Use a simple loop on data shorter than software pipeline.

When data is shorter than software pipeline, recovery may fail. This
patch avoids it by using a simple loop on data shorter than software
pipeline.

diff --git a/ChangeLog b/ChangeLog
index a3c626c2aa981f374fa21c7327d330d7f74cc36c..c3918b74c1461035eff094823669cf90fbf66e6e 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2009-11-09  H.J. Lu  <hongjiu.lu@intel.com>
+
+       [BZ #10162]
+       * sysdeps/ia64/memchr.S: Use a simple loop on data shorter than
+       software pipeline.
+
 2009-11-09  Mike Frysinger  <vapier@gentoo.org>
 
        * sysdeps/unix/sysv/linux/i386/fallocate.c: Include errno.h.

diff --git a/sysdeps/ia64/memchr.S b/sysdeps/ia64/memchr.S
index cd062b2dd521c5777d805cbf07bbd78060f17299..e721e1714f3fc12c4ad1a61e685cc8dbce216804 100644 (file)
--- a/sysdeps/ia64/memchr.S
+++ b/sysdeps/ia64/memchr.S
@@ -71,7 +71,8 @@ ENTRY(__memchr)
        cmp.ne  p7, p0 = r0, r0         // clear p7
        extr.u  chr = in1, 0, 8         // chr = (unsigned char) in1
        mov     len = in2
-       cmp.gtu p6, p0 = 16, in2        // use a simple loop for short
+       // use a simple loop on data shorter than software pipeline
+       cmp.gtu p6, p0 = ((MEMLAT + 1) * 8), in2
 (p6)   br.cond.spnt .srchfew ;;        // searches
        sub     loopcnt = 8, tmp        // loopcnt = 8 - tmp
        cmp.eq  p6, p0 = tmp, r0