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/*

 * Copyright © 2010 Intel Corporation

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

 * DEALINGS IN THE SOFTWARE.

 */

#include 

#include "main/core.h" /* for MAX2 */

#include "ir.h"

#include "ir_visitor.h"

#include "glsl_types.h"

ir_rvalue::ir_rvalue()

{

   this->type = glsl_type::error_type;

}

bool ir_rvalue::is_zero() const

{

   return false;

}

bool ir_rvalue::is_one() const

{

   return false;

}

bool ir_rvalue::is_negative_one() const

{

   return false;

}

/**

 * Modify the swizzle make to move one component to another

 *

 * \param m    IR swizzle to be modified

 * \param from Component in the RHS that is to be swizzled

 * \param to   Desired swizzle location of \c from

 */

static void

update_rhs_swizzle(ir_swizzle_mask &m, unsigned from, unsigned to)

{

   switch (to) {

   case 0: m.x = from; break;

   case 1: m.y = from; break;

   case 2: m.z = from; break;

   case 3: m.w = from; break;

   default: assert(!"Should not get here.");

   }

   m.num_components = MAX2(m.num_components, (to + 1));

}

void

ir_assignment::set_lhs(ir_rvalue *lhs)

{

   void *mem_ctx = this;

   bool swizzled = false;

   while (lhs != NULL) {

      ir_swizzle *swiz = lhs->as_swizzle();

      if (swiz == NULL)

	 break;

      unsigned write_mask = 0;

      ir_swizzle_mask rhs_swiz = { 0, 0, 0, 0, 0, 0 };

      for (unsigned i = 0; i < swiz->mask.num_components; i++) {

	 unsigned c = 0;

	 switch (i) {

	 case 0: c = swiz->mask.x; break;

	 case 1: c = swiz->mask.y; break;

	 case 2: c = swiz->mask.z; break;

	 case 3: c = swiz->mask.w; break;

	 default: assert(!"Should not get here.");

	 }

	 write_mask |= (((this->write_mask >> i) & 1) << c);

	 update_rhs_swizzle(rhs_swiz, i, c);

      }

      this->write_mask = write_mask;

      lhs = swiz->val;

      this->rhs = new(mem_ctx) ir_swizzle(this->rhs, rhs_swiz);

      swizzled = true;

   }

   if (swizzled) {

      /* Now, RHS channels line up with the LHS writemask.  Collapse it

       * to just the channels that will be written.

       */

      ir_swizzle_mask rhs_swiz = { 0, 0, 0, 0, 0, 0 };

      int rhs_chan = 0;

      for (int i = 0; i < 4; i++) {

	 if (write_mask & (1 << i))

	    update_rhs_swizzle(rhs_swiz, i, rhs_chan++);

      }

      this->rhs = new(mem_ctx) ir_swizzle(this->rhs, rhs_swiz);

   }

   assert((lhs == NULL) || lhs->as_dereference());

   this->lhs = (ir_dereference *) lhs;

}

ir_variable *

ir_assignment::whole_variable_written()

{

   ir_variable *v = this->lhs->whole_variable_referenced();

   if (v == NULL)

      return NULL;

   if (v->type->is_scalar())

      return v;

   if (v->type->is_vector()) {

      const unsigned mask = (1U << v->type->vector_elements) - 1;

      if (mask != this->write_mask)

	 return NULL;

   }

   /* Either all the vector components are assigned or the variable is some

    * composite type (and the whole thing is assigned.

