Mesa (master): mesa/program: Translate csel operation from GLSL IR.

[Francisco Jerez]

Module: Mesa
Branch: master
Commit: e81130d7a146fe6a750bf903e910dc2c7c90d513
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e81130d7a146fe6a750bf903e910dc2c7c90d513

Author: Francisco Jerez <currojerez at riseup.net>
Date:   Mon Jan 23 23:53:03 2017 -0800

mesa/program: Translate csel operation from GLSL IR.

This will be used internally by the GLSL front-end in order to
implement some built-in functions. Plumb it through MESA IR for
back-ends that rely on this translation pass.

v2: Add comment.

Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Juan A. Suarez Romero <jasuarez at igalia.com>

---

 src/mesa/program/ir_to_mesa.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 0ae797f..dc5f801 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -1360,13 +1360,20 @@ ir_to_mesa_visitor::visit(ir_expression *ir)
       emit(ir, OPCODE_LRP, result_dst, op[2], op[1], op[0]);
       break;
 
+   case ir_triop_csel:
+      /* We assume that boolean true and false are 1.0 and 0.0.  OPCODE_CMP
+       * selects src1 if src0 is < 0, src2 otherwise.
+       */
+      op[0].negate = ~op[0].negate;
+      emit(ir, OPCODE_CMP, result_dst, op[0], op[1], op[2]);
+      break;
+
    case ir_binop_vector_extract:
    case ir_triop_fma:
    case ir_triop_bitfield_extract:
    case ir_triop_vector_insert:
    case ir_quadop_bitfield_insert:
    case ir_binop_ldexp:
-   case ir_triop_csel:
    case ir_binop_carry:
    case ir_binop_borrow:
    case ir_binop_imul_high: