sna: Unroll finding bbox of points

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
index aff7b34..7be43c7 100644 (file)
--- a/src/sna/sna_accel.c
+++ b/src/sna/sna_accel.c
@@ -8271,10 +8271,33 @@ sna_poly_point_extents(DrawablePtr drawable, GCPtr gc,
                        box_add_pt(&box, last.x, last.y);
                }
        } else {
-               while (--n) {
-                       ++pt;
-                       box_add_pt(&box, pt->x, pt->y);
+               --n; ++pt;
+               while (n >= 8) {
+                       box_add_pt(&box, pt[0].x, pt[0].y);
+                       box_add_pt(&box, pt[1].x, pt[1].y);
+                       box_add_pt(&box, pt[2].x, pt[2].y);
+                       box_add_pt(&box, pt[3].x, pt[3].y);
+                       box_add_pt(&box, pt[4].x, pt[4].y);
+                       box_add_pt(&box, pt[5].x, pt[5].y);
+                       box_add_pt(&box, pt[6].x, pt[6].y);
+                       box_add_pt(&box, pt[7].x, pt[7].y);
+                       pt += 8;
+                       n -= 8;
+               }
+               if (n & 4) {
+                       box_add_pt(&box, pt[0].x, pt[0].y);
+                       box_add_pt(&box, pt[1].x, pt[1].y);
+                       box_add_pt(&box, pt[2].x, pt[2].y);
+                       box_add_pt(&box, pt[3].x, pt[3].y);
+                       pt += 4;
+               }
+               if (n & 2) {
+                       box_add_pt(&box, pt[0].x, pt[0].y);
+                       box_add_pt(&box, pt[1].x, pt[1].y);
+                       pt += 2;
                }
+               if (n & 1)
+                       box_add_pt(&box, pt[0].x, pt[0].y);
        }
        box.x2++;
        box.y2++;