From: Antonino A. Daplas Date: Tue, 13 Dec 2005 06:17:20 +0000 (-0800) Subject: [PATCH] fbdev: Shift pixel value before entering loop in cfbimageblit X-Git-Tag: v2.6.15-rc6~79 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7275b4b6bc2f783c135c3f0eeecc4fdc6e788aa8;p=linux-2.6 [PATCH] fbdev: Shift pixel value before entering loop in cfbimageblit In slow imageblit, the pixel value is shifted by a certain amount (dependent on the bpp and endianness) for each iteration. This is inefficient. Better do the shifting once before going into the loop. Signed-off-by: Antonino Daplas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/video/cfbimgblt.c b/drivers/video/cfbimgblt.c index a7770c4f17..7a01742a82 100644 --- a/drivers/video/cfbimgblt.c +++ b/drivers/video/cfbimgblt.c @@ -162,6 +162,8 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info * u32 i, j, l; dst2 = (u32 __iomem *) dst1; + fgcolor <<= LEFT_POS(bpp); + bgcolor <<= LEFT_POS(bpp); for (i = image->height; i--; ) { shift = val = 0; @@ -180,7 +182,6 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info * while (j--) { l--; color = (*s & 1 << (BIT_NR(l))) ? fgcolor : bgcolor; - color <<= LEFT_POS(bpp); val |= SHIFT_HIGH(color, shift); /* Did the bitshift spill bits to the next long? */