/*
 * Copyright 2009 Nicolai Haehnle.
 * Copyright 2011 Tom Stellard <tstellar@gmail.com>
 * Copyright 2012 Advanced Micro Devices, Inc.
 * Author: Tom Stellard <thomas.stellard@amd.com>
 * SPDX-License-Identifier: MIT
 */

#ifndef RADEON_REGALLOC_H
#define RADEON_REGALLOC_H

#include "util/ralloc.h"
#include "util/register_allocate.h"
#include "util/u_memory.h"

#include "radeon_variable.h"

struct ra_regs;

enum rc_reg_class {
   RC_REG_CLASS_FP_SINGLE,
   RC_REG_CLASS_FP_DOUBLE,
   RC_REG_CLASS_FP_TRIPLE,
   RC_REG_CLASS_FP_ALPHA,
   RC_REG_CLASS_FP_SINGLE_PLUS_ALPHA,
   RC_REG_CLASS_FP_DOUBLE_PLUS_ALPHA,
   RC_REG_CLASS_FP_TRIPLE_PLUS_ALPHA,
   RC_REG_CLASS_FP_X,
   RC_REG_CLASS_FP_Y,
   RC_REG_CLASS_FP_Z,
   RC_REG_CLASS_FP_XY,
   RC_REG_CLASS_FP_YZ,
   RC_REG_CLASS_FP_XZ,
   RC_REG_CLASS_FP_XW,
   RC_REG_CLASS_FP_YW,
   RC_REG_CLASS_FP_ZW,
   RC_REG_CLASS_FP_XYW,
   RC_REG_CLASS_FP_YZW,
   RC_REG_CLASS_FP_XZW,
   RC_REG_CLASS_FP_COUNT
};

enum rc_reg_class_vp {
   RC_REG_CLASS_VP_SINGLE,
   RC_REG_CLASS_VP_DOUBLE,
   RC_REG_CLASS_VP_TRIPLE,
   RC_REG_CLASS_VP_QUADRUPLE,
   RC_REG_CLASS_VP_COUNT
};

struct rc_regalloc_state {
   struct ra_regs *regs;
   struct ra_class *classes[RC_REG_CLASS_FP_COUNT];
   const struct rc_class *class_list;
};

struct register_info {
   struct live_intervals Live[4];

   unsigned int Used : 1;
   unsigned int Allocated : 1;
   unsigned int File : 3;
   unsigned int Index : RC_REGISTER_INDEX_BITS;
   unsigned int Writemask;
};

struct regalloc_state {
   struct radeon_compiler *C;

   struct register_info *Input;
   unsigned int NumInputs;

   struct register_info *Temporary;
   unsigned int NumTemporaries;

   unsigned int Simple;
   int LoopEnd;
};

struct rc_class {
   enum rc_reg_class ID;

   unsigned int WritemaskCount;

   /** List of writemasks that belong to this class */
   unsigned int Writemasks[6];
};

int rc_find_class(const struct rc_class *classes, unsigned int writemask,
                  unsigned int max_writemask_count);

unsigned int rc_overlap_live_intervals_array(struct live_intervals *a, struct live_intervals *b);

static inline unsigned int
reg_get_index(int reg)
{
   return reg / RC_MASK_XYZW;
};

static inline unsigned int
reg_get_writemask(int reg)
{
   return (reg % RC_MASK_XYZW) + 1;
};

static inline int
get_reg_id(unsigned int index, unsigned int writemask)
{
   assert(writemask);
   if (writemask == 0) {
      return 0;
   }
   return (index * RC_MASK_XYZW) + (writemask - 1);
}

void rc_build_interference_graph(struct ra_graph *graph, struct rc_list *variables);

void rc_init_regalloc_state(struct rc_regalloc_state *s, enum rc_program_type prog);
void rc_destroy_regalloc_state(struct rc_regalloc_state *s);

#endif /* RADEON_REGALLOC_H */