intel/compiler: skip MAD algebraic optimization for half-float or mixed mode

It is very likely that this optimzation is never useful and we'll probably
just end up removing it, so let's not bother adding more cases to it for
now.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp
index 186275b32406510da42fd84561619b17e23316e4..14d10a604139d3e4017024a41e350b5d512dca4a 100644 (file)
--- a/src/intel/compiler/brw_fs.cpp
+++ b/src/intel/compiler/brw_fs.cpp
@@ -2693,6 +2693,10 @@ fs_visitor::opt_algebraic()
          }
          break;
       case BRW_OPCODE_MAD:
+         if (inst->src[0].type != BRW_REGISTER_TYPE_F ||
+             inst->src[1].type != BRW_REGISTER_TYPE_F ||
+             inst->src[2].type != BRW_REGISTER_TYPE_F)
+            break;
          if (inst->src[1].is_one()) {
             inst->opcode = BRW_OPCODE_ADD;
             inst->src[1] = inst->src[2];