Searched hist:e90a4ea5 (Results 1 – 1 of 1) sorted by relevance
| /openbmc/linux/drivers/gpu/drm/udl/ |
| H A D | udl_transfer.c | e90a4ea5 Fri Jan 18 10:31:14 CST 2013 Chris Wilson <chris@chris-wilson.co.uk> drm/udl: Inline memcmp() for RLE compression of xfer
As we use a variable length the compiler does not realise that it is a
fixed value of either 2 or 4 bytes. Instead of performing the inline
comparison itself, the compiler inserts a function call to the generic
memcmp routine which is optimised for long comparisons of variable
length. That turns out to be quite expensive...
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
e90a4ea5 Fri Jan 18 10:31:14 CST 2013 Chris Wilson <chris@chris-wilson.co.uk> drm/udl: Inline memcmp() for RLE compression of xfer
As we use a variable length the compiler does not realise that it is a
fixed value of either 2 or 4 bytes. Instead of performing the inline
comparison itself, the compiler inserts a function call to the generic
memcmp routine which is optimised for long comparisons of variable
length. That turns out to be quite expensive...
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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