Add some branch prediction.
authordrepper <drepper>
Fri, 12 Oct 2007 04:40:33 +0000 (04:40 +0000)
committerdrepper <drepper>
Fri, 12 Oct 2007 04:40:33 +0000 (04:40 +0000)
iconv/gconv_simple.c

index 343c275..ec8f38a 100644 (file)
@@ -1,5 +1,5 @@
 /* Simple transformations functions.
-   Copyright (C) 1997-2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 1997-2003, 2004, 2005, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -880,7 +880,7 @@ ucs4le_internal_loop_single (struct __gconv_step *step,
   {                                                                          \
     uint32_t wc = *((const uint32_t *) inptr);                               \
                                                                              \
-    if (wc < 0x80)                                                           \
+    if (__builtin_expect (wc < 0x80, 1))                                     \
       /* It's an one byte sequence.  */                                              \
       *outptr++ = (unsigned char) wc;                                        \
     else if (__builtin_expect (wc <= 0x7fffffff, 1))                         \
@@ -940,21 +940,19 @@ ucs4le_internal_loop_single (struct __gconv_step *step,
 #define LOOPFCT                        FROM_LOOP
 #define BODY \
   {                                                                          \
-    uint32_t ch;                                                             \
-    uint_fast32_t cnt;                                                       \
-    uint_fast32_t i;                                                         \
-                                                                             \
     /* Next input byte.  */                                                  \
-    ch = *inptr;                                                             \
+    uint32_t ch = *inptr;                                                    \
                                                                              \
-    if (ch < 0x80)                                                           \
+    if (__builtin_expect (ch < 0x80, 1))                                     \
       {                                                                              \
        /* One byte sequence.  */                                             \
-       cnt = 1;                                                              \
        ++inptr;                                                              \
       }                                                                              \
     else                                                                     \
       {                                                                              \
+       uint_fast32_t cnt;                                                    \
+       uint_fast32_t i;                                                      \
+                                                                             \
        if (ch >= 0xc2 && ch < 0xe0)                                          \
          {                                                                   \
            /* We expect two bytes.  The first byte cannot be 0xc0 or 0xc1,   \