[Mesa-dev] [PATCH 11/19] i965/fs: Use LOAD_PAYLOAD in emit_texture_gen7().
Kenneth Graunke
kenneth at whitecape.org
Wed Apr 23 23:19:23 PDT 2014
On 04/18/2014 11:56 AM, Matt Turner wrote:
> ---
> src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 135 +++++++++++++++------------
> 1 file changed, 73 insertions(+), 62 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
> index 2aa3acd..91bbe0a 100644
> --- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
> @@ -1257,8 +1257,11 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
> int reg_width = dispatch_width / 8;
> bool header_present = false;
>
> - fs_reg payload = fs_reg(this, glsl_type::float_type);
> - fs_reg next = payload;
> + fs_reg *sources = ralloc_array(mem_ctx, fs_reg, MAX_SAMPLER_MESSAGE_SIZE);
> + for (int i = 0; i < MAX_SAMPLER_MESSAGE_SIZE; i++) {
> + sources[i] = fs_reg(this, glsl_type::float_type);
> + }
> + int length = 0;
>
> if (ir->op == ir_tg4 || (ir->offset && ir->op != ir_txf) || sampler >= 16) {
> /* For general texture offsets (no txf workaround), we need a header to
> @@ -1272,12 +1275,13 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
> * need to offset the Sampler State Pointer in the header.
> */
> header_present = true;
> - next.reg_offset++;
> + sources[length] = reg_undef;
> + length++;
> }
So...if you don't take the header_present = true path...then it looks
like the next thing (say, shadow_c) will land in sources[0], rather than
leaving sources[0] as BAD_FILE and putting the first part of the payload
in sources[1].
Is sources[0] special and reserved for the header or isn't it?
>
> if (ir->shadow_comparitor) {
> - emit(MOV(next, shadow_c));
> - next.reg_offset++;
> + emit(MOV(sources[length], shadow_c));
I'm confused by the fact that these MOVs are still here. I would have
expected:
sources[length] = sample_c;
When we visit expression trees, we generate results into various
registers. The point of these MOVs is to put them into a large-VGRF we
can SEND from, at the right ref_offset.
Now, you have a new set of MAX_SAMPLER_MESSAGE_SIZE registers, and copy
from the original registers to these new temporaries, then LOAD_PAYLOAD
does a second copy from those into the new ones. It seems like we could
just use the original registers and do a single copy.
I'm probably missing something here, but I can't think of what.
> + length++;
> }
>
> bool has_nonconstant_offset = ir->offset && !ir->offset->as_constant();
> @@ -1289,12 +1293,12 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
> case ir_lod:
> break;
> case ir_txb:
> - emit(MOV(next, lod));
> - next.reg_offset++;
> + emit(MOV(sources[length], lod));
> + length++;
> break;
> case ir_txl:
> - emit(MOV(next, lod));
> - next.reg_offset++;
> + emit(MOV(sources[length], lod));
> + length++;
> break;
> case ir_txd: {
> no16("Gen7 does not support sample_d/sample_d_c in SIMD16 mode.");
> @@ -1303,21 +1307,21 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
> * [hdr], [ref], x, dPdx.x, dPdy.x, y, dPdx.y, dPdy.y, z, dPdx.z, dPdy.z
> */
> for (int i = 0; i < ir->coordinate->type->vector_elements; i++) {
> - emit(MOV(next, coordinate));
> + emit(MOV(sources[length], coordinate));
> coordinate.reg_offset++;
> - next.reg_offset++;
> + length++;
>
> /* For cube map array, the coordinate is (u,v,r,ai) but there are
> * only derivatives for (u, v, r).
