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pco: Add debug variables for RA

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Adds force spilling control and optimal allocation disabling debug variables.

Signed-off-by: Radu Costas <radu.costas@imgtec.com>
Reviewed-by: Simon Perretta <simon.perretta@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/42078>
This commit is contained in:
Radu Costas 2026-05-28 15:54:08 +03:00 • committed by Marge Bot
parent 3add6b10a8
commit 0e76bb5000
4 changed files with 17 additions and 4 deletions
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6
docs/envvars.rst
View file

@ -2214,6 +2214,12 @@ PowerVR driver environment variables
``global_shmem``
Force spill shared memory to global memory.
``ra_force_spill``
Force spilling of temps during register allocation.
``ra_skip_opt``
Skip attempting to allocate temps with the optimal amount during RA.
.. envvar:: PCO_SKIP_PASSES
A comma-separated list of passes to skip.

10
src/imagination/pco/pco_debug.c
View file

@ -33,8 +33,14 @@ static const struct debug_named_value pco_debug_options[] = {
PCO_DEBUG_INT_SMP,
"Enable integer coordinate support for sampler instructions." },
{ "global_shmem",
PCO_DEBUG_GLOBAL_SHMEM,
"Force spill shared memory to global memory." },
PCO_DEBUG_GLOBAL_SHMEM,
"Force spill shared memory to global memory." },
{ "ra_force_spill",
PCO_DEBUG_RA_FORCE_SPILL,
"Force spilling of temps during register allocation." },
{ "ra_skip_opt",
PCO_DEBUG_RA_SKIP_OPT,
"Skip attempting to allocate temps with the optimal amount during RA." },
DEBUG_NAMED_VALUE_END,
};

2
src/imagination/pco/pco_internal.h
View file

@ -67,6 +67,8 @@ enum pco_debug {
PCO_DEBUG_ALLOC_EXTRA_VTXINS = BITFIELD64_BIT(3),
PCO_DEBUG_INT_SMP = BITFIELD64_BIT(4),
PCO_DEBUG_GLOBAL_SHMEM = BITFIELD64_BIT(5),
PCO_DEBUG_RA_FORCE_SPILL = BITFIELD64_BIT(6),
PCO_DEBUG_RA_SKIP_OPT = BITFIELD64_BIT(7),
};
extern uint64_t pco_debug;

3
src/imagination/pco/pco_ra.c
View file

@ -808,7 +808,7 @@ static bool pco_ra_func(pco_func *func, pco_ra_ctx *ctx)
}
bool allocated = ra_allocate(ra_graph);
bool force_spill = false;
bool force_spill = PCO_DEBUG(RA_FORCE_SPILL);
if (!allocated || force_spill) {
if (!ctx->spilling_setup) {
ctx->spill_inst_addr_comps[0] = pco_ref_hwreg(0, PCO_REG_CLASS_TEMP);
@ -1181,7 +1181,6 @@ bool pco_ra(pco_shader *shader)
shader->data.common.vtxins =
MAX2(shader->data.common.vtxins, func->vtxins);
}
shader->data.common.spilled_temps = ctx.spilled_temps;
return progress;
}