i965/vec4: Do separate copy followed by constant propagation after opt_vector_float().

total instructions in shared programs: 5877012 -> 5876617 (-0.01%)
instructions in affected programs:     33140 -> 32745 (-1.19%)

From before the commit that allows VF constant propagation (which hurt
some programs) to here, the results are:

total instructions in shared programs: 5877951 -> 5876617 (-0.02%)
instructions in affected programs:     123444 -> 122110 (-1.08%)

with no programs hurt.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index 296223c..f389392 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -1800,7 +1800,8 @@ vec4_visitor::run()
 
    if (opt_vector_float()) {
       opt_cse();
-      opt_copy_propagation();
+      opt_copy_propagation(false);
+      opt_copy_propagation(true);
       dead_code_eliminate();
    }