Mesa (master): i965: Add AccWrCtl support on Sandybridge.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 93ba0055c325007656c14ba38302e21be3dc599f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=93ba0055c325007656c14ba38302e21be3dc599f

Author: Zhenyu Wang <zhenyuw at linux.intel.com>
Date:   Fri Aug 20 14:37:19 2010 -0700

i965: Add AccWrCtl support on Sandybridge.

Whenever the accumulator results are needed, this bit must be set.

---

 src/mesa/drivers/dri/i965/brw_disasm.c  |    7 +++++++
 src/mesa/drivers/dri/i965/brw_eu.c      |    6 ++++++
 src/mesa/drivers/dri/i965/brw_eu.h      |    1 +
 src/mesa/drivers/dri/i965/brw_structs.h |    5 +++--
 src/mesa/drivers/dri/i965/brw_vs_emit.c |    3 +++
 5 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_disasm.c b/src/mesa/drivers/dri/i965/brw_disasm.c
index 5e5db32..b546380 100644
--- a/src/mesa/drivers/dri/i965/brw_disasm.c
+++ b/src/mesa/drivers/dri/i965/brw_disasm.c
@@ -159,6 +159,11 @@ char *saturate[2] = {
     [1] = ".sat"
 };
 
+char *accwr[2] = {
+    [0] = "",
+    [1] = "AccWrEnable"
+};
+
 char *exec_size[8] = {
     [0] = "1",
     [1] = "2",
@@ -993,6 +998,8 @@ int brw_disasm (FILE *file, struct brw_instruction *inst, int gen)
 			   inst->header.compression_control, &space);
 	}
 	err |= control (file, "thread control", thread_ctrl, inst->header.thread_control, &space);
+	if (gen >= 6)
+	    err |= control (file, "acc write control", accwr, inst->header.acc_wr_control, &space);
 	if (inst->header.opcode == BRW_OPCODE_SEND)
 	    err |= control (file, "end of thread", end_of_thread,
 			    inst->bits3.generic.end_of_thread, &space);
diff --git a/src/mesa/drivers/dri/i965/brw_eu.c b/src/mesa/drivers/dri/i965/brw_eu.c
index 4e7c122..2ff39e8 100644
--- a/src/mesa/drivers/dri/i965/brw_eu.c
+++ b/src/mesa/drivers/dri/i965/brw_eu.c
@@ -85,6 +85,12 @@ void brw_set_saturate( struct brw_compile *p, GLuint value )
    p->current->header.saturate = value;
 }
 
+void brw_set_acc_write_control(struct brw_compile *p, GLuint value)
+{
+   if (p->brw->intel.gen >= 6)
+      p->current->header.acc_wr_control = value;
+}
+
 void brw_push_insn_state( struct brw_compile *p )
 {
    assert(p->current != &p->stack[BRW_EU_MAX_INSN_STACK-1]);
diff --git a/src/mesa/drivers/dri/i965/brw_eu.h b/src/mesa/drivers/dri/i965/brw_eu.h
index d15a8f9..1ead445 100644
--- a/src/mesa/drivers/dri/i965/brw_eu.h
+++ b/src/mesa/drivers/dri/i965/brw_eu.h
@@ -770,6 +770,7 @@ void brw_set_compression_control( struct brw_compile *p, GLboolean control );
 void brw_set_predicate_control_flag_value( struct brw_compile *p, GLuint value );
 void brw_set_predicate_control( struct brw_compile *p, GLuint pc );
 void brw_set_conditionalmod( struct brw_compile *p, GLuint conditional );
+void brw_set_acc_write_control(struct brw_compile *p, GLuint value);
 
 void brw_init_compile( struct brw_context *, struct brw_compile *p );
 const GLuint *brw_get_program( struct brw_compile *p, GLuint *sz );
diff --git a/src/mesa/drivers/dri/i965/brw_structs.h b/src/mesa/drivers/dri/i965/brw_structs.h
index 2fde42a..1d6018f 100644
--- a/src/mesa/drivers/dri/i965/brw_structs.h
+++ b/src/mesa/drivers/dri/i965/brw_structs.h
@@ -1305,13 +1305,14 @@ struct brw_instruction
       GLuint access_mode:1;
       GLuint mask_control:1;
       GLuint dependency_control:2;
-      GLuint compression_control:2;
+      GLuint compression_control:2; /* gen6: quater control */
       GLuint thread_control:2;
       GLuint predicate_control:4;
       GLuint predicate_inverse:1;
       GLuint execution_size:3;
       GLuint destreg__conditionalmod:4; /* destreg - send, conditionalmod - others */
-      GLuint pad0:2;
+      GLuint acc_wr_control:1;
+      GLuint cmpt_control:1;
       GLuint debug_control:1;
       GLuint saturate:1;
    } header;
diff --git a/src/mesa/drivers/dri/i965/brw_vs_emit.c b/src/mesa/drivers/dri/i965/brw_vs_emit.c
index 18eb845..2f4653f 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_emit.c
@@ -1397,6 +1397,7 @@ static void emit_vertex_write( struct brw_vs_compile *c)
     * of zeros followed by two sets of NDC coordinates:
     */
    brw_set_access_mode(p, BRW_ALIGN_1);
+   brw_set_acc_write_control(p, 0);
 
    /* The VUE layout is documented in Volume 2a. */
    if (intel->gen >= 6) {
@@ -1578,6 +1579,8 @@ void brw_vs_emit(struct brw_vs_compile *c )
    brw_set_access_mode(p, BRW_ALIGN_16);
    if_depth_in_loop[loop_depth] = 0;
 
+   brw_set_acc_write_control(p, 1);
+
    for (insn = 0; insn < nr_insns; insn++) {
        GLuint i;
        struct prog_instruction *inst = &c->vp->program.Base.Instructions[insn];