[Mesa-dev] [PATCH 2/2] i965/tes/scalar: fix 64-bit indirect input loads
Timothy Arceri
timothy.arceri at collabora.com
Fri Jul 15 11:20:29 UTC 2016
On Fri, 2016-07-15 at 13:16 +0200, Iago Toral wrote:
> On Fri, 2016-07-15 at 20:59 +1000, Timothy Arceri wrote:
> > On Fri, 2016-07-15 at 11:04 +0200, Iago Toral Quiroga wrote:
> > >
> > > We totally ignored this before because there were no piglit tests
> > > for
> > > indirect loads in tessellation stages with doubles.
> > >
> > > Cc: "12.0" <mesa-stable at lists.freedesktop.org>
> > > ---
> > > src/mesa/drivers/dri/i965/brw_fs_nir.cpp | 86
> > > ++++++++++++++++++++++++--------
> > > 1 file changed, 64 insertions(+), 22 deletions(-)
> > >
> > > diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> > > b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> > > index 55383ff..7d5af78 100644
> > > --- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> > > +++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> > > @@ -2926,31 +2926,73 @@ fs_visitor::nir_emit_tes_intrinsic(const
> > > fs_builder &bld,
> > > }
> > > } else {
> > > /* Indirect indexing - use per-slot offsets as well. */
> > > - const fs_reg srcs[] = {
> > > - retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD),
> > > - indirect_offset
> > > - };
> > > - fs_reg payload = bld.vgrf(BRW_REGISTER_TYPE_UD, 2);
> > > - bld.LOAD_PAYLOAD(payload, srcs, ARRAY_SIZE(srcs), 0);
> > >
> > > - if (first_component != 0) {
> > > - unsigned read_components =
> > > - instr->num_components + first_component;
> > > - fs_reg tmp = bld.vgrf(dest.type, read_components);
> > > - inst =
> > > bld.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT,
> > > tmp,
> > > - payload);
> > > - inst->regs_written = read_components;
> > > - for (unsigned i = 0; i < instr->num_components; i++)
> > > {
> > > - bld.MOV(offset(dest, bld, i),
> > > - offset(tmp, bld, i + first_component));
> > > + /* We can only read two double components with each URB
> > > read, so
> > > + * we send two read messages in that case, each one
> > > loading
> > > up to
> > > + * two double components.
> > > + */
> > > + unsigned num_iterations = 1;
> > > + unsigned num_components = instr->num_components;
> > > + fs_reg orig_dest = dest;
> > > + if (type_sz(dest.type) == 8) {
> > Hi,
> >
> > Not your fault as its not currently enabled but can you add the
> > following here to allow component packing to work once it finally
> > gets
> > enabled:
> >
> > first_component = first_component / 2;
> >
> > I believe that should be enought to keep it working once the other
> > patches land.
>
> I think this is already being done in master, right after the
> assignment to first_component.
Oh yes you are right. All looks good to me then :)
>
> > Also I don't think this patch is going to apply cleanly to stable
> > as
> > the component packing cahnges only landed after branching.
> >
> > Thanks,
> > Tim
> >
> > >
> > > + if (instr->num_components > 2) {
> > > + num_iterations = 2;
> > > + num_components = 2;
> > > + }
> > > + fs_reg tmp = fs_reg(VGRF, alloc.allocate(4),
> > > dest.type);
> > > + dest = tmp;
> > > + }
> > > +
> > > + for (unsigned iter = 0; iter < num_iterations; iter++)
> > > {
> > > + const fs_reg srcs[] = {
> > > + retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD),
> > > + indirect_offset
> > > + };
> > > + fs_reg payload = bld.vgrf(BRW_REGISTER_TYPE_UD, 2);
> > > + bld.LOAD_PAYLOAD(payload, srcs, ARRAY_SIZE(srcs),
> > > 0);
> > > +
> > > + if (first_component != 0) {
> > > + unsigned read_components =
> > > + num_components + first_component;
> > > + fs_reg tmp = bld.vgrf(dest.type,
> > > read_components);
> > > + inst =
> > > bld.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT, tmp,
> > > + payload);
> > > + for (unsigned i = 0; i < num_components; i++) {
> > > + bld.MOV(offset(dest, bld, i),
> > > + offset(tmp, bld, i +
> > > first_component));
> > > + }
> > > + } else {
> > > + inst =
> > > bld.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT, dest,
> > > + payload);
> > > + }
> > > + inst->mlen = 2;
> > > + inst->offset = imm_offset;
> > > + inst->regs_written =
> > > + ((num_components + first_component) *
> > > type_sz(dest.type) / 4);
> > > +
> > > + /* If we are reading 64-bit data using 32-bit read
> > > messages we need
> > > + * build proper 64-bit data elements by shuffling
> > > the
> > > low and high
> > > + * 32-bit components around like we do for other
> > > things
> > > like UBOs
> > > + * or SSBOs.
> > > + */
> > > + if (type_sz(dest.type) == 8) {
> > > + shuffle_32bit_load_result_to_64bit_data(
> > > + bld, dest, retype(dest, BRW_REGISTER_TYPE_F),
> > > num_components);
> > > +
> > > + for (unsigned c = 0; c < num_components; c++) {
> > > + bld.MOV(offset(orig_dest, bld, iter * 2 + c),
> > > + offset(dest, bld, c));
> > > + }
> > > + }
> > > +
> > > + /* If we are loading double data and we need a
> > > second
> > > read message
> > > + * adjust the offset
> > > + */
> > > + if (num_iterations > 1) {
> > > + num_components = instr->num_components - 2;
> > > + imm_offset++;
> > > }
> > > - } else {
> > > - inst =
> > > bld.emit(SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT,
> > > dest,
> > > - payload);
> > > - inst->regs_written = instr->num_components;
> > > }
> > > - inst->mlen = 2;
> > > - inst->offset = imm_offset;
> > > }
> > > break;
> > > }
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