[commits] r11052 - in /fsf/trunk/libc: ChangeLog sysdeps/x86_64/multiarch/strstr.c

[eglibc@xxxxxxxxxx]

Author: eglibc
Date: Sun Jul 25 00:02:55 2010
New Revision: 11052

Log:
Import glibc-mainline for 2010-07-25

Modified:
    fsf/trunk/libc/ChangeLog
    fsf/trunk/libc/sysdeps/x86_64/multiarch/strstr.c

Modified: fsf/trunk/libc/ChangeLog
==============================================================================
--- fsf/trunk/libc/ChangeLog (original)
+++ fsf/trunk/libc/ChangeLog Sun Jul 25 00:02:55 2010
@@ -1,3 +1,8 @@
+2010-07-24  Ulrich Drepper  <drepper@xxxxxxxxxx>
+
+	* sysdeps/x86_64/multiarch/strstr.c (__m128i_strloadu_tolower): Use
+	lower-latency instructions.
+
 2010-07-23  Ulrich Drepper  <drepper@xxxxxxxxxx>
 
 	* string/test-strcasestr.c: New file.

Modified: fsf/trunk/libc/sysdeps/x86_64/multiarch/strstr.c
==============================================================================
--- fsf/trunk/libc/sysdeps/x86_64/multiarch/strstr.c (original)
+++ fsf/trunk/libc/sysdeps/x86_64/multiarch/strstr.c Sun Jul 25 00:02:55 2010
@@ -173,11 +173,17 @@
 {
   __m128i frag = __m128i_strloadu (p);
 
-  /* Convert frag to lower case for POSIX/C locale.  */
-  __m128i mask1 = _mm_cmpistrm (rangeuc, frag, 0x44);
-  __m128i mask2 = _mm_blendv_epi8 (u2ldelta, frag, mask1);
-  mask2 = _mm_sub_epi8 (mask2, u2ldelta);
-  return  _mm_blendv_epi8 (frag, mask2, mask1);
+#define UCLOW 0x4040404040404040ULL
+#define UCHIGH 0x5a5a5a5a5a5a5a5aULL
+#define LCQWORD 0x2020202020202020ULL
+  /* Compare if 'Z' > bytes. Inverted way to get a mask for byte <= 'Z'.  */
+  __m128i r2 = _mm_cmpgt_epi8 (_mm_set1_epi64x (UCHIGH), frag);
+  /* Compare if bytes are > 'A' - 1.  */
+  __m128i r1 = _mm_cmpgt_epi8 (frag, _mm_set1_epi64x (UCLOW));
+  /* Mask byte == ff if byte(r2) <= 'Z' and byte(r1) > 'A' - 1.  */
+  __m128i mask = _mm_and_si128 (r2, r1);
+  /* Apply lowercase bit 6 mask for above mask bytes == ff.  */
+  return _mm_or_si128 (frag, _mm_and_si128 (mask, _mm_set1_epi64x (LCQWORD)));
 }
 
 #endif