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u_upload_mgr: optimize u_upload_alloc 

This is probably the most called util function. It does almost nothing,
yet it can consume 10% of the CPU on the profile. This drops it down to 5%.

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Marek Olšák 2015-09-02 14:57:55 +02:00
parent 722ce74743
commit 6c1e368cf3
1 changed files with 17 additions and 15 deletions
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32
src/gallium/auxiliary/util/u_upload_mgr.c
View File

@ -186,37 +186,39 @@ enum pipe_error u_upload_alloc( struct u_upload_mgr *upload,
struct pipe_resource **outbuf,
void **ptr )
{
unsigned alloc_size = align( size, upload->alignment );
unsigned alloc_size = align(size, upload->alignment);
unsigned alloc_offset = align(min_out_offset, upload->alignment);
unsigned buffer_size = upload->buffer ? upload->buffer->width0 : 0;
unsigned offset;
/* Init these return values here in case we fail below to make
* sure the caller doesn't get garbage values.
*/
*out_offset = ~0;
pipe_resource_reference(outbuf, NULL);
*ptr = NULL;
/* Make sure we have enough space in the upload buffer
* for the sub-allocation. */
if (!upload->buffer ||
MAX2(upload->offset, alloc_offset) + alloc_size > upload->buffer->width0) {
if (unlikely(MAX2(upload->offset, alloc_offset) + alloc_size > buffer_size)) {
enum pipe_error ret = u_upload_alloc_buffer(upload,
alloc_offset + alloc_size);
if (ret != PIPE_OK)
if (unlikely(ret != PIPE_OK)) {
*out_offset = ~0;
pipe_resource_reference(outbuf, NULL);
*ptr = NULL;
return ret;
}
buffer_size = upload->buffer->width0;
}
offset = MAX2(upload->offset, alloc_offset);
if (!upload->map) {
if (unlikely(!upload->map)) {
upload->map = pipe_buffer_map_range(upload->pipe, upload->buffer,
offset,
upload->buffer->width0 - offset,
buffer_size - offset,
upload->map_flags,
&upload->transfer);
if (!upload->map) {
if (unlikely(!upload->map)) {
upload->transfer = NULL;
*out_offset = ~0;
pipe_resource_reference(outbuf, NULL);
*ptr = NULL;
return PIPE_ERROR_OUT_OF_MEMORY;
}
@ -229,7 +231,7 @@ enum pipe_error u_upload_alloc( struct u_upload_mgr *upload,
/* Emit the return values: */
*ptr = upload->map + offset;
pipe_resource_reference( outbuf, upload->buffer );
pipe_resource_reference(outbuf, upload->buffer);
*out_offset = offset;
upload->offset = offset + alloc_size;