ir_to_mesa, glsl_to_tgsi: Remove try_emit_saturate

Now that saturate is implemented natively as instruction,
we can cut down on unneeded functionality.

Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>
Signed-off-by: Abdiel Janulgue <[email protected]>

1 files changed, 0 insertions, 51 deletions

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 55b994008d1..2946286768b 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -446,7 +446,6 @@ public:
               int mul_operand);
    bool try_emit_mad_for_and_not(ir_expression *ir,
               int mul_operand);
-   bool try_emit_sat(ir_expression *ir);
 
    void emit_swz(ir_expression *ir);
 
@@ -1270,53 +1269,6 @@ glsl_to_tgsi_visitor::try_emit_mad_for_and_not(ir_expression *ir, int try_operan
    return true;
 }
 
-bool
-glsl_to_tgsi_visitor::try_emit_sat(ir_expression *ir)
-{
-   /* Emit saturates in the vertex shader only if SM 3.0 is supported.
-    */
-   if (this->prog->Target == GL_VERTEX_PROGRAM_ARB &&
-       !st_context(this->ctx)->has_shader_model3) {
-      return false;
-   }
-
-   ir_rvalue *sat_src = ir->as_rvalue_to_saturate();
-   if (!sat_src)
-      return false;
-
-   sat_src->accept(this);
-   st_src_reg src = this->result;
-
-   /* If we generated an expression instruction into a temporary in
-    * processing the saturate's operand, apply the saturate to that
-    * instruction.  Otherwise, generate a MOV to do the saturate.
-    *
-    * Note that we have to be careful to only do this optimization if
-    * the instruction in question was what generated src->result.  For
-    * example, ir_dereference_array might generate a MUL instruction
-    * to create the reladdr, and return us a src reg using that
-    * reladdr.  That MUL result is not the value we're trying to
-    * saturate.
-    */
-   ir_expression *sat_src_expr = sat_src->as_expression();
-   if (sat_src_expr && (sat_src_expr->operation == ir_binop_mul ||
-			sat_src_expr->operation == ir_binop_add ||
-			sat_src_expr->operation == ir_binop_dot)) {
-      glsl_to_tgsi_instruction *new_inst;
-      new_inst = (glsl_to_tgsi_instruction *)this->instructions.get_tail();
-      new_inst->saturate = true;
-   } else {
-      this->result = get_temp(ir->type);
-      st_dst_reg result_dst = st_dst_reg(this->result);
-      result_dst.writemask = (1 << ir->type->vector_elements) - 1;
-      glsl_to_tgsi_instruction *inst;
-      inst = emit(ir, TGSI_OPCODE_MOV, result_dst, src);
-      inst->saturate = true;
-   }
-
-   return true;
-}
-
 void
 glsl_to_tgsi_visitor::reladdr_to_temp(ir_instruction *ir,
         			    st_src_reg *reg, int *num_reladdr)
@@ -1363,9 +1315,6 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
 	 return;
    }
 
-   if (try_emit_sat(ir))
-      return;
-
    if (ir->operation == ir_quadop_vector)
       assert(!"ir_quadop_vector should have been lowered");