[src/trunk]: src/sys/dev/rasops Simplify logic and tiny clean-up.

[rin <rin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2826caca070b
branches:  trunk
changeset: 462096:2826caca070b
user:      rin <rin%NetBSD.org@localhost>
date:      Wed Jul 24 18:49:37 2019 +0000

description:
Simplify logic and tiny clean-up.

diffstat:

 sys/dev/rasops/rasops.c |  102 ++++++++++++++++++-----------------------------
 1 files changed, 40 insertions(+), 62 deletions(-)

diffs (147 lines):

diff -r d1837235f219 -r 2826caca070b sys/dev/rasops/rasops.c
--- a/sys/dev/rasops/rasops.c   Wed Jul 24 18:40:01 2019 +0000
+++ b/sys/dev/rasops/rasops.c   Wed Jul 24 18:49:37 2019 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: rasops.c,v 1.83 2019/07/24 18:40:01 rin Exp $ */
+/*      $NetBSD: rasops.c,v 1.84 2019/07/24 18:49:37 rin Exp $ */
 
 /*-
  * Copyright (c) 1999 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rasops.c,v 1.83 2019/07/24 18:40:01 rin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rasops.c,v 1.84 2019/07/24 18:49:37 rin Exp $");
 
 #include "opt_rasops.h"
 #include "rasops_glue.h"
@@ -994,7 +994,9 @@
 static void
 rasops_do_cursor(struct rasops_info *ri)
 {
-       int full1, height, cnt, slop1, slop2, row, col;
+       int full, height, cnt, slop1, slop2, row, col;
+       uint32_t tmp32, msk;
+       uint8_t tmp8;
        uint8_t *dp, *rp, *hrp, *hp;
 
        hrp = hp = NULL;
@@ -1034,7 +1036,7 @@
         */
        if (ri->ri_xscale == 1) {
                while (height--) {
-                       uint8_t tmp8 = ~*rp;
+                       tmp8 = ~*rp;
 
                        *rp = tmp8;
                        rp += ri->ri_stride;
@@ -1051,74 +1053,50 @@
         * For ri_xscale = 2, 3, 4, ...:
         *
         * Note that siop1 <= ri_xscale even for ri_xscale = 2,
-        * since rp % 3 = 0 or 2.
+        * since rp % 3 = 0 or 2 (ri_stride % 4 = 0).
         */
        slop1 = (4 - ((uintptr_t)rp & 3)) & 3;
        slop2 = (ri->ri_xscale - slop1) & 3;
-       full1 = (ri->ri_xscale - slop1 - slop2) >> 2;
+       full = (ri->ri_xscale - slop1 - slop2) >> 2;
+
+       rp = (uint8_t *)((uintptr_t)rp & ~3);
+       hrp = (uint8_t *)((uintptr_t)hrp & ~3);
 
-       if ((slop1 | slop2) == 0) {
-               uint32_t tmp32;
-               /* A common case */
-               while (height--) {
-                       dp = rp;
-                       rp += ri->ri_stride;
+       while (height--) {
+               dp = rp;
+               rp += ri->ri_stride;
+               if (ri->ri_hwbits) {
+                       hp = hrp;
+                       hrp += ri->ri_stride;
+               }
+
+               if (slop1) {
+                       msk = be32toh(0xffffffffU >> (32 - (8 * slop1)));
+                       tmp32 = *(uint32_t *)dp ^ msk;
+                       *(uint32_t *)dp = tmp32;
+                       dp += 4;
                        if (ri->ri_hwbits) {
-                               hp = hrp;
-                               hrp += ri->ri_stride;
-                       }
-
-                       for (cnt = full1; cnt; cnt--) {
-                               tmp32 = *(uint32_t *)dp ^ ~0;
-                               *(uint32_t *)dp = tmp32;
-                               dp += 4;
-                               if (ri->ri_hwbits) {
-                                       *(uint32_t *)hp = tmp32;
-                                       hp += 4;
-                               }
+                               *(uint32_t *)hp = tmp32;
+                               hp += 4;
                        }
                }
-       } else {
-               uint32_t tmp32, msk1, msk2;
-
-               while (height--) {
-                       dp = (uint8_t *)((uintptr_t)rp & ~3);
-                       rp += ri->ri_stride;
-                       if (ri->ri_hwbits) {
-                               hp = (uint8_t *)((uintptr_t)hrp & ~3);
-                               hrp += ri->ri_stride;
-                       }
 
-                       if (slop1) {
-                               msk1 =
-                                   be32toh(0xffffffff >> (32 - (8 * slop1)));
-                               tmp32 = *(uint32_t *)dp ^ msk1;
-                               *(uint32_t *)dp = tmp32;
-                               dp += 4;
-                               if (ri->ri_hwbits) {
-                                       *(uint32_t *)hp = tmp32;
-                                       hp += 4;
-                               }
+               for (cnt = full; cnt; cnt--) {
+                       tmp32 = ~*(uint32_t *)dp;
+                       *(uint32_t *)dp = tmp32;
+                       dp += 4;
+                       if (ri->ri_hwbits) {
+                               *(uint32_t *)hp = tmp32;
+                               hp += 4;
                        }
+               }
 
-                       for (cnt = full1; cnt; cnt--) {
-                               tmp32 = *(uint32_t *)dp ^ ~0;
-                               *(uint32_t *)dp = tmp32;
-                               dp += 4;
-                               if (ri->ri_hwbits) {
-                                       *(uint32_t *)hp = tmp32;
-                                       hp += 4;
-                               }
-                       }
-
-                       if (slop2) {
-                               msk2 =
-                                   be32toh(0xffffffff << (32 - (8 * slop2)));
-                               tmp32 = *(uint32_t *)dp ^ msk2;
-                               *(uint32_t *)dp = tmp32;
-                               if (ri->ri_hwbits)
-                                       *(uint32_t *)hp = tmp32;
-                       }
+               if (slop2) {
+                       msk = be32toh(0xffffffffU << (32 - (8 * slop2)));
+                       tmp32 = *(uint32_t *)dp ^ msk;
+                       *(uint32_t *)dp = tmp32;
+                       if (ri->ri_hwbits)
+                               *(uint32_t *)hp = tmp32;
                }
        }
 }