Commit 7275b4b6 authored by Antonino A. Daplas's avatar Antonino A. Daplas Committed by Linus Torvalds
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[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: default avatarAntonino Daplas <adaplas@pol.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 39942fd8
......@@ -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? */
......
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