    */

   return v;

}

ir_assignment::ir_assignment(ir_dereference *lhs, ir_rvalue *rhs,

			     ir_rvalue *condition, unsigned write_mask)

{

   this->ir_type = ir_type_assignment;

   this->condition = condition;

   this->rhs = rhs;

   this->lhs = lhs;

   this->write_mask = write_mask;

   if (lhs->type->is_scalar() || lhs->type->is_vector()) {

      int lhs_components = 0;

      for (int i = 0; i < 4; i++) {

	 if (write_mask & (1 << i))

	    lhs_components++;

      }

      assert(lhs_components == this->rhs->type->vector_elements);

   }

}

ir_assignment::ir_assignment(ir_rvalue *lhs, ir_rvalue *rhs,

			     ir_rvalue *condition)

{

   this->ir_type = ir_type_assignment;

   this->condition = condition;

   this->rhs = rhs;

   /* If the RHS is a vector type, assume that all components of the vector

    * type are being written to the LHS.  The write mask comes from the RHS

    * because we can have a case where the LHS is a vec4 and the RHS is a

    * vec3.  In that case, the assignment is:

    *

    *     (assign (...) (xyz) (var_ref lhs) (var_ref rhs))

    */

   if (rhs->type->is_vector())

      this->write_mask = (1U << rhs->type->vector_elements) - 1;

   else if (rhs->type->is_scalar())

      this->write_mask = 1;

   else

      this->write_mask = 0;

   this->set_lhs(lhs);

}

ir_expression::ir_expression(int op, const struct glsl_type *type,

			     ir_rvalue *op0)

{

   assert(get_num_operands(ir_expression_operation(op)) == 1);

   this->ir_type = ir_type_expression;

   this->type = type;

   this->operation = ir_expression_operation(op);

   this->operands[0] = op0;

   this->operands[1] = NULL;

   this->operands[2] = NULL;

   this->operands[3] = NULL;

}

ir_expression::ir_expression(int op, const struct glsl_type *type,

			     ir_rvalue *op0, ir_rvalue *op1)

{

   assert(((op1 == NULL) && (get_num_operands(ir_expression_operation(op)) == 1))

	  || (get_num_operands(ir_expression_operation(op)) == 2));

   this->ir_type = ir_type_expression;

   this->type = type;

   this->operation = ir_expression_operation(op);

   this->operands[0] = op0;

   this->operands[1] = op1;

   this->operands[2] = NULL;

   this->operands[3] = NULL;

}

ir_expression::ir_expression(int op, const struct glsl_type *type,

			     ir_rvalue *op0, ir_rvalue *op1,

			     ir_rvalue *op2, ir_rvalue *op3)

{

   this->ir_type = ir_type_expression;

   this->type = type;

   this->operation = ir_expression_operation(op);

   this->operands[0] = op0;

   this->operands[1] = op1;

   this->operands[2] = op2;

   this->operands[3] = op3;

}

ir_expression::ir_expression(int op, ir_rvalue *op0)

{

   this->ir_type = ir_type_expression;

   this->operation = ir_expression_operation(op);

   this->operands[0] = op0;

   this->operands[1] = NULL;

   this->operands[2] = NULL;

   this->operands[3] = NULL;

   assert(op <= ir_last_unop);

   switch (this->operation) {

   case ir_unop_bit_not:

   case ir_unop_logic_not:

   case ir_unop_neg:

   case ir_unop_abs:

   case ir_unop_sign:

   case ir_unop_rcp:

   case ir_unop_rsq:

   case ir_unop_sqrt:

   case ir_unop_exp:

   case ir_unop_log:

   case ir_unop_exp2:

   case ir_unop_log2:

   case ir_unop_trunc:

   case ir_unop_ceil:

   case ir_unop_floor:

   case ir_unop_fract:

   case ir_unop_round_even:

   case ir_unop_cos:

   case ir_unop_dFdx:

   case ir_unop_dFdy:

      this->type = op0->type;

      break;

   case ir_unop_any:

      this->type = glsl_type::bool_type;

      break;

   default:

      assert(!"not reached: missing automatic type setup for ir_expression");

      this->type = op0->type;

      break;

   }

}

ir_expression::ir_expression(int op, ir_rvalue *op0, ir_rvalue *op1)