> */
> if (i < ir->lod_info.grad.dPdx->type->vector_elements) {
> - emit(MOV(next, lod));
> + emit(MOV(sources[length], lod));
> lod.reg_offset++;
> - next.reg_offset++;
> + length++;
>
> - emit(MOV(next, lod2));
> + emit(MOV(sources[length], lod2));
> lod2.reg_offset++;
> - next.reg_offset++;
> + length++;
> }
> }
>
> @@ -1325,45 +1329,45 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
> break;
> }
> case ir_txs:
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_UD), lod));
> - next.reg_offset++;
> + emit(MOV(retype(sources[length], BRW_REGISTER_TYPE_UD), lod));
> + length++;
> break;
> case ir_query_levels:
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_UD), fs_reg(0u)));
> - next.reg_offset++;
> + emit(MOV(retype(sources[length], BRW_REGISTER_TYPE_UD), fs_reg(0u)));
> + length++;
> break;
> case ir_txf:
> /* Unfortunately, the parameters for LD are intermixed: u, lod, v, r. */
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_D), coordinate));
> + emit(MOV(retype(sources[length], BRW_REGISTER_TYPE_D), coordinate));
> coordinate.reg_offset++;
> - next.reg_offset++;
> + length++;
>
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_D), lod));
> - next.reg_offset++;
> + emit(MOV(retype(sources[length], BRW_REGISTER_TYPE_D), lod));
> + length++;
>
> for (int i = 1; i < ir->coordinate->type->vector_elements; i++) {
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_D), coordinate));
> + emit(MOV(retype(sources[length], BRW_REGISTER_TYPE_D), coordinate));
> coordinate.reg_offset++;
> - next.reg_offset++;
> + length++;
> }
>
> coordinate_done = true;
> break;
> case ir_txf_ms:
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_UD), sample_index));
> - next.reg_offset++;
> + emit(MOV(retype(sources[length], BRW_REGISTER_TYPE_UD), sample_index));
> + length++;
>
> /* data from the multisample control surface */
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_UD), mcs));
> - next.reg_offset++;
> + emit(MOV(retype(sources[length], BRW_REGISTER_TYPE_UD), mcs));
> + length++;
>
> /* there is no offsetting for this message; just copy in the integer
> * texture coordinates
> */
> for (int i = 0; i < ir->coordinate->type->vector_elements; i++) {
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_D), coordinate));
> + emit(MOV(retype(sources[length], BRW_REGISTER_TYPE_D), coordinate));
> coordinate.reg_offset++;
> - next.reg_offset++;
> + length++;
> }
>
> coordinate_done = true;
> @@ -1378,21 +1382,21 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
> fs_reg offset_value = this->result;
>
> for (int i = 0; i < 2; i++) { /* u, v */
> - emit(MOV(next, coordinate));
> + emit(MOV(sources[length], coordinate));
> coordinate.reg_offset++;
> - next.reg_offset++;
> + length++;
> }
>
> for (int i = 0; i < 2; i++) { /* offu, offv */
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_D), offset_value));
> + emit(MOV(retype(sources[length], BRW_REGISTER_TYPE_D), offset_value));
> offset_value.reg_offset++;
> - next.reg_offset++;
> + length++;
> }
>
> if (ir->coordinate->type->vector_elements == 3) { /* r if present */
> - emit(MOV(next, coordinate));
> + emit(MOV(sources[length], coordinate));
> coordinate.reg_offset++;
> - next.reg_offset++;
> + length++;
> }
>
> coordinate_done = true;
> @@ -1403,40 +1407,44 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
> /* Set up the coordinate (except for cases where it was done above) */
> if (ir->coordinate && !coordinate_done) {
> for (int i = 0; i < ir->coordinate->type->vector_elements; i++) {
> - emit(MOV(next, coordinate));
> + emit(MOV(sources[length], coordinate));
> coordinate.reg_offset++;
> - next.reg_offset++;
> + length++;
> }
> }
>
> + fs_reg src_payload = fs_reg(this, glsl_type::float_type);
> + virtual_grf_sizes[src_payload.reg] = length;
> + emit(SHADER_OPCODE_LOAD_PAYLOAD, src_payload, sources, length);
> +
I think I would prefer to see this called "payload", "msg_payload" or
simply "message". There are enough things called src/sources/...
Perhaps also use the virtual_grf_alloc paradigm, as you do in
emit_mcs_fetch? i.e.
