Hi Sam
Am 18.02.22 um 11:14 schrieb Sam Ravnborg:
Hi Thomas,
On Thu, Feb 17, 2022 at 11:34:05AM +0100, Thomas Zimmermann wrote:
Improve the performance of sys_imageblit() by manually unrolling
the inner blitting loop and moving some invariants out. The compiler
failed to do this
Hi Thomas,
On Thu, Feb 17, 2022 at 11:34:05AM +0100, Thomas Zimmermann wrote:
> Improve the performance of sys_imageblit() by manually unrolling
> the inner blitting loop and moving some invariants out. The compiler
> failed to do this automatically. The resulting binary code was even
> slower
Hello Thomas,
On 2/17/22 11:34, Thomas Zimmermann wrote:
> Improve the performance of sys_imageblit() by manually unrolling
> the inner blitting loop and moving some invariants out. The compiler
> failed to do this automatically. The resulting binary code was even
> slower than the
Hi
Am 17.02.22 um 12:05 schrieb Gerd Hoffmann:
- for (j = k; j--; ) {
- shift -= ppw;
- end_mask = tab[(*src >> shift) & bit_mask];
- *dst++ = (end_mask & eorx) ^ bgx;
- if (!shift) {
-
> - for (j = k; j--; ) {
> - shift -= ppw;
> - end_mask = tab[(*src >> shift) & bit_mask];
> - *dst++ = (end_mask & eorx) ^ bgx;
> - if (!shift) {
> - shift = 8;
> -
Improve the performance of sys_imageblit() by manually unrolling
the inner blitting loop and moving some invariants out. The compiler
failed to do this automatically. The resulting binary code was even
slower than the cfb_imageblit() helper, which uses the same algorithm,
but operates on I/O
