Mark DPH recognition done

1 files changed, 0 insertions, 4 deletions

diff --git a/I965Todo.mdwn b/I965Todo.mdwn
index 2a2144f..f427083 100644
--- a/I965Todo.mdwn
+++ b/I965Todo.mdwn
@@ -47,10 +47,6 @@ when it would be better to produce something like:
     (+f0) cmp.e.f0(8)     g34<1>D         g5<8,8,1>F      g33<8,8,1>F     { align1 WE_normal 1Q };
     (+f0) if(8) 0 0                       null            0x00000000UD    { align1 WE_normal 1Q switch };
 
-### Recognize DPH structures and generate them. (moderate).
-
-We could teach nir_opt_algebraic to recognize fdp4 with the first source's .w component == 1.0 and turn that into fdph.  There are probably patterns where teaching nir_search about swizzles would be useful.
-
 ### Return-from-main using HALT (easy)
 
 Right now when there's a "return" in the main() function, we lower all later assignments to be conditional moves.  But, using the HALT instruction we can tell the hardware to stop execution for some channels until a certain IP is reached.  We use this for discards to have subspans stop executing once they're discarded (for efficiency), and we basically that on a channel-wise basis for return-from-main.  Take a look at FS_OPCODE_DISCARD_JUMP, FS_OPCODE_PLACEHOLDER_HALT, and patch_discard_jumps_to_fb_writes()