diff --git a/string/strchrnul.c b/string/strchrnul.c
index 4986c5d..ea91195 100644
--- a/string/strchrnul.c
+++ b/string/strchrnul.c
@@ -21,9 +21,8 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <string.h>
-#include <memcopy.h>
-#include <stdlib.h>
-
+#include <libc-internal.h>
+#include <stdint.h>
 #undef __strchrnul
 #undef strchrnul
 
@@ -31,146 +30,144 @@
 # define STRCHRNUL __strchrnul
 #endif
 
-/* Find the first occurrence of C in S or the final NUL byte.  */
-#ifdef AS_STRCHRNUL
-static __always_inline
-#endif
-char *
-STRCHRNUL (s, c_in)
-     const char *s;
-     int c_in;
-{
-  const unsigned char *char_ptr;
-  const unsigned long int *longword_ptr;
-  unsigned long int longword, magic_bits, charmask;
-  unsigned char c;
-
-  c = (unsigned char) c_in;
-
-  /* Handle the first few characters by reading one character at a time.
-     Do this until CHAR_PTR is aligned on a longword boundary.  */
-  for (char_ptr = (const unsigned char *) s;
-       ((unsigned long int) char_ptr & (sizeof (longword) - 1)) != 0;
-       ++char_ptr)
-    if (*char_ptr == c || *char_ptr == '\0')
-      return (void *) char_ptr;
+static const unsigned long int ones = (~0UL / 255); /* 0x0101...*/
+static const unsigned long int add = 127 * (~0UL / 255);
+static const unsigned long int high_bits = 128 * (~0UL / 255);
 
-  /* All these elucidatory comments refer to 4-byte longwords,
-     but the theory applies equally well to 8-byte longwords.  */
+/* Use vector arithmetic tricks. Idea is to take expression works on
+   unsigned byte and evaluates 0 for nozero byte and nonzero on zero byte.
+   Our expression is ((s + 127) ^ (~s)) & 128  
+   Now we evaluate this expression on each byte in parallel and on first 
+   nonzero byte our expression will have nonzero value. */
 
-  longword_ptr = (unsigned long int *) char_ptr;
+static always_inline
+unsigned long int 
+contains_zero (unsigned long int s)
+{
+  return ((s + add) ^ ~s) & high_bits;
+}
 
-  /* Bits 31, 24, 16, and 8 of this number are zero.  Call these bits
-     the "holes."  Note that there is a hole just to the left of
-     each byte, with an extra at the end:
+static always_inline
+int
+found_in_long_bytes(char *s, unsigned long int cmask, char **result)
+{
+  const unsigned long int *lptr = (const unsigned long int *) s;
+  unsigned long int mask = contains_zero (*lptr) | contains_zero (*lptr ^ cmask);
+  if (mask)
+    {
+      *result = s + ffsl (mask) / 8 - 1;
+      return 1;
+    }
+  else
+    return 0;
+}
 
-     bits:  01111110 11111110 11111110 11111111
-     bytes: AAAAAAAA BBBBBBBB CCCCCCCC DDDDDDDD
+#define LSIZE sizeof (unsigned long int)
+#define CROSS_PAGE(x, n) (((uintptr_t)x)%4096 >= 4096 - n)
 
