Removes unnecessary MOV instructions in L4D2, TF2, Dota2, and many other
Steam games.
total instructions in shared programs:
1668126 ->
1657509 (-0.64%)
instructions in affected programs: 242235 -> 231618 (-4.38%)
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
if (src.file != UNIFORM && src.file != IMM)
return src;
+ if (src.file == UNIFORM && brw_is_single_value_swizzle(src.swizzle))
+ return src;
+
dst_reg expanded = dst_reg(this, glsl_type::vec4_type);
expanded.type = src.type;
emit(MOV(expanded, src));