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zink: fix store subsitution in lower_pv_mode_gs_store

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Previously it was assumed that between the and the variable there was
only one deref.

To handle all cases a new function is introduced that recreates a chain
of derefs.

Fixes: 5a4083349f ("zink: add provoking vertex mode lowering")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22678>
This commit is contained in:
antonino
2023-04-25 12:29:35 +02:00
committed by Marge Bot
parent a0645e3383
commit 39770c6503
1 changed files with 30 additions and 3 deletions
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33
src/gallium/drivers/zink/zink_compiler.c
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@@ -426,6 +426,31 @@ lower_pv_mode_gs_ring_index(nir_builder *b,
nir_imm_int(b, state->ring_size));
}
/* Given the final deref of chain of derefs this function will walk up the chain
* until it finds a var deref.
*
* It will then recreate an identical chain that ends with the provided deref.
*/
static nir_deref_instr*
replicate_derefs(nir_builder *b, nir_deref_instr *old, nir_deref_instr *new)
{
nir_deref_instr *parent = nir_src_as_deref(old->parent);
switch(old->deref_type) {
case nir_deref_type_var:
return new;
case nir_deref_type_array:
assert(old->arr.index.is_ssa);
return nir_build_deref_array(b, replicate_derefs(b, parent, new), old->arr.index.ssa);
case nir_deref_type_struct:
return nir_build_deref_struct(b, replicate_derefs(b, parent, new), old->strct.index);
case nir_deref_type_array_wildcard:
case nir_deref_type_ptr_as_array:
case nir_deref_type_cast:
unreachable("unexpected deref type");
}
unreachable("impossible deref type");
}
static bool
lower_pv_mode_gs_store(nir_builder *b,
nir_intrinsic_instr *intrin,
@@ -441,9 +466,11 @@ lower_pv_mode_gs_store(nir_builder *b,
assert(intrin->src[1].is_ssa);
nir_ssa_def *pos_counter = nir_load_var(b, state->pos_counter);
nir_ssa_def *index = lower_pv_mode_gs_ring_index(b, state, pos_counter);
nir_store_array_var(b, state->varyings[location],
index, intrin->src[1].ssa,
nir_intrinsic_write_mask(intrin));
nir_deref_instr *varying_deref = nir_build_deref_var(b, state->varyings[location]);
nir_deref_instr *ring_deref = nir_build_deref_array(b, varying_deref, index);
// recreate the chain of deref that lead to the store.
nir_deref_instr *new_top_deref = replicate_derefs(b, deref, ring_deref);
nir_store_deref(b, new_top_deref, intrin->src[1].ssa, nir_intrinsic_write_mask(intrin));
nir_instr_remove(&intrin->instr);
return true;
}