Mesa (master): glsl: add lowering for double divide to rcp/mul

[Dave Airlie]

Module: Mesa
Branch: master
Commit: 2e9f4eadfbe8e1eae657c268cb31515a872eceb4
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2e9f4eadfbe8e1eae657c268cb31515a872eceb4

Author: Dave Airlie <airlied at redhat.com>
Date:   Mon Feb  9 16:53:10 2015 +1000

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 at alum.mit.edu>
Signed-off-by: Dave Airlie <airlied at redhat.com>

---

 src/glsl/lower_instructions.cpp |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/glsl/lower_instructions.cpp b/src/glsl/lower_instructions.cpp
index e8a69e7..4779de0 100644
--- 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;