[arm-simd] Add a comment about aligning source and destination pointers.

1 files changed, 2 insertions, 0 deletions

diff --git a/pixman/pixman-arm-simd.c b/pixman/pixman-arm-simd.c
index f595325..ceef1a8 100644
--- a/pixman/pixman-arm-simd.c
+++ b/pixman/pixman-arm-simd.c
@@ -60,6 +60,8 @@ fbCompositeSrcAdd_8000x8000arm (pixman_op_t op,
 	srcLine += srcStride;
 	w = width;
 
+        /* ensure both src and dst are properly aligned before doing 32 bit reads
+         * we'll stay in this loop if src and dst have differing alignments */
 	while (w && (((unsigned long)dst & 3) || ((unsigned long)src & 3)))
 	{
 	    s = *src;