freedreno/ir3: eliminate unnecessary absneg's

[mesa.git] / src / gallium / drivers / freedreno / ir3 / ir3.h

/*
 * Copyright (c) 2013 Rob Clark <robdclark@gmail.com>
 *
 * 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.
 */

#ifndef IR3_H_
#define IR3_H_

#include <stdint.h>
#include <stdbool.h>

#include "util/u_debug.h"
#include "util/list.h"

#include "instr-a3xx.h"
#include "disasm.h"  /* TODO move 'enum shader_t' somewhere else.. */

/* low level intermediate representation of an adreno shader program */

struct ir3_compiler;
struct ir3;
struct ir3_instruction;
struct ir3_block;

struct ir3_info {
        uint32_t gpu_id;
        uint16_t sizedwords;
        uint16_t instrs_count;   /* expanded to account for rpt's */
        /* NOTE: max_reg, etc, does not include registers not touched
         * by the shader (ie. vertex fetched via VFD_DECODE but not
         * touched by shader)
         */
        int8_t   max_reg;   /* highest GPR # used by shader */
        int8_t   max_half_reg;
        int16_t  max_const;
};

struct ir3_register {
        enum {
                IR3_REG_CONST  = 0x001,
                IR3_REG_IMMED  = 0x002,
                IR3_REG_HALF   = 0x004,
                IR3_REG_RELATIV= 0x008,
                IR3_REG_R      = 0x010,
                /* Most instructions, it seems, can do float abs/neg but not
                 * integer.  The CP pass needs to know what is intended (int or
                 * float) in order to do the right thing.  For this reason the
                 * abs/neg flags are split out into float and int variants.  In
                 * addition, .b (bitwise) operations, the negate is actually a
                 * bitwise not, so split that out into a new flag to make it
                 * more clear.
                 */
                IR3_REG_FNEG   = 0x020,
                IR3_REG_FABS   = 0x040,
                IR3_REG_SNEG   = 0x080,
                IR3_REG_SABS   = 0x100,
                IR3_REG_BNOT   = 0x200,
                IR3_REG_EVEN   = 0x400,
                IR3_REG_POS_INF= 0x800,
                /* (ei) flag, end-input?  Set on last bary, presumably to signal
                 * that the shader needs no more input:
                 */
                IR3_REG_EI     = 0x1000,
                /* meta-flags, for intermediate stages of IR, ie.
                 * before register assignment is done:
                 */
                IR3_REG_SSA    = 0x2000,   /* 'instr' is ptr to assigning instr */
                IR3_REG_ARRAY  = 0x4000,
                IR3_REG_PHI_SRC= 0x8000,   /* phi src, regs[0]->instr points to phi */

        } flags;
        union {
                /* normal registers:
                 * the component is in the low two bits of the reg #, so
                 * rN.x becomes: (N << 2) | x
                 */
                int   num;
                /* immediate: */
                int32_t  iim_val;
                uint32_t uim_val;
                float    fim_val;
                /* relative: */
                struct {
                        uint16_t id;
                        int16_t offset;
                } array;
        };

        /* For IR3_REG_SSA, src registers contain ptr back to assigning
         * instruction.
         *
         * For IR3_REG_ARRAY, the pointer is back to the last dependent
         * array access (although the net effect is the same, it points
         * back to a previous instruction that we depend on).
         */
        struct ir3_instruction *instr;

        union {
                /* used for cat5 instructions, but also for internal/IR level
                 * tracking of what registers are read/written by an instruction.
                 * wrmask may be a bad name since it is used to represent both
                 * src and dst that touch multiple adjacent registers.
                 */
                unsigned wrmask;
                /* for relative addressing, 32bits for array size is too small,
                 * but otoh we don't need to deal with disjoint sets, so instead
                 * use a simple size field (number of scalar components).
                 */
                unsigned size;
        };
};