{

   this->ir_type = ir_type_expression;

   this->operation = ir_expression_operation(op);

   this->operands[0] = op0;

   this->operands[1] = op1;

   this->operands[2] = NULL;

   this->operands[3] = NULL;

   assert(op > ir_last_unop);

   switch (this->operation) {

   case ir_binop_all_equal:

   case ir_binop_any_nequal:

      this->type = glsl_type::bool_type;

      break;

   case ir_binop_add:

   case ir_binop_sub:

   case ir_binop_min:

   case ir_binop_max:

   case ir_binop_pow:

   case ir_binop_mul:

      if (op0->type->is_scalar()) {

	 this->type = op1->type;

      } else if (op1->type->is_scalar()) {

	 this->type = op0->type;

      } else {

	 /* FINISHME: matrix types */

	 assert(!op0->type->is_matrix() && !op1->type->is_matrix());

	 assert(op0->type == op1->type);

	 this->type = op0->type;

      }

      break;

   case ir_binop_logic_and:

   case ir_binop_logic_or:

      if (op0->type->is_scalar()) {

	 this->type = op1->type;

      } else if (op1->type->is_scalar()) {

	 this->type = op0->type;

      }

      break;

   case ir_binop_dot:

      this->type = glsl_type::float_type;

      break;

   default:

      assert(!"not reached: missing automatic type setup for ir_expression");

      this->type = glsl_type::float_type;

   }

}

unsigned int

ir_expression::get_num_operands(ir_expression_operation op)

{

   assert(op <= ir_last_opcode);

   if (op <= ir_last_unop)

      return 1;

   if (op <= ir_last_binop)

      return 2;

   if (op == ir_quadop_vector)

      return 4;

   assert(false);

   return 0;

}

static const char *const operator_strs[] = {

   "~",

   "!",

   "neg",

   "abs",

   "sign",

   "rcp",

   "rsq",

   "sqrt",

   "exp",

   "log",

   "exp2",

   "log2",

   "f2i",

   "i2f",

   "f2b",

   "b2f",

   "i2b",

   "b2i",

   "u2f",

   "any",

   "trunc",

   "ceil",

   "floor",

   "fract",

   "round_even",

   "sin",

   "cos",

   "sin_reduced",

   "cos_reduced",

   "dFdx",

   "dFdy",

   "noise",

   "+",

   "-",

   "*",

   "/",

   "%",

   "<",

   ">",

   "<=",

   ">=",

   "==",

   "!=",

   "all_equal",

   "any_nequal",

   "<<",

   ">>",

   "&",

   "^",

   "|",

   "&&",

   "^^",

   "||",

   "dot",

   "min",

   "max",

   "pow",

   "vector",

};

const char *ir_expression::operator_string(ir_expression_operation op)

{

   assert((unsigned int) op < Elements(operator_strs));

   assert(Elements(operator_strs) == (ir_quadop_vector + 1));

   return operator_strs[op];

}

const char *ir_expression::operator_string()

{

   return operator_string(this->operation);

}

ir_expression_operation

ir_expression::get_operator(const char *str)

{

   const int operator_count = sizeof(operator_strs) / sizeof(operator_strs[0]);

   for (int op = 0; op < operator_count; op++) {

      if (strcmp(str, operator_strs[op]) == 0)

	 return (ir_expression_operation) op;

   }

   return (ir_expression_operation) -1;

}

ir_constant::ir_constant()

{

   this->ir_type = ir_type_constant;

}

ir_constant::ir_constant(const struct glsl_type *type,

			 const ir_constant_data *data)

{

   assert((type->base_type >= GLSL_TYPE_UINT)

	  && (type->base_type <= GLSL_TYPE_BOOL));

   this->ir_type = ir_type_constant;

   this->type = type;

   memcpy(& this->value, data, sizeof(this->value));

}

ir_constant::ir_constant(float f)

