From: Alan Lawrence <alan.lawrence@arm.com>
Date: Fri, 2 May 2014 15:11:04 +0000 (+0000)
Subject: One-line tidy of bit-twiddle expression in aarch64.c
X-Git-Tag: releases/gcc-5.1.0~7810
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0696116a28a8507e59700b78a827217f1db6a43f;p=thirdparty%2Fgcc.git

One-line tidy of bit-twiddle expression in aarch64.c

	* config/aarch64/aarch64.c (aarch64_expand_vec_perm_1): Tidy bit-flip
	expression.

From-SVN: r210005
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 817fb2629f41..69342ebbb91d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2014-05-02  Alan Lawrence  <alan.lawrence@arm.com>
+
+	* config/aarch64/aarch64.c (aarch64_expand_vec_perm_1): Tidy bit-flip
+	expression.
+
 2014-05-02  Marek Polacek  <polacek@redhat.com>
 
 	* doc/invoke.texi: Describe -fsanitize=float-divide-by-zero.
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 94e05bb5e3ff..8655f049ba46 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -8180,8 +8180,9 @@ aarch64_expand_vec_perm_const_1 (struct expand_vec_perm_d *d)
       unsigned i, nelt = d->nelt;
       rtx x;
 
+      gcc_assert (nelt == (nelt & -nelt));
       for (i = 0; i < nelt; ++i)
-	d->perm[i] = (d->perm[i] + nelt) & (2 * nelt - 1);
+	d->perm[i] ^= nelt; /* Keep the same index, but in the other vector.  */
 
       x = d->op0;
       d->op0 = d->op1;