glsl: add lowering for double divide to rcp/mul

It looks like no hw does div anyways, so we should just
lower at the GLSL level.

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/glsl/lower_instructions.cpp b/src/glsl/lower_instructions.cpp
index e8a69e72ea3b196be2036c73e19159a97e82c9b8..4779de059adda963730f2f2fe4fde35faeff8490 100644 (file)
--- a/src/glsl/lower_instructions.cpp
+++ b/src/glsl/lower_instructions.cpp
@@ -199,7 +199,7 @@ lower_instructions_visitor::sub_to_add_neg(ir_expression *ir)
 void
 lower_instructions_visitor::div_to_mul_rcp(ir_expression *ir)
 {
-   assert(ir->operands[1]->type->is_float());
+   assert(ir->operands[1]->type->is_float() || ir->operands[1]->type->is_double());
 
    /* New expression for the 1.0 / op1 */
    ir_rvalue *expr;
@@ -327,7 +327,7 @@ lower_instructions_visitor::mod_to_floor(ir_expression *ir)
    /* Don't generate new IR that would need to be lowered in an additional
     * pass.
     */
-   if (lowering(DIV_TO_MUL_RCP) && ir->type->is_float())
+   if (lowering(DIV_TO_MUL_RCP) && (ir->type->is_float() || ir->type->is_double()))
       div_to_mul_rcp(div_expr);
 
    ir_expression *const floor_expr =
@@ -1014,7 +1014,8 @@ lower_instructions_visitor::visit_leave(ir_expression *ir)
    case ir_binop_div:
       if (ir->operands[1]->type->is_integer() && lowering(INT_DIV_TO_MUL_RCP))
         int_div_to_mul_rcp(ir);
-      else if (ir->operands[1]->type->is_float() && lowering(DIV_TO_MUL_RCP))
+      else if ((ir->operands[1]->type->is_float() ||
+                ir->operands[1]->type->is_double()) && lowering(DIV_TO_MUL_RCP))
         div_to_mul_rcp(ir);
       break;