{

   this->ir_type = ir_type_constant;

   this->type = glsl_type::float_type;

   this->value.f[0] = f;

   for (int i = 1; i < 16; i++)  {

      this->value.f[i] = 0;

   }

}

ir_constant::ir_constant(unsigned int u)

{

   this->ir_type = ir_type_constant;

   this->type = glsl_type::uint_type;

   this->value.u[0] = u;

   for (int i = 1; i < 16; i++) {

      this->value.u[i] = 0;

   }

}

ir_constant::ir_constant(int i)

{

   this->ir_type = ir_type_constant;

   this->type = glsl_type::int_type;

   this->value.i[0] = i;

   for (int i = 1; i < 16; i++) {

      this->value.i[i] = 0;

   }

}

ir_constant::ir_constant(bool b)

{

   this->ir_type = ir_type_constant;

   this->type = glsl_type::bool_type;

   this->value.b[0] = b;

   for (int i = 1; i < 16; i++) {

      this->value.b[i] = false;

   }

}

ir_constant::ir_constant(const ir_constant *c, unsigned i)

{

   this->ir_type = ir_type_constant;

   this->type = c->type->get_base_type();

   switch (this->type->base_type) {

   case GLSL_TYPE_UINT:  this->value.u[0] = c->value.u[i]; break;

   case GLSL_TYPE_INT:   this->value.i[0] = c->value.i[i]; break;

   case GLSL_TYPE_FLOAT: this->value.f[0] = c->value.f[i]; break;

   case GLSL_TYPE_BOOL:  this->value.b[0] = c->value.b[i]; break;

   default:              assert(!"Should not get here."); break;

   }

}

ir_constant::ir_constant(const struct glsl_type *type, exec_list *value_list)

{

   this->ir_type = ir_type_constant;

   this->type = type;

   assert(type->is_scalar() || type->is_vector() || type->is_matrix()

	  || type->is_record() || type->is_array());

   if (type->is_array()) {

      this->array_elements = ralloc_array(this, ir_constant *, type->length);

      unsigned i = 0;

      foreach_list(node, value_list) {

	 ir_constant *value = (ir_constant *) node;

	 assert(value->as_constant() != NULL);

	 this->array_elements[i++] = value;

      }

      return;

   }

   /* If the constant is a record, the types of each of the entries in

    * value_list must be a 1-for-1 match with the structure components.  Each

    * entry must also be a constant.  Just move the nodes from the value_list

    * to the list in the ir_constant.

    */

   /* FINISHME: Should there be some type checking and / or assertions here? */

   /* FINISHME: Should the new constant take ownership of the nodes from

    * FINISHME: value_list, or should it make copies?

    */

   if (type->is_record()) {

      value_list->move_nodes_to(& this->components);

      return;

   }

   for (unsigned i = 0; i < 16; i++) {

      this->value.u[i] = 0;

   }

   ir_constant *value = (ir_constant *) (value_list->head);

   /* Constructors with exactly one scalar argument are special for vectors

    * and matrices.  For vectors, the scalar value is replicated to fill all

    * the components.  For matrices, the scalar fills the components of the

    * diagonal while the rest is filled with 0.

    */

   if (value->type->is_scalar() && value->next->is_tail_sentinel()) {

      if (type->is_matrix()) {

	 /* Matrix - fill diagonal (rest is already set to 0) */

	 assert(type->base_type == GLSL_TYPE_FLOAT);

	 for (unsigned i = 0; i < type->matrix_columns; i++)

	    this->value.f[i * type->vector_elements + i] = value->value.f[0];

      } else {

	 /* Vector or scalar - fill all components */

	 switch (type->base_type) {

	 case GLSL_TYPE_UINT:

	 case GLSL_TYPE_INT:

	    for (unsigned i = 0; i < type->components(); i++)

	       this->value.u[i] = value->value.u[0];

	    break;

	 case GLSL_TYPE_FLOAT:

	    for (unsigned i = 0; i < type->components(); i++)

	       this->value.f[i] = value->value.f[0];

	    break;

	 case GLSL_TYPE_BOOL:

	    for (unsigned i = 0; i < type->components(); i++)

	       this->value.b[i] = value->value.b[0];

	    break;

	 default:

	    assert(!"Should not get here.");

	    break;

