i965/vs: Teach copy propagation about sends from GRFs.

This incidentally also teaches it a bit about gen6 math -- we now allow
unswizzled, unmodified GRF temps as the sources for math.

Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index 91b72f7f20b..35dd9aed43c 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -225,6 +225,18 @@ vec4_instruction::is_send_from_grf()
    return false;
 }
 
+bool
+vec4_visitor::can_do_source_mods(vec4_instruction *inst)
+{
+   if (intel->gen == 6 && inst->is_math())
+      return false;
+
+   if (inst->is_send_from_grf())
+      return false;
+
+   return true;
+}
+
 /**
  * Returns how many MRFs an opcode will write over.
  *