[Mesa-dev] [PATCH 1/7] i965: Add low-level support for indirect sends

[Chris Forbes]

This provides a reasonable place to enforce the hardware restriction
that indirect descriptors must be in a0.0

Signed-off-by: Chris Forbes <chrisf at ijw.co.nz>
---
 src/mesa/drivers/dri/i965/brw_eu.h      |  5 +++++
 src/mesa/drivers/dri/i965/brw_eu_emit.c | 15 +++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_eu.h b/src/mesa/drivers/dri/i965/brw_eu.h
index 63cb20b..3858627 100644
--- a/src/mesa/drivers/dri/i965/brw_eu.h
+++ b/src/mesa/drivers/dri/i965/brw_eu.h
@@ -205,6 +205,11 @@ void brw_set_sampler_message(struct brw_compile *p,
                              unsigned simd_mode,
                              unsigned return_format);
 
+void brw_set_indirect_send_descriptor(struct brw_compile *p,
+                                      brw_inst *insn,
+                                      unsigned sfid,
+                                      struct brw_reg descriptor);
+
 void brw_set_dp_read_message(struct brw_compile *p,
 			     brw_inst *insn,
 			     unsigned binding_table_index,
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 12424bd..bc74de3 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -760,6 +760,21 @@ brw_set_sampler_message(struct brw_compile *p,
    }
 }
 
+void brw_set_indirect_send_descriptor(struct brw_compile *p,
+                                      brw_inst *insn,
+                                      unsigned sfid,
+                                      struct brw_reg descriptor)
+{
+   /* Only a0.0 may be used as SEND's descriptor operand. */
+   assert(descriptor.file == BRW_ARCHITECTURE_REGISTER_FILE);
+   assert(descriptor.type == BRW_REGISTER_TYPE_UD);
+   assert(descriptor.nr == BRW_ARF_ADDRESS);
+   assert(descriptor.subnr == 0);
+
+   brw_set_message_descriptor(p, insn, sfid, 0, 0, false, false);
+   brw_set_src1(p, insn, descriptor);
+}
+
 static void
 gen7_set_dp_scratch_message(struct brw_compile *p,
                             brw_inst *inst,
-- 
2.0.2