	 }

      }

      return;

   }

   if (type->is_matrix() && value->type->is_matrix()) {

      assert(value->next->is_tail_sentinel());

      /* From section 5.4.2 of the GLSL 1.20 spec:

       * "If a matrix is constructed from a matrix, then each component

       *  (column i, row j) in the result that has a corresponding component

       *  (column i, row j) in the argument will be initialized from there."

       */

      unsigned cols = MIN2(type->matrix_columns, value->type->matrix_columns);

      unsigned rows = MIN2(type->vector_elements, value->type->vector_elements);

      for (unsigned i = 0; i < cols; i++) {

	 for (unsigned j = 0; j < rows; j++) {

	    const unsigned src = i * value->type->vector_elements + j;

	    const unsigned dst = i * type->vector_elements + j;

	    this->value.f[dst] = value->value.f[src];

	 }

      }

      /* "All other components will be initialized to the identity matrix." */

      for (unsigned i = cols; i < type->matrix_columns; i++)

	 this->value.f[i * type->vector_elements + i] = 1.0;

      return;

   }

   /* Use each component from each entry in the value_list to initialize one

    * component of the constant being constructed.

    */

   for (unsigned i = 0; i < type->components(); /* empty */) {

      assert(value->as_constant() != NULL);

      assert(!value->is_tail_sentinel());

      for (unsigned j = 0; j < value->type->components(); j++) {

	 switch (type->base_type) {

	 case GLSL_TYPE_UINT:

	    this->value.u[i] = value->get_uint_component(j);

	    break;

	 case GLSL_TYPE_INT:

	    this->value.i[i] = value->get_int_component(j);

	    break;

	 case GLSL_TYPE_FLOAT:

	    this->value.f[i] = value->get_float_component(j);

	    break;

	 case GLSL_TYPE_BOOL:

	    this->value.b[i] = value->get_bool_component(j);

	    break;

	 default:

	    /* FINISHME: What to do?  Exceptions are not the answer.

	     */

	    break;

	 }

	 i++;

	 if (i >= type->components())

	    break;

      }

      value = (ir_constant *) value->next;

   }

}

ir_constant *

ir_constant::zero(void *mem_ctx, const glsl_type *type)

{

   assert(type->is_numeric() || type->is_boolean());

   ir_constant *c = new(mem_ctx) ir_constant;

   c->type = type;

   memset(&c->value, 0, sizeof(c->value));

   return c;

}

bool

ir_constant::get_bool_component(unsigned i) const

{

   switch (this->type->base_type) {

   case GLSL_TYPE_UINT:  return this->value.u[i] != 0;

   case GLSL_TYPE_INT:   return this->value.i[i] != 0;

   case GLSL_TYPE_FLOAT: return ((int)this->value.f[i]) != 0;

   case GLSL_TYPE_BOOL:  return this->value.b[i];

   default:              assert(!"Should not get here."); break;

   }

   /* Must return something to make the compiler happy.  This is clearly an

    * error case.

    */

   return false;

}

float

ir_constant::get_float_component(unsigned i) const

{

   switch (this->type->base_type) {

   case GLSL_TYPE_UINT:  return (float) this->value.u[i];

   case GLSL_TYPE_INT:   return (float) this->value.i[i];

   case GLSL_TYPE_FLOAT: return this->value.f[i];

   case GLSL_TYPE_BOOL:  return this->value.b[i] ? 1.0 : 0.0;

   default:              assert(!"Should not get here."); break;

   }

   /* Must return something to make the compiler happy.  This is clearly an

    * error case.

