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i965/ir: Pass identity mask to brw_find_live_channel() in the packed dispatch case.

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This avoids emitting a few extra instructions required to take the
dispatch mask into account when it's known to be tightly packed.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Francisco Jerez 2016-09-15 17:24:10 -07:00
parent f57f526fc5
commit c05a4f11a0
2 changed files with 11 additions and 3 deletions
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5
src/mesa/drivers/dri/i965/brw_fs_generator.cpp
View file

@ -2045,7 +2045,10 @@ fs_generator::generate_code(const cfg_t *cfg, int dispatch_width)
case SHADER_OPCODE_FIND_LIVE_CHANNEL: {
const struct brw_reg mask =
stage == MESA_SHADER_FRAGMENT ? brw_vmask_reg() : brw_dmask_reg();
brw_stage_has_packed_dispatch(devinfo, stage,
prog_data) ? brw_imm_ud(~0u) :
stage == MESA_SHADER_FRAGMENT ? brw_vmask_reg() :
brw_dmask_reg();
brw_find_live_channel(p, dst, mask);
break;
}

9
src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
View file

@ -1862,9 +1862,14 @@ generate_code(struct brw_codegen *p,
brw_memory_fence(p, dst);
break;
case SHADER_OPCODE_FIND_LIVE_CHANNEL:
brw_find_live_channel(p, dst, brw_dmask_reg());
case SHADER_OPCODE_FIND_LIVE_CHANNEL: {
const struct brw_reg mask =
brw_stage_has_packed_dispatch(devinfo, nir->stage,
&prog_data->base) ? brw_imm_ud(~0u) :
brw_dmask_reg();
brw_find_live_channel(p, dst, mask);
break;
}
case SHADER_OPCODE_BROADCAST:
assert(inst->force_writemask_all);