const uchar *)((si + 16) & -16);
     }
 
-  /* Main loop, processing 16 bytes at a time.  By doing the whole loop
-     in inline assembly, we can make proper use of the flags set.  */
-  __asm (      "sub $16, %1\n"
-	"	.balign 16\n"
+  /* Main loop, processing 16 bytes at a time.  */
+#ifdef __GCC_ASM_FLAG_OUTPUTS__
+  while (1)
+    {
+      char f;
+
+      /* By using inline assembly instead of the builtin,
+	 we can use the result, as well as the flags set.  */
+      __asm ("%vpcmpestri\t$0, %2, %3"
+	     : "=c"(index), "=@ccc"(f)
+	     : "m"(*s), "x"(search), "a"(4), "d"(16));
+      if (f)
+	break;
+      
+      s += 16;
+    }
+#else
+  s -= 16;
+  /* By doing the whole loop in inline assembly,
+     we can make proper use of the flags set.  */
+  __asm (      ".balign 16\n"
 	"0:	add $16, %1\n"
-	"	%vpcmpestri $0, (%1), %2\n"
+	"	%vpcmpestri\t$0, (%1), %2\n"
 	"	jnc 0b"
 	: "=&c"(index), "+r"(s)
 	: "x"(search), "a"(4), "d"(16));
+#endif
 
  found:
   return s + index;