    */

   return 0.0;

}

int

ir_constant::get_int_component(unsigned i) const

{

   switch (this->type->base_type) {

   case GLSL_TYPE_UINT:  return this->value.u[i];

   case GLSL_TYPE_INT:   return this->value.i[i];

   case GLSL_TYPE_FLOAT: return (int) this->value.f[i];

   case GLSL_TYPE_BOOL:  return this->value.b[i] ? 1 : 0;

   default:              assert(!"Should not get here."); break;

   }

   /* Must return something to make the compiler happy.  This is clearly an

    * error case.

    */

   return 0;

}

unsigned

ir_constant::get_uint_component(unsigned i) const

{

   switch (this->type->base_type) {

   case GLSL_TYPE_UINT:  return this->value.u[i];

   case GLSL_TYPE_INT:   return this->value.i[i];

   case GLSL_TYPE_FLOAT: return (unsigned) this->value.f[i];

   case GLSL_TYPE_BOOL:  return this->value.b[i] ? 1 : 0;

   default:              assert(!"Should not get here."); break;

   }

   /* Must return something to make the compiler happy.  This is clearly an

    * error case.

    */

   return 0;

}

ir_constant *

ir_constant::get_array_element(unsigned i) const

{

   assert(this->type->is_array());

   /* From page 35 (page 41 of the PDF) of the GLSL 1.20 spec:

    *

    *     "Behavior is undefined if a shader subscripts an array with an index

    *     less than 0 or greater than or equal to the size the array was

    *     declared with."

    *

    * Most out-of-bounds accesses are removed before things could get this far.

    * There are cases where non-constant array index values can get constant

    * folded.

    */

   if (int(i) < 0)

      i = 0;

   else if (i >= this->type->length)

      i = this->type->length - 1;

   return array_elements[i];

}

ir_constant *

ir_constant::get_record_field(const char *name)

{

   int idx = this->type->field_index(name);

   if (idx < 0)

      return NULL;

   if (this->components.is_empty())

      return NULL;

   exec_node *node = this->components.head;

   for (int i = 0; i < idx; i++) {

      node = node->next;

      /* If the end of the list is encountered before the element matching the

       * requested field is found, return NULL.

       */

      if (node->is_tail_sentinel())

	 return NULL;

   }

   return (ir_constant *) node;

}

bool

ir_constant::has_value(const ir_constant *c) const

{

   if (this->type != c->type)

      return false;

   if (this->type->is_array()) {

      for (unsigned i = 0; i < this->type->length; i++) {

	 if (!this->array_elements[i]->has_value(c->array_elements[i]))

	    return false;

      }

      return true;

   }

   if (this->type->base_type == GLSL_TYPE_STRUCT) {

      const exec_node *a_node = this->components.head;

      const exec_node *b_node = c->components.head;

      while (!a_node->is_tail_sentinel()) {

	 assert(!b_node->is_tail_sentinel());

	 const ir_constant *const a_field = (ir_constant *) a_node;

	 const ir_constant *const b_field = (ir_constant *) b_node;

	 if (!a_field->has_value(b_field))

	    return false;

	 a_node = a_node->next;

	 b_node = b_node->next;

      }

      return true;

   }

   for (unsigned i = 0; i < this->type->components(); i++) {

      switch (this->type->base_type) {

      case GLSL_TYPE_UINT:

	 if (this->value.u[i] != c->value.u[i])

	    return false;

	 break;

      case GLSL_TYPE_INT:

	 if (this->value.i[i] != c->value.i[i])

	    return false;

	 break;

      case GLSL_TYPE_FLOAT:

	 if (this->value.f[i] != c->value.f[i])

	    return false;

	 break;

      case GLSL_TYPE_BOOL:

	 if (this->value.b[i] != c->value.b[i])

	    return false;

	 break;

      default:

	 assert(!"Should not get here.");

	 return false;

      }

   }

   return true;

