We need to SEND from a GRF, and we can only obtain those prior to
register allocation.
This allows us to do pull constant loads without the MRF hack.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index a036e2d..5f0d0b4 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -1582,7 +1582,13 @@ vec4_visitor::visit(ir_expression *ir)
src_reg surf_index =
src_reg(prog_data->base.binding_table.ubo_start +
uniform_block->value.u[0]);
if (const_offset_ir) {
- offset = src_reg(const_offset / 16);
+ if (brw->gen >= 8) {
+ /* Put the offset in a GRF; we can't SEND from immediates. */
+ offset = src_reg(this, glsl_type::int_type);
+ emit(MOV(dst_reg(offset), src_reg(const_offset / 16)));
+ } else {
+ offset = src_reg(const_offset / 16);
+ }
} else {
offset = src_reg(this, glsl_type::uint_type);
emit(SHR(dst_reg(offset), op[1], src_reg(4)));
@@ -2983,6 +2989,11 @@ vec4_visitor::get_pull_constant_offset(vec4_instruction
*inst,
}
return index;
+ } else if (brw->gen >= 8) {
+ /* Put the offset in a GRF; we can't SEND from immediates. */
+ src_reg offset = src_reg(this, glsl_type::int_type);
+ emit_before(inst, MOV(dst_reg(offset), src_reg(reg_offset)));
+ return offset;
} else {
int message_header_scale = brw->gen < 6 ? 16 : 1;
return src_reg(reg_offset * message_header_scale);
--
1.8.3.2
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