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nir/builder: Add a select_from_ssa_def_array helper

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This is an operation we have to do already for nir_vector_extract and
I'm about to do something very similar for matrix columns.  Having a
more generic helper is useful.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6479>
This commit is contained in:
Jason Ekstrand
2020-06-18 12:46:01 -05:00
committed by Marge Bot
parent 46cd91bb45
commit 07635a3284
1 changed files with 18 additions and 7 deletions
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src/compiler/nir/nir_builder.h
+18 -7
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@@ -644,19 +644,27 @@ nir_channels(nir_builder *b, nir_ssa_def *def, nir_component_mask_t mask)
}
static inline nir_ssa_def *
_nir_vector_extract_helper(nir_builder *b, nir_ssa_def *vec, nir_ssa_def *c,
unsigned start, unsigned end)
_nir_select_from_array_helper(nir_builder *b, nir_ssa_def **arr,
nir_ssa_def *idx,
unsigned start, unsigned end)
{
if (start == end - 1) {
return nir_channel(b, vec, start);
return arr[start];
} else {
unsigned mid = start + (end - start) / 2;
return nir_bcsel(b, nir_ilt(b, c, nir_imm_intN_t(b, mid, c->bit_size)),
_nir_vector_extract_helper(b, vec, c, start, mid),
_nir_vector_extract_helper(b, vec, c, mid, end));
return nir_bcsel(b, nir_ilt(b, idx, nir_imm_intN_t(b, mid, idx->bit_size)),
_nir_select_from_array_helper(b, arr, idx, start, mid),
_nir_select_from_array_helper(b, arr, idx, mid, end));
}
}
static inline nir_ssa_def *
nir_select_from_ssa_def_array(nir_builder *b, nir_ssa_def **arr,
unsigned arr_len, nir_ssa_def *idx)
{
return _nir_select_from_array_helper(b, arr, idx, 0, arr_len);
}
static inline nir_ssa_def *
nir_vector_extract(nir_builder *b, nir_ssa_def *vec, nir_ssa_def *c)
{
@@ -668,7 +676,10 @@ nir_vector_extract(nir_builder *b, nir_ssa_def *vec, nir_ssa_def *c)
else
return nir_ssa_undef(b, 1, vec->bit_size);
} else {
return _nir_vector_extract_helper(b, vec, c, 0, vec->num_components);
nir_ssa_def *comps[NIR_MAX_VEC_COMPONENTS];
for (unsigned i = 0; i < vec->num_components; i++)
comps[i] = nir_channel(b, vec, i);
return nir_select_from_ssa_def_array(b, comps, vec->num_components, c);
}
}