}

bool

ir_constant::is_zero() const

{

   if (!this->type->is_scalar() && !this->type->is_vector())

      return false;

   for (unsigned c = 0; c < this->type->vector_elements; c++) {

      switch (this->type->base_type) {

      case GLSL_TYPE_FLOAT:

	 if (this->value.f[c] != 0.0)

	    return false;

	 break;

      case GLSL_TYPE_INT:

	 if (this->value.i[c] != 0)

	    return false;

	 break;

      case GLSL_TYPE_UINT:

	 if (this->value.u[c] != 0)

	    return false;

	 break;

      case GLSL_TYPE_BOOL:

	 if (this->value.b[c] != false)

	    return false;

	 break;

      default:

	 /* The only other base types are structures, arrays, and samplers.

	  * Samplers cannot be constants, and the others should have been

	  * filtered out above.

	  */

	 assert(!"Should not get here.");

	 return false;

      }

   }

   return true;

}

bool

ir_constant::is_one() const

{

   if (!this->type->is_scalar() && !this->type->is_vector())

      return false;

   for (unsigned c = 0; c < this->type->vector_elements; c++) {

      switch (this->type->base_type) {

      case GLSL_TYPE_FLOAT:

	 if (this->value.f[c] != 1.0)

	    return false;

	 break;

      case GLSL_TYPE_INT:

	 if (this->value.i[c] != 1)

	    return false;

	 break;

      case GLSL_TYPE_UINT:

	 if (this->value.u[c] != 1)

	    return false;

	 break;

      case GLSL_TYPE_BOOL:

	 if (this->value.b[c] != true)

	    return false;

	 break;

      default:

	 /* The only other base types are structures, arrays, and samplers.

	  * Samplers cannot be constants, and the others should have been

	  * filtered out above.

	  */

	 assert(!"Should not get here.");

	 return false;

      }

   }

   return true;

}

bool

ir_constant::is_negative_one() const

{

   if (!this->type->is_scalar() && !this->type->is_vector())

      return false;

   if (this->type->is_boolean())

      return false;

   for (unsigned c = 0; c < this->type->vector_elements; c++) {

      switch (this->type->base_type) {

      case GLSL_TYPE_FLOAT:

	 if (this->value.f[c] != -1.0)

	    return false;

	 break;

      case GLSL_TYPE_INT:

	 if (this->value.i[c] != -1)

	    return false;

	 break;

      case GLSL_TYPE_UINT:

	 if (int(this->value.u[c]) != -1)

	    return false;

	 break;

      default:

	 /* The only other base types are structures, arrays, samplers, and

	  * booleans.  Samplers cannot be constants, and the others should

	  * have been filtered out above.

	  */

	 assert(!"Should not get here.");

	 return false;

      }

   }

   return true;

}

ir_loop::ir_loop()

{

   this->ir_type = ir_type_loop;

   this->cmp = ir_unop_neg;

   this->from = NULL;

   this->to = NULL;

   this->increment = NULL;

   this->counter = NULL;

}

ir_dereference_variable::ir_dereference_variable(ir_variable *var)

{

   this->ir_type = ir_type_dereference_variable;

   this->var = var;

   this->type = (var != NULL) ? var->type : glsl_type::error_type;

}

ir_dereference_array::ir_dereference_array(ir_rvalue *value,

					   ir_rvalue *array_index)

{

   this->ir_type = ir_type_dereference_array;

   this->array_index = array_index;

   this->set_array(value);

}

ir_dereference_array::ir_dereference_array(ir_variable *var,

					   ir_rvalue *array_index)

{

   void *ctx = ralloc_parent(var);

   this->ir_type = ir_type_dereference_array;

   this->array_index = array_index;

   this->set_array(new(ctx) ir_dereference_variable(var));

}

void

ir_dereference_array::set_array(ir_rvalue *value)