struct ir3_instruction {
        struct ir3_block *block;
        opc_t opc;
        enum {
                /* (sy) flag is set on first instruction, and after sample
                 * instructions (probably just on RAW hazard).
                 */
                IR3_INSTR_SY    = 0x001,
                /* (ss) flag is set on first instruction, and first instruction
                 * to depend on the result of "long" instructions (RAW hazard):
                 *
                 *   rcp, rsq, log2, exp2, sin, cos, sqrt
                 *
                 * It seems to synchronize until all in-flight instructions are
                 * completed, for example:
                 *
                 *   rsq hr1.w, hr1.w
                 *   add.f hr2.z, (neg)hr2.z, hc0.y
                 *   mul.f hr2.w, (neg)hr2.y, (neg)hr2.y
                 *   rsq hr2.x, hr2.x
                 *   (rpt1)nop
                 *   mad.f16 hr2.w, hr2.z, hr2.z, hr2.w
                 *   nop
                 *   mad.f16 hr2.w, (neg)hr0.w, (neg)hr0.w, hr2.w
                 *   (ss)(rpt2)mul.f hr1.x, (r)hr1.x, hr1.w
                 *   (rpt2)mul.f hr0.x, (neg)(r)hr0.x, hr2.x
                 *
                 * The last mul.f does not have (ss) set, presumably because the
                 * (ss) on the previous instruction does the job.
                 *
                 * The blob driver also seems to set it on WAR hazards, although
                 * not really clear if this is needed or just blob compiler being
                 * sloppy.  So far I haven't found a case where removing the (ss)
                 * causes problems for WAR hazard, but I could just be getting
                 * lucky:
                 *
                 *   rcp r1.y, r3.y
                 *   (ss)(rpt2)mad.f32 r3.y, (r)c9.x, r1.x, (r)r3.z
                 *
                 */
                IR3_INSTR_SS    = 0x002,
                /* (jp) flag is set on jump targets:
                 */
                IR3_INSTR_JP    = 0x004,
                IR3_INSTR_UL    = 0x008,
                IR3_INSTR_3D    = 0x010,
                IR3_INSTR_A     = 0x020,
                IR3_INSTR_O     = 0x040,
                IR3_INSTR_P     = 0x080,
                IR3_INSTR_S     = 0x100,
                IR3_INSTR_S2EN  = 0x200,
                IR3_INSTR_G     = 0x400,
                /* meta-flags, for intermediate stages of IR, ie.
                 * before register assignment is done:
                 */
                IR3_INSTR_MARK  = 0x1000,
                IR3_INSTR_UNUSED= 0x2000,
        } flags;
        int repeat;
#ifdef DEBUG
        unsigned regs_max;
#endif
        unsigned regs_count;
        struct ir3_register **regs;
        union {
                struct {
                        char inv;
                        char comp;
                        int  immed;
                        struct ir3_block *target;
                } cat0;
                struct {
                        type_t src_type, dst_type;
                } cat1;
                struct {
                        enum {
                                IR3_COND_LT = 0,
                                IR3_COND_LE = 1,
                                IR3_COND_GT = 2,
                                IR3_COND_GE = 3,
                                IR3_COND_EQ = 4,
                                IR3_COND_NE = 5,
                        } condition;
                } cat2;
                struct {
                        unsigned samp, tex;
                        type_t type;
                } cat5;
                struct {
                        type_t type;
                        int src_offset;
                        int dst_offset;
                        int iim_val;
                } cat6;
                /* for meta-instructions, just used to hold extra data
                 * before instruction scheduling, etc
                 */
                struct {
                        int off;              /* component/offset */
                } fo;
                struct {
                        /* used to temporarily hold reference to nir_phi_instr
                         * until we resolve the phi srcs
                         */
                        void *nphi;
                } phi;
                struct {
                        struct ir3_block *block;
                } inout;
        };

        /* transient values used during various algorithms: */
        union {
                /* The instruction depth is the max dependency distance to output.
                 *
                 * You can also think of it as the "cost", if we did any sort of
                 * optimization for register footprint.  Ie. a value that is  just
                 * result of moving a const to a reg would have a low cost,  so to
                 * it could make sense to duplicate the instruction at various
                 * points where the result is needed to reduce register footprint.
                 */
                unsigned depth;
                /* When we get to the RA stage, we no longer need depth, but
                 * we do need instruction's position/name:
                 */
                struct {
                        uint16_t ip;
                        uint16_t name;
                };
        };