-     The 1-bits make sure that carries propagate to the next 0-bit.
-     The 0-bits provide holes for carries to fall into.  */
-  switch (sizeof (longword))
+/* Find the first occurrence of C in S or the final NUL byte.  */
+#ifdef AS_STRCHR
+static always_inline
+#endif
+char *
+STRCHRNUL (const char *s_in, int c_in)
+{
+  unsigned long int mask;
+  const unsigned long int *lptr;
+  char *s = (char *) s_in;
+  unsigned char c = (unsigned char) c_in;
+  char *r;
+  unsigned long int cmask = c * ones;
+
+#if _STRING_ARCH_unaligned
+  /* We fetch 32 bytes while not crossing page boundary. 
+     Most strings in practice are of that size and we avoid a loop.
+     This looks as best in practice, alternative below uses aligned load 
+     but is slower when string starts just few 
+     bytes before 32 byte boundary. A tradeoff is that we rarely could 
+     fetch extra cache line without needing it but this optimization 
+     does pay for that. */
+  if (!CROSS_PAGE(s, 32))
     {
-    case 4: magic_bits = 0x7efefeffL; break;
-    case 8: magic_bits = ((0x7efefefeL << 16) << 16) | 0xfefefeffL; break;
-    default:
-      abort ();
+      if (found_in_long_bytes (s + 0 * LSIZE, cmask, &r))
+        return r;
+      if (found_in_long_bytes (s + 1 * LSIZE, cmask, &r))
+        return r;
+      if (found_in_long_bytes (s + 2 * LSIZE, cmask, &r))
+        return r;
+      if (found_in_long_bytes (s + 3 * LSIZE, cmask, &r))
+        return r;
+      if (sizeof (unsigned long int) == 4)
+        {
+          if (found_in_long_bytes (s + 0 * LSIZE, cmask, &r))
+            return r;
+          if (found_in_long_bytes (s + 1 * LSIZE, cmask, &r))
+            return r;
+          if (found_in_long_bytes (s + 2 * LSIZE, cmask, &r))
+            return r;
+          if (found_in_long_bytes (s + 3 * LSIZE, cmask, &r))
+            return r;
+        }
     }
+  else
+    {
+#endif
+  /* We need use aligned loads. For first load we read some bytes before 
+     start that we discard by shifting them down. */
+ 
+      char *s_aligned = PTR_ALIGN_DOWN (s, LSIZE);
+      lptr = (const unsigned long int *) s_aligned;
+      mask = (contains_zero (*lptr) 
+              | contains_zero (*lptr ^ cmask))
+             >> (8 * (s_aligned - s));
+
+      if (mask)
+        return s + ffsl (mask) / 8 - 1;
+
+      if (found_in_long_bytes (s + 1 * LSIZE, cmask, &r))
+        return r;
+      if (found_in_long_bytes (s + 2 * LSIZE, cmask, &r))
+        return r;
+      if (found_in_long_bytes (s + 3 * LSIZE, cmask, &r))
+        return r;
+#if _STRING_ARCH_unaligned
+    }
+#endif
+   /* Now we read enough bytes to start a loop.  */
 
