Mesa (master): i965/fs: Lower LOAD_PAYLOAD and clean up.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 138905d728fd1f4b38ff6a7137a5bbcac1d0875a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=138905d728fd1f4b38ff6a7137a5bbcac1d0875a

Author: Matt Turner <mattst88 at gmail.com>
Date:   Fri Apr 18 11:56:46 2014 -0700

i965/fs: Lower LOAD_PAYLOAD and clean up.

Clean up with with register_coalesce()/dead_code_eliminate().

---

 src/mesa/drivers/dri/i965/brw_fs.cpp |   38 ++++++++++++++++++++++++++++++++++
 src/mesa/drivers/dri/i965/brw_fs.h   |    1 +
 2 files changed, 39 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index fa00c11..62868d1 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2580,6 +2580,39 @@ fs_visitor::lower_uniform_pull_constant_loads()
    }
 }
 
+bool
+fs_visitor::lower_load_payload()
+{
+   bool progress = false;
+
+   foreach_list_safe(node, &instructions) {
+      fs_inst *inst = (fs_inst *)node;
+
+      if (inst->opcode == SHADER_OPCODE_LOAD_PAYLOAD) {
+         fs_reg dst = inst->dst;
+
+         /* src[0] represents the (optional) message header. */
+         if (inst->src[0].file != BAD_FILE) {
+            inst->insert_before(MOV(dst, inst->src[0]));
+         }
+         dst.reg_offset++;
+
+         for (int i = 1; i < inst->sources; i++) {
+            inst->insert_before(MOV(dst, inst->src[i]));
+            dst.reg_offset++;
+         }
+
+         inst->remove();
+         progress = true;
+      }
+   }
+
+   if (progress)
+      invalidate_live_intervals();
+
+   return progress;
+}
+
 void
 fs_visitor::dump_instructions()
 {
@@ -3078,6 +3111,11 @@ fs_visitor::run()
          OPT(compute_to_mrf);
       } while (progress);
 
+      if (lower_load_payload()) {
+         register_coalesce();
+         dead_code_eliminate();
+      }
+
       lower_uniform_pull_constant_loads();
 
       assign_curb_setup();
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index 4ce5fa3..885c186 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -391,6 +391,7 @@ public:
    void fail(const char *msg, ...);
    void no16(const char *msg, ...);
    void lower_uniform_pull_constant_loads();
+   bool lower_load_payload();
 
    void push_force_uncompressed();
    void pop_force_uncompressed();