        /* used for per-pass extra instruction data.
         */
        void *data;

        /* Used during CP and RA stages.  For fanin and shader inputs/
         * outputs where we need a sequence of consecutive registers,
         * keep track of each src instructions left (ie 'n-1') and right
         * (ie 'n+1') neighbor.  The front-end must insert enough mov's
         * to ensure that each instruction has at most one left and at
         * most one right neighbor.  During the copy-propagation pass,
         * we only remove mov's when we can preserve this constraint.
         * And during the RA stage, we use the neighbor information to
         * allocate a block of registers in one shot.
         *
         * TODO: maybe just add something like:
         *   struct ir3_instruction_ref {
         *       struct ir3_instruction *instr;
         *       unsigned cnt;
         *   }
         *
         * Or can we get away without the refcnt stuff?  It seems like
         * it should be overkill..  the problem is if, potentially after
         * already eliminating some mov's, if you have a single mov that
         * needs to be grouped with it's neighbors in two different
         * places (ex. shader output and a fanin).
         */
        struct {
                struct ir3_instruction *left, *right;
                uint16_t left_cnt, right_cnt;
        } cp;

        /* an instruction can reference at most one address register amongst
         * it's src/dst registers.  Beyond that, you need to insert mov's.
         *
         * NOTE: do not write this directly, use ir3_instr_set_address()
         */
        struct ir3_instruction *address;

        /* Entry in ir3_block's instruction list: */
        struct list_head node;

#ifdef DEBUG
        uint32_t serialno;
#endif
};

static inline struct ir3_instruction *
ir3_neighbor_first(struct ir3_instruction *instr)
{
        while (instr->cp.left)
                instr = instr->cp.left;
        return instr;
}

static inline int ir3_neighbor_count(struct ir3_instruction *instr)
{
        int num = 1;

        debug_assert(!instr->cp.left);

        while (instr->cp.right) {
                num++;
                instr = instr->cp.right;
        }

        return num;
}

struct ir3_heap_chunk;

struct ir3 {
        struct ir3_compiler *compiler;

        unsigned ninputs, noutputs;
        struct ir3_instruction **inputs;
        struct ir3_instruction **outputs;

        /* Track bary.f (and ldlv) instructions.. this is needed in
         * scheduling to ensure that all varying fetches happen before
         * any potential kill instructions.  The hw gets grumpy if all
         * threads in a group are killed before the last bary.f gets
         * a chance to signal end of input (ei).
         */
        unsigned baryfs_count, baryfs_sz;
        struct ir3_instruction **baryfs;

        /* Track all indirect instructions (read and write).  To avoid
         * deadlock scenario where an address register gets scheduled,
         * but other dependent src instructions cannot be scheduled due
         * to dependency on a *different* address register value, the
         * scheduler needs to ensure that all dependencies other than
         * the instruction other than the address register are scheduled
         * before the one that writes the address register.  Having a
         * convenient list of instructions that reference some address
         * register simplifies this.
         */
        unsigned indirects_count, indirects_sz;
        struct ir3_instruction **indirects;
        /* and same for instructions that consume predicate register: */
        unsigned predicates_count, predicates_sz;
        struct ir3_instruction **predicates;

        /* Track instructions which do not write a register but other-
         * wise must not be discarded (such as kill, stg, etc)
         */
        unsigned keeps_count, keeps_sz;
        struct ir3_instruction **keeps;

        /* List of blocks: */
        struct list_head block_list;

        /* List of ir3_array's: */
        struct list_head array_list;

        unsigned heap_idx;
        struct ir3_heap_chunk *chunk;
};

typedef struct nir_variable nir_variable;

struct ir3_array {
        struct list_head node;
        unsigned length;
        unsigned id;

        nir_variable *var;

        /* We track the last write and last access (read or write) to
         * setup dependencies on instructions that read or write the
         * array.  Reads can be re-ordered wrt. other reads, but should
         * not be re-ordered wrt. to writes.  Writes cannot be reordered
         * wrt. any other access to the array.
         *
         * So array reads depend on last write, and array writes depend
         * on the last access.
         */
        struct ir3_instruction *last_write, *last_access;

