diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp index dc11d9883ca..69399045d85 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp @@ -136,6 +136,12 @@ vec4_visitor::emit_math1_gen6(enum opcode opcode, dst_reg dst, src_reg src) /* The gen6 math instruction ignores the source modifiers -- * swizzle, abs, negate, and at least some parts of the register * region description. + * + * While it would seem that this MOV could be avoided at this point + * in the case that the swizzle is matched up with the destination + * writemask, note that uniform packing and register allocation + * could rearrange our swizzle, so let's leave this matter up to + * copy propagation later. */ src_reg temp_src = src_reg(this, glsl_type::vec4_type); emit(BRW_OPCODE_MOV, dst_reg(temp_src), src); |