[2.27 COMMITTED][AArch64] Backport strcmp improvements

[2.27 COMMITTED][AArch64] Backport strcmp improvements

[Wilco Dijkstra]

commit d5f45a29ff152a079f3ab6b3f9a8f8dce261252f
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Thu Feb 22 23:48:13 2018 +0530

    aarch64/strcmp: fix misaligned loop jump target
    
    I accidentally set the loop jump back label as misaligned8 instead of
    do_misaligned.  The typo is harmless but it's always nice to not have
    to unnecessarily execute those two instructions.
    
        * sysdeps/aarch64/strcmp.S (do_misaligned): Jump back to
        do_misaligned, not misaligned8.
    
    (cherry picked from commit 6ca24c43481e2c93a6eec362b04c3e77a35b28e3)

diff --git a/ChangeLog b/ChangeLog
index 20d98f0..5ddc3e7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2019-09-06  Siddhesh Poyarekar  <siddhesh@sourceware.org>
 
+       * sysdeps/aarch64/strcmp.S (do_misaligned): Jump back to
+       do_misaligned, not misaligned8.
+
+2019-09-06  Siddhesh Poyarekar  <siddhesh@sourceware.org>
+
+       * sysdeps/aarch64/strcmp.S (misaligned8): Compare dword at a
+       time whenever possible.
+
+2019-09-06  Siddhesh Poyarekar  <siddhesh@sourceware.org>
+
        * sysdeps/aarch64/memcmp.S: Widen comparison to 16 bytes at a
        time.
 
diff --git a/sysdeps/aarch64/strcmp.S b/sysdeps/aarch64/strcmp.S
index 0b22f16..267aa4b 100644
--- a/sysdeps/aarch64/strcmp.S
+++ b/sysdeps/aarch64/strcmp.S
@@ -158,7 +158,7 @@ L(do_misaligned):
        ccmp    data1w, data2w, #0, cs  /* NZCV = 0b0000.  */
        b.ne    L(done)
        tst     src1, #7
-       b.ne    L(misaligned8)
+       b.ne    L(do_misaligned)
 
 L(loop_misaligned):
        /* Test if we are within the last dword of the end of a 4K page.  If