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 <[email protected]>
---
src/mesa/drivers/dri/i965/brw_vec4_emit.cpp | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
b/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
index dbe4dd0..917c927 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
@@ -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);
--
1.7.7.1
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