glsl: Add ir_quadop_vector expression

The vector operator collects 2, 3, or 4 scalar components into a
vector.  Doing this has several advantages.  First, it will make
ud-chain tracking for components of vectors much easier.  Second, a
later optimization pass could collect scalars into vectors to allow
generation of SWZ instructions (or similar as operands to other
instructions on R200 and i915).  It also enables an easy way to
generate IR for SWZ instructions in the ARB_vertex_program assembler.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
index 1fe15050470..4fd6d09a3af 100644
--- a/src/glsl/ir_constant_expression.cpp
+++ b/src/glsl/ir_constant_expression.cpp
@@ -788,6 +788,24 @@ ir_expression::constant_expression_value()
       }
       break;
 
+   case ir_quadop_vector:
+      for (unsigned c = 0; c < this->type->vector_elements; c++) {
+	 switch (this->type->base_type) {
+	 case GLSL_TYPE_INT:
+	    data.i[c] = op[c]->value.i[0];
+	    break;
+	 case GLSL_TYPE_UINT:
+	    data.u[c] = op[c]->value.u[0];
+	    break;
+	 case GLSL_TYPE_FLOAT:
+	    data.f[c] = op[c]->value.f[0];
+	    break;
+	 default:
+	    assert(0);
+	 }
+      }
+      break;
+
    default:
       /* FINISHME: Should handle all expression types. */
       return NULL;