i965/fs: Add support for translating ir_triop_fma into MAD.

Reviewed-by: Ian Romanick <[email protected]>

4 files changed, 10 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 52fa6f4a750..b770c0e9e19 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -179,6 +179,7 @@ ALU3(BFI2)
 ALU1(FBH)
 ALU1(FBL)
 ALU1(CBIT)
+ALU3(MAD)
 
 /** Gen4 predicated IF. */
 fs_inst *
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index 9d240b588ef..cb4ac3b455f 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -285,6 +285,7 @@ public:
    fs_inst *FBH(fs_reg dst, fs_reg value);
    fs_inst *FBL(fs_reg dst, fs_reg value);
    fs_inst *CBIT(fs_reg dst, fs_reg value);
+   fs_inst *MAD(fs_reg dst, fs_reg c, fs_reg b, fs_reg a);
 
    int type_size(const struct glsl_type *type);
    fs_inst *get_instruction_generating_reg(fs_inst *start,
diff --git a/src/mesa/drivers/dri/i965/brw_fs_channel_expressions.cpp b/src/mesa/drivers/dri/i965/brw_fs_channel_expressions.cpp
index 4afae245d0b..fa02d9be87b 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_channel_expressions.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_channel_expressions.cpp
@@ -360,6 +360,7 @@ ir_channel_expressions_visitor::visit_leave(ir_assignment *ir)
       assert(!"not yet supported");
       break;
 
+   case ir_triop_fma:
    case ir_triop_lrp:
    case ir_triop_bitfield_extract:
       for (i = 0; i < vector_elements; i++) {
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 6186a9c0c50..b0494364a1d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -718,6 +718,13 @@ fs_visitor::visit(ir_expression *ir)
       break;
    }
 
+   case ir_triop_fma:
+      /* Note that the instruction's argument order is reversed from GLSL
+       * and the IR.
+       */
+      emit(MAD(this->result, op[2], op[1], op[0]));
+      break;
+
    case ir_triop_lrp:
       emit_lrp(this->result, op[0], op[1], op[2]);
       break;