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intel/brw: Document UBO_START

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Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39175>
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José Roberto de Souza 2025-12-30 12:03:29 -08:00 • committed by Marge Bot
parent 961ca451e0
commit 0cc73385e6
1 changed files with 12 additions and 0 deletions
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12
src/intel/compiler/brw/brw_shader.h
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@ -35,6 +35,18 @@
#include "brw_analysis.h"
#include "brw_thread_payload.h"
/* UBO_START is a pseudo-register number that must be greater than the maximum
* number of physical hardware registers.
* It is used in earlier compiler stages as a source for instructions where
* nir_intrinsic_load_ubo has been promoted to push constants.
* At those stages, the exact location of the push constant data in the thread
* payload is not yet known.
*
* Later, in brw_shader::assign_curb_setup(), once this location is determined,
* the compiler checks if a register number is greater than or equal to UBO_START.
* If it is, the compiler calculates the actual hardware register where the push
* constant data will be loaded and update the instruction.
*/
#define UBO_START ((1 << 16) - 4)
struct brw_shader_stats {