Reviewed-by: Jason Ekstrand <ja...@jlekstrand.net> On Wed, Feb 28, 2018 at 5:38 AM, Jose Maria Casanova Crespo < jmcasan...@igalia.com> wrote:
> 16-bit load_ubo/ssbo operations that call do_untyped_read_vector don't > guarantee that offsets are multiple of 4-bytes as required by untyped_read > message. This happens for example in the case of f16mat3x3 when then > VK_KHR_relaxed_block_layout is enabled. > > Vectors reads when we have non-constant offsets are implemented with > multiple byte_scattered_read messages that not require 32-bit aligned > offsets. > > Now for all constant offsets we can use the untyped_read_surface message. > In the case of constant offsets not aligned to 32-bits, we calculate a > start offset 32-bit aligned and use the shuffle_32bit_load_result_to_ > 16bit_data > function and the first_component parameter to skip the copy of the unneeded > component. > > v2: (Jason Ekstrand) > Use untyped_read_surface messages always we have constant offsets. > > v3: (Jason Ekstrand) > Simplify loop for reads with non constant offsets. > Use end - start to calculate the number of 32-bit components to read > with > constant offsets. > --- > src/intel/compiler/brw_fs_nir.cpp | 51 ++++++++++++++++++++++++++++-- > --------- > 1 file changed, 37 insertions(+), 14 deletions(-) > > diff --git a/src/intel/compiler/brw_fs_nir.cpp > b/src/intel/compiler/brw_fs_nir.cpp > index 0d1ab5b01c..3f077b3c91 100644 > --- a/src/intel/compiler/brw_fs_nir.cpp > +++ b/src/intel/compiler/brw_fs_nir.cpp > @@ -2304,28 +2304,51 @@ do_untyped_vector_read(const fs_builder &bld, > { > if (type_sz(dest.type) <= 2) { > assert(dest.stride == 1); > + boolean is_const_offset = offset_reg.file == BRW_IMMEDIATE_VALUE; > > - if (num_components > 1) { > - /* Pairs of 16-bit components can be read with untyped read, for > 16-bit > - * vec3 4th component is ignored. > + if (is_const_offset) { > + uint32_t start = offset_reg.ud & ~3; > + uint32_t end = offset_reg.ud + num_components * > type_sz(dest.type); > + end = ALIGN(end, 4); > + assert (end - start <= 16); > + > + /* At this point we have 16-bit component/s that have constant > + * offset aligned to 4-bytes that can be read with untyped_reads. > + * untyped_read message requires 32-bit aligned offsets. > */ > + unsigned first_component = (offset_reg.ud & 3) / > type_sz(dest.type); > + unsigned num_components_32bit = (end - start) / 4; > + > fs_reg read_result = > - emit_untyped_read(bld, surf_index, offset_reg, > - 1 /* dims */, DIV_ROUND_UP(num_components, > 2), > + emit_untyped_read(bld, surf_index, brw_imm_ud(start), > + 1 /* dims */, > + num_components_32bit, > BRW_PREDICATE_NONE); > shuffle_32bit_load_result_to_16bit_data(bld, > retype(dest, BRW_REGISTER_TYPE_W), > retype(read_result, BRW_REGISTER_TYPE_D), > - 0, num_components); > + first_component, num_components); > } else { > - assert(num_components == 1); > - /* scalar 16-bit are read using one byte_scattered_read message > */ > - fs_reg read_result = > - emit_byte_scattered_read(bld, surf_index, offset_reg, > - 1 /* dims */, 1, > - type_sz(dest.type) * 8 /* bit_size > */, > - BRW_PREDICATE_NONE); > - bld.MOV(dest, subscript(read_result, dest.type, 0)); > + fs_reg read_offset = bld.vgrf(BRW_REGISTER_TYPE_UD); > + for (unsigned i = 0; i < num_components; i++) { > + if (i == 0) { > + bld.MOV(read_offset, offset_reg); > + } else { > + bld.ADD(read_offset, offset_reg, > + brw_imm_ud(i * type_sz(dest.type))); > + } > + /* Non constant offsets are not guaranteed to be aligned > 32-bits > + * so they are read using one byte_scattered_read message > + * for each component. > + */ > + fs_reg read_result = > + emit_byte_scattered_read(bld, surf_index, read_offset, > + 1 /* dims */, 1, > + type_sz(dest.type) * 8 /* > bit_size */, > + BRW_PREDICATE_NONE); > + bld.MOV(offset(dest, bld, i), > + subscript (read_result, dest.type, 0)); > + } > } > } else if (type_sz(dest.type) == 4) { > fs_reg read_result = emit_untyped_read(bld, surf_index, offset_reg, > -- > 2.16.1 > >
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