{

   this->array = value;

   this->type = glsl_type::error_type;

   if (this->array != NULL) {

      const glsl_type *const vt = this->array->type;

      if (vt->is_array()) {

	 type = vt->element_type();

      } else if (vt->is_matrix()) {

	 type = vt->column_type();

      } else if (vt->is_vector()) {

	 type = vt->get_base_type();

      }

   }

}

ir_dereference_record::ir_dereference_record(ir_rvalue *value,

					     const char *field)

{

   this->ir_type = ir_type_dereference_record;

   this->record = value;

   this->field = ralloc_strdup(this, field);

   this->type = (this->record != NULL)

      ? this->record->type->field_type(field) : glsl_type::error_type;

}

ir_dereference_record::ir_dereference_record(ir_variable *var,

					     const char *field)

{

   void *ctx = ralloc_parent(var);

   this->ir_type = ir_type_dereference_record;

   this->record = new(ctx) ir_dereference_variable(var);

   this->field = ralloc_strdup(this, field);

   this->type = (this->record != NULL)

      ? this->record->type->field_type(field) : glsl_type::error_type;

}

bool type_contains_sampler(const glsl_type *type)

{

   if (type->is_array()) {

      return type_contains_sampler(type->fields.array);

   } else if (type->is_record()) {

      for (unsigned int i = 0; i < type->length; i++) {

	 if (type_contains_sampler(type->fields.structure[i].type))

	    return true;

      }

      return false;

   } else {

      return type->is_sampler();

   }

}

bool

ir_dereference::is_lvalue()

{

   ir_variable *var = this->variable_referenced();

   /* Every l-value derference chain eventually ends in a variable.

    */

   if ((var == NULL) || var->read_only)

      return false;

   if (this->type->is_array() && !var->array_lvalue)

      return false;

   /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:

    *

    *    "Samplers cannot be treated as l-values; hence cannot be used

    *     as out or inout function parameters, nor can they be

    *     assigned into."

    */

   if (type_contains_sampler(this->type))

      return false;

   return true;

}

const char *tex_opcode_strs[] = { "tex", "txb", "txl", "txd", "txf" };

const char *ir_texture::opcode_string()

{

   assert((unsigned int) op <=

	  sizeof(tex_opcode_strs) / sizeof(tex_opcode_strs[0]));

   return tex_opcode_strs[op];

}

ir_texture_opcode

ir_texture::get_opcode(const char *str)

{

   const int count = sizeof(tex_opcode_strs) / sizeof(tex_opcode_strs[0]);

   for (int op = 0; op < count; op++) {

      if (strcmp(str, tex_opcode_strs[op]) == 0)

	 return (ir_texture_opcode) op;

   }

   return (ir_texture_opcode) -1;

}

void

ir_texture::set_sampler(ir_dereference *sampler)

{

   assert(sampler != NULL);

   this->sampler = sampler;

   switch (sampler->type->sampler_type) {

   case GLSL_TYPE_FLOAT:

      this->type = glsl_type::vec4_type;

      break;

   case GLSL_TYPE_INT:

      this->type = glsl_type::ivec4_type;

      break;

   case GLSL_TYPE_UINT:

      this->type = glsl_type::uvec4_type;

      break;

   }

}

void

ir_swizzle::init_mask(const unsigned *comp, unsigned count)

{

   assert((count >= 1) && (count <= 4));

   memset(&this->mask, 0, sizeof(this->mask));

   this->mask.num_components = count;

   unsigned dup_mask = 0;

   switch (count) {

   case 4:

      assert(comp[3] <= 3);

      dup_mask |= (1U << comp[3])

	 & ((1U << comp[0]) | (1U << comp[1]) | (1U << comp[2]));

      this->mask.w = comp[3];

   case 3:

      assert(comp[2] <= 3);

      dup_mask |= (1U << comp[2])

	 & ((1U << comp[0]) | (1U << comp[1]));

      this->mask.z = comp[2];