Mesa (master): i965: Add a header_present flag for setting up dp read messages.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 78e9c57a3ec6930e818b83af960dcb40d09daa5a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=78e9c57a3ec6930e818b83af960dcb40d09daa5a

Author: Eric Anholt <eric at anholt.net>
Date:   Fri Nov  9 11:17:48 2012 -0800

i965: Add a header_present flag for setting up dp read messages.

As of gen7, we can skip the header on some messages, and this can make
optimization on those messages much nicer when you've got GRFs instead of MRFs
as the source.

---

 src/mesa/drivers/dri/i965/brw_eu.h          |    1 +
 src/mesa/drivers/dri/i965/brw_eu_emit.c     |    5 ++++-
 src/mesa/drivers/dri/i965/brw_vec4_emit.cpp |    2 ++
 3 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_eu.h b/src/mesa/drivers/dri/i965/brw_eu.h
index fce4f15..8c3a634 100644
--- a/src/mesa/drivers/dri/i965/brw_eu.h
+++ b/src/mesa/drivers/dri/i965/brw_eu.h
@@ -907,6 +907,7 @@ void brw_set_dp_read_message(struct brw_compile *p,
 			     GLuint msg_type,
 			     GLuint target_cache,
 			     GLuint msg_length,
+                             bool header_present,
 			     GLuint response_length);
 
 void brw_set_dp_write_message(struct brw_compile *p,
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 72fb5c5..8a629ff 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -620,6 +620,7 @@ brw_set_dp_read_message(struct brw_compile *p,
 			GLuint msg_type,
 			GLuint target_cache,
 			GLuint msg_length,
+                        bool header_present,
 			GLuint response_length)
 {
    struct brw_context *brw = p->brw;
@@ -638,7 +639,7 @@ brw_set_dp_read_message(struct brw_compile *p,
    }
 
    brw_set_message_descriptor(p, insn, sfid, msg_length, response_length,
-			      true, false);
+			      header_present, false);
 
    if (intel->gen >= 7) {
       insn->bits3.gen7_dp.binding_table_index = binding_table_index;
@@ -1967,6 +1968,7 @@ brw_oword_block_read_scratch(struct brw_compile *p,
 			      BRW_DATAPORT_READ_MESSAGE_OWORD_BLOCK_READ, /* msg_type */
 			      BRW_DATAPORT_READ_TARGET_RENDER_CACHE,
 			      1, /* msg_length */
+                              true, /* header_present */
 			      rlen);
    }
 }
@@ -2024,6 +2026,7 @@ void brw_oword_block_read(struct brw_compile *p,
 			   BRW_DATAPORT_READ_MESSAGE_OWORD_BLOCK_READ,
 			   BRW_DATAPORT_READ_TARGET_DATA_CACHE,
 			   1, /* msg_length */
+                           true, /* header_present */
 			   1); /* response_length (1 reg, 2 owords!) */
 
    brw_pop_insn_state(p);
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp b/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
index 5637b22..7609d92 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_emit.cpp
@@ -463,6 +463,7 @@ vec4_generator::generate_scratch_read(vec4_instruction *inst,
 			   msg_type,
 			   BRW_DATAPORT_READ_TARGET_RENDER_CACHE,
 			   2, /* mlen */
+                           true, /* header_present */
 			   1 /* rlen */);
 }
 
@@ -596,6 +597,7 @@ vec4_generator::generate_pull_constant_load(vec4_instruction *inst,
 			   msg_type,
 			   BRW_DATAPORT_READ_TARGET_DATA_CACHE,
 			   2, /* mlen */
+                           true, /* header_present */
 			   1 /* rlen */);
 }