-  /* Set up a longword, each of whose bytes is C.  */
-  charmask = c | (c << 8);
-  charmask |= charmask << 16;
-  if (sizeof (longword) > 4)
-    /* Do the shift in two steps to avoid a warning if long has 32 bits.  */
-    charmask |= (charmask << 16) << 16;
-  if (sizeof (longword) > 8)
-    abort ();
-
-  /* Instead of the traditional loop which tests each character,
-     we will test a longword at a time.  The tricky part is testing
-     if *any of the four* bytes in the longword in question are zero.  */
-  for (;;)
+  char *s_loop = PTR_ALIGN_DOWN (s, 4 * LSIZE);
+  do 
     {
-      /* We tentatively exit the loop if adding MAGIC_BITS to
-	 LONGWORD fails to change any of the hole bits of LONGWORD.
-
-	 1) Is this safe?  Will it catch all the zero bytes?
-	 Suppose there is a byte with all zeros.  Any carry bits
-	 propagating from its left will fall into the hole at its
-	 least significant bit and stop.  Since there will be no
-	 carry from its most significant bit, the LSB of the
-	 byte to the left will be unchanged, and the zero will be
-	 detected.
-
-	 2) Is this worthwhile?  Will it ignore everything except
-	 zero bytes?  Suppose every byte of LONGWORD has a bit set
-	 somewhere.  There will be a carry into bit 8.  If bit 8
-	 is set, this will carry into bit 16.  If bit 8 is clear,
-	 one of bits 9-15 must be set, so there will be a carry
-	 into bit 16.  Similarly, there will be a carry into bit
-	 24.  If one of bits 24-30 is set, there will be a carry
-	 into bit 31, so all of the hole bits will be changed.
-
-	 The one misfire occurs when bits 24-30 are clear and bit
-	 31 is set; in this case, the hole at bit 31 is not
-	 changed.  If we had access to the processor carry flag,
-	 we could close this loophole by putting the fourth hole
-	 at bit 32!
-
-	 So it ignores everything except 128's, when they're aligned
-	 properly.
-
-	 3) But wait!  Aren't we looking for C as well as zero?
-	 Good point.  So what we do is XOR LONGWORD with a longword,
-	 each of whose bytes is C.  This turns each byte that is C
-	 into a zero.  */
-
-      longword = *longword_ptr++;
-
-      /* Add MAGIC_BITS to LONGWORD.  */
-      if ((((longword + magic_bits)
-
-	    /* Set those bits that were unchanged by the addition.  */
-	    ^ ~longword)
-
-	   /* Look at only the hole bits.  If any of the hole bits
-	      are unchanged, most likely one of the bytes was a
-	      zero.  */
-	   & ~magic_bits) != 0 ||
-
-	  /* That caught zeroes.  Now test for C.  */
-	  ((((longword ^ charmask) + magic_bits) ^ ~(longword ^ charmask))
-	   & ~magic_bits) != 0)
-	{
-	  /* Which of the bytes was C or zero?
-	     If none of them were, it was a misfire; continue the search.  */
-
-	  const unsigned char *cp = (const unsigned char *) (longword_ptr - 1);
-
-	  if (*cp == c || *cp == '\0')
-	    return (char *) cp;
-	  if (*++cp == c || *cp == '\0')
-	    return (char *) cp;
-	  if (*++cp == c || *cp == '\0')
-	    return (char *) cp;
-	  if (*++cp == c || *cp == '\0')
-	    return (char *) cp;
-	  if (sizeof (longword) > 4)
-	    {
-	      if (*++cp == c || *cp == '\0')
-		return (char *) cp;
-	      if (*++cp == c || *cp == '\0')
-		return (char *) cp;
-	      if (*++cp == c || *cp == '\0')
-		return (char *) cp;
-	      if (*++cp == c || *cp == '\0')
-		return (char *) cp;
-	    }
-	}
+      s_aligned += 4 * LSIZE;
+      lptr = (const unsigned long int *) (s_loop + 0 * LSIZE);
+      mask = contains_zero (*lptr) | contains_zero (*lptr ^ cmask);
+      lptr = (const unsigned long int *) (s_loop + 1 * LSIZE);
+      mask |= contains_zero (*lptr) | contains_zero (*lptr ^ cmask);
+      lptr = (const unsigned long int *) (s_loop + 2 * LSIZE);
+      mask |= contains_zero (*lptr) | contains_zero (*lptr ^ cmask);
+      lptr = (const unsigned long int *) (s_loop + 3 * LSIZE);
+      mask |= contains_zero (*lptr) | contains_zero (*lptr ^ cmask);
+
     }
+  while (!mask);
+ if (found_in_long_bytes (s_loop + 0 * LSIZE, cmask, &r))
+   return r;
+ if (found_in_long_bytes (s_loop + 1 * LSIZE, cmask, &r))
+   return r;
+ if (found_in_long_bytes (s_loop + 2 * LSIZE, cmask, &r))
+   return r;
+ found_in_long_bytes (s_loop + 3 * LSIZE, cmask, &r);
+ return r;
+}
+
+
+char *strchr(char *s, int c)
+{
+  char *r = __strchrnule(s,c);
+  return *r ? r : 0;
 
-  /* This should never happen.  */
-  return NULL;
 }
 
+#ifndef AS_STRCHR
 weak_alias (__strchrnul, strchrnul)
+#endif
