Mesa (master): i965/fs: Show register pressure in dump_instructions() output.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 391eaa59bd2b71078a28ff34dd3d4eed470653ee
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=391eaa59bd2b71078a28ff34dd3d4eed470653ee

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Sun Aug  4 23:34:01 2013 -0700

i965/fs: Show register pressure in dump_instructions() output.

Dumping the number of live registers at each IP allows us to see
register pressure and identify any local maxima.  This should
aid in debugging passes designed to reduce register pressure, as
well as optimizations that suddenly trigger spilling.

Reviewed-by: Matt Turner <mattst88 at gmail.com>
Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>

---

 src/mesa/drivers/dri/i965/brw_fs.cpp   |   14 ++++++++++++++
 src/mesa/drivers/dri/i965/brw_fs.h     |    1 +
 src/mesa/drivers/dri/i965/brw_shader.h |    2 +-
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 4766a8a..181a939 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2942,6 +2942,20 @@ fs_visitor::lower_uniform_pull_constant_loads()
 }
 
 void
+fs_visitor::dump_instructions()
+{
+   calculate_register_pressure();
+
+   int ip = 0;
+   foreach_list(node, &this->instructions) {
+      backend_instruction *inst = (backend_instruction *)node;
+      printf("{%3d} %4d: ", regs_live_at_ip[ip], ip);
+      dump_instruction(inst);
+      ++ip;
+   }
+}
+
+void
 fs_visitor::dump_instruction(backend_instruction *be_inst)
 {
    fs_inst *inst = (fs_inst *)be_inst;
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index f064886..f493784 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -432,6 +432,7 @@ public:
    void setup_builtin_uniform_values(ir_variable *ir);
    int implied_mrf_writes(fs_inst *inst);
 
+   virtual void dump_instructions();
    void dump_instruction(backend_instruction *inst);
 
    void visit_atomic_counter_intrinsic(ir_call *ir);
diff --git a/src/mesa/drivers/dri/i965/brw_shader.h b/src/mesa/drivers/dri/i965/brw_shader.h
index ff5af93..936a207 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.h
+++ b/src/mesa/drivers/dri/i965/brw_shader.h
@@ -86,7 +86,7 @@ public:
    exec_list instructions;
 
    virtual void dump_instruction(backend_instruction *inst) = 0;
-   void dump_instructions();
+   virtual void dump_instructions();
 
    void assign_common_binding_table_offsets(uint32_t next_binding_table_offset);