fs_reg msg_payload(GRF, virtual_grf_alloc(length), BRW_REGISTER_TYPE_F);
> /* Generate the SEND */
> - fs_inst *inst = NULL;
> + enum opcode opcode;
> switch (ir->op) {
> - case ir_tex: inst = emit(SHADER_OPCODE_TEX, dst, payload); break;
> - case ir_txb: inst = emit(FS_OPCODE_TXB, dst, payload); break;
> - case ir_txl: inst = emit(SHADER_OPCODE_TXL, dst, payload); break;
> - case ir_txd: inst = emit(SHADER_OPCODE_TXD, dst, payload); break;
> - case ir_txf: inst = emit(SHADER_OPCODE_TXF, dst, payload); break;
> - case ir_txf_ms: inst = emit(SHADER_OPCODE_TXF_CMS, dst, payload); break;
> - case ir_txs: inst = emit(SHADER_OPCODE_TXS, dst, payload); break;
> - case ir_query_levels: inst = emit(SHADER_OPCODE_TXS, dst, payload); break;
> - case ir_lod: inst = emit(SHADER_OPCODE_LOD, dst, payload); break;
> + case ir_tex: opcode = SHADER_OPCODE_TEX; break;
> + case ir_txb: opcode = FS_OPCODE_TXB; break;
> + case ir_txl: opcode = SHADER_OPCODE_TXL; break;
> + case ir_txd: opcode = SHADER_OPCODE_TXD; break;
> + case ir_txf: opcode = SHADER_OPCODE_TXF; break;
> + case ir_txf_ms: opcode = SHADER_OPCODE_TXF_CMS; break;
> + case ir_txs: opcode = SHADER_OPCODE_TXS; break;
> + case ir_query_levels: opcode = SHADER_OPCODE_TXS; break;
> + case ir_lod: opcode = SHADER_OPCODE_LOD; break;
> case ir_tg4:
> if (has_nonconstant_offset)
> - inst = emit(SHADER_OPCODE_TG4_OFFSET, dst, payload);
> + opcode = SHADER_OPCODE_TG4_OFFSET;
> else
> - inst = emit(SHADER_OPCODE_TG4, dst, payload);
> + opcode = SHADER_OPCODE_TG4;
> break;
> }
> + fs_inst *inst = emit(opcode, dst, src_payload);
> inst->base_mrf = -1;
> if (reg_width == 2)
> - inst->mlen = next.reg_offset * reg_width - header_present;
> + inst->mlen = length * reg_width - header_present;
> else
> - inst->mlen = next.reg_offset * reg_width;
> + inst->mlen = length * reg_width;
> inst->header_present = header_present;
> inst->regs_written = 4;
>
> - virtual_grf_sizes[payload.reg] = next.reg_offset;
> if (inst->mlen > MAX_SAMPLER_MESSAGE_SIZE) {
> fail("Message length >" STRINGIFY(MAX_SAMPLER_MESSAGE_SIZE)
> " disallowed by hardware\n");
> @@ -1551,21 +1559,24 @@ fs_reg
> fs_visitor::emit_mcs_fetch(ir_texture *ir, fs_reg coordinate, int sampler)
> {
> int reg_width = dispatch_width / 8;
> - fs_reg payload = fs_reg(this, glsl_type::float_type);
> + int length = ir->coordinate->type->vector_elements;
> + fs_reg payload = fs_reg(GRF, virtual_grf_alloc(length),
> + BRW_REGISTER_TYPE_F);
FWIW, in C++, you don't need to do
fs_reg name = fs_reg(...);
you can just do:
fs_reg name(...);
Hopefully the compiler is smart enough not to construct an fs_reg with
the default constructor, destruct it, and assign over it using the
assignment operator...but I don't know that it is.
It's also just a bit shorter.
> fs_reg dest = fs_reg(this, glsl_type::uvec4_type);
> - fs_reg next = payload;
> + fs_reg *sources = ralloc_array(mem_ctx, fs_reg, length);
>
> - /* parameters are: u, v, r, lod; missing parameters are treated as zero */
> - for (int i = 0; i < ir->coordinate->type->vector_elements; i++) {
> - emit(MOV(retype(next, BRW_REGISTER_TYPE_D), coordinate));
> + /* parameters are: u, v, r; missing parameters are treated as zero */
> + for (int i = 0; i < length; i++) {
> + sources[i] = fs_reg(this, glsl_type::float_type);
> + emit(MOV(retype(sources[i], BRW_REGISTER_TYPE_D), coordinate));
> coordinate.reg_offset++;
> - next.reg_offset++;
> }
>
> + emit(SHADER_OPCODE_LOAD_PAYLOAD, payload, sources, length);
> +
> fs_inst *inst = emit(SHADER_OPCODE_TXF_MCS, dest, payload);
> - virtual_grf_sizes[payload.reg] = next.reg_offset;
> inst->base_mrf = -1;
> - inst->mlen = next.reg_offset * reg_width;
> + inst->mlen = length * reg_width;
> inst->header_present = false;
> inst->regs_written = 4 * reg_width; /* we only care about one reg of response,
> * but the sampler always writes 4/8
>
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