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i965/vs: Use the sampler for VS pull constant loading on Ivybridge.

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Substantially increases performance in GLBenchmark PRO:
- 320x240   => 3.28x
- 1920x1080 => 1.47x
- 2560x1440 => 1.27x

The LD message ignores the sampler unit index and SAMPLER_STATE pointer,
instead relying on hard-wired default state.  Thus, there's no need to
worry about running out of sampler units or providing SAMPLER_STATE;
this small patch should be all that's required.

NOTE: This is a candidate for release branches.
      (It requires the preceding commit to compile.)

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke 2012-01-26 05:38:28 -08:00
parent 5f4575d42f
commit 259b65e2e7
1 changed files with 17 additions and 0 deletions
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17
src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
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@ -647,6 +647,23 @@ vec4_visitor::generate_pull_constant_load(vec4_instruction *inst,
struct brw_reg dst,
struct brw_reg index)
{
if (intel->gen == 7) {
gen6_resolve_implied_move(p, &index, inst->base_mrf);
brw_instruction *insn = brw_next_insn(p, BRW_OPCODE_SEND);
brw_set_dest(p, insn, dst);
brw_set_src0(p, insn, index);
brw_set_sampler_message(p, insn,
SURF_INDEX_VERT_CONST_BUFFER,
0, /* LD message ignores sampler unit */
GEN5_SAMPLER_MESSAGE_SAMPLE_LD,
1, /* rlen */
1, /* mlen */
false, /* no header */
BRW_SAMPLER_SIMD_MODE_SIMD4X2,
0);
return;
}
struct brw_reg header = brw_vec8_grf(0, 0);
gen6_resolve_implied_move(p, &header, inst->base_mrf);