From: Jason Ekstrand Date: Wed, 8 Apr 2020 16:14:40 +0000 (-0500) Subject: spirv,nir: Add a better vector_insert X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c478f8ad6cf57425ffdae56a7c18b62b27985ea4;p=mesa.git spirv,nir: Add a better vector_insert The old one in spirv_to_nir was besel'ing the whole vector for every component. If we think about this as a vector operation, we can do it way more efficiently. Reviewed-by: Caio Marcelo de Oliveira Filho Part-of: --- diff --git a/src/compiler/spirv/spirv_to_nir.c b/src/compiler/spirv/spirv_to_nir.c index e0e8fdba27c..249b09b56ff 100644 --- a/src/compiler/spirv/spirv_to_nir.c +++ b/src/compiler/spirv/spirv_to_nir.c @@ -3341,12 +3341,6 @@ vtn_vector_insert(struct vtn_builder *b, nir_ssa_def *src, nir_ssa_def *insert, return &vec->dest.dest.ssa; } -static nir_ssa_def * -nir_ieq_imm(nir_builder *b, nir_ssa_def *x, uint64_t i) -{ - return nir_ieq(b, x, nir_imm_intN_t(b, i, x->bit_size)); -} - nir_ssa_def * vtn_vector_extract_dynamic(struct vtn_builder *b, nir_ssa_def *src, nir_ssa_def *index) @@ -3358,12 +3352,17 @@ nir_ssa_def * vtn_vector_insert_dynamic(struct vtn_builder *b, nir_ssa_def *src, nir_ssa_def *insert, nir_ssa_def *index) { - nir_ssa_def *dest = vtn_vector_insert(b, src, insert, 0); - for (unsigned i = 1; i < src->num_components; i++) - dest = nir_bcsel(&b->nb, nir_ieq_imm(&b->nb, index, i), - vtn_vector_insert(b, src, insert, i), dest); - - return dest; + nir_const_value per_comp_idx_const[NIR_MAX_VEC_COMPONENTS]; + for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++) + per_comp_idx_const[i] = nir_const_value_for_int(i, index->bit_size); + nir_ssa_def *per_comp_idx = + nir_build_imm(&b->nb, src->num_components, + index->bit_size, per_comp_idx_const); + + /* nir_builder will automatically splat out scalars to vectors so an insert + * is as simple as "if I'm the channel, replace me with the scalar." + */ + return nir_bcsel(&b->nb, nir_ieq(&b->nb, index, per_comp_idx), insert, src); } static nir_ssa_def *