        /* extra stuff used in RA pass: */
        unsigned base;      /* base vreg name */
        unsigned reg;       /* base physical reg */
        uint16_t start_ip, end_ip;
};

struct ir3_array * ir3_lookup_array(struct ir3 *ir, unsigned id);

typedef struct nir_block nir_block;

struct ir3_block {
        struct list_head node;
        struct ir3 *shader;

        nir_block *nblock;

        struct list_head instr_list;  /* list of ir3_instruction */

        /* each block has either one or two successors.. in case of
         * two successors, 'condition' decides which one to follow.
         * A block preceding an if/else has two successors.
         */
        struct ir3_instruction *condition;
        struct ir3_block *successors[2];

        uint16_t start_ip, end_ip;

        /* used for per-pass extra block data.  Mainly used right
         * now in RA step to track livein/liveout.
         */
        void *data;

#ifdef DEBUG
        uint32_t serialno;
#endif
};

static inline uint32_t
block_id(struct ir3_block *block)
{
#ifdef DEBUG
        return block->serialno;
#else
        return (uint32_t)(unsigned long)block;
#endif
}

struct ir3 * ir3_create(struct ir3_compiler *compiler,
                unsigned nin, unsigned nout);
void ir3_destroy(struct ir3 *shader);
void * ir3_assemble(struct ir3 *shader,
                struct ir3_info *info, uint32_t gpu_id);
void * ir3_alloc(struct ir3 *shader, int sz);

struct ir3_block * ir3_block_create(struct ir3 *shader);

struct ir3_instruction * ir3_instr_create(struct ir3_block *block, opc_t opc);
struct ir3_instruction * ir3_instr_create2(struct ir3_block *block,
                opc_t opc, int nreg);
struct ir3_instruction * ir3_instr_clone(struct ir3_instruction *instr);
const char *ir3_instr_name(struct ir3_instruction *instr);

struct ir3_register * ir3_reg_create(struct ir3_instruction *instr,
                int num, int flags);
struct ir3_register * ir3_reg_clone(struct ir3 *shader,
                struct ir3_register *reg);

void ir3_instr_set_address(struct ir3_instruction *instr,
                struct ir3_instruction *addr);

static inline bool ir3_instr_check_mark(struct ir3_instruction *instr)
{
        if (instr->flags & IR3_INSTR_MARK)
                return true;  /* already visited */
        instr->flags |= IR3_INSTR_MARK;
        return false;
}

void ir3_block_clear_mark(struct ir3_block *block);
void ir3_clear_mark(struct ir3 *shader);

unsigned ir3_count_instructions(struct ir3 *ir);

static inline int ir3_instr_regno(struct ir3_instruction *instr,
                struct ir3_register *reg)
{
        unsigned i;
        for (i = 0; i < instr->regs_count; i++)
                if (reg == instr->regs[i])
                        return i;
        return -1;
}


#define MAX_ARRAYS 16

/* comp:
 *   0 - x
 *   1 - y
 *   2 - z
 *   3 - w
 */
static inline uint32_t regid(int num, int comp)
{
        return (num << 2) | (comp & 0x3);
}

static inline uint32_t reg_num(struct ir3_register *reg)
{
        return reg->num >> 2;
}

static inline uint32_t reg_comp(struct ir3_register *reg)
{
        return reg->num & 0x3;
}

static inline bool is_flow(struct ir3_instruction *instr)
{
        return (opc_cat(instr->opc) == 0);
}

static inline bool is_kill(struct ir3_instruction *instr)
{
        return instr->opc == OPC_KILL;
}

static inline bool is_nop(struct ir3_instruction *instr)
{
        return instr->opc == OPC_NOP;
}

/* Is it a non-transformative (ie. not type changing) mov?  This can
 * also include absneg.s/absneg.f, which for the most part can be
 * treated as a mov (single src argument).
 */
static inline bool is_same_type_mov(struct ir3_instruction *instr)
{
        struct ir3_register *dst = instr->regs[0];

        /* mov's that write to a0.x or p0.x are special: */
        if (dst->num == regid(REG_P0, 0))
                return false;
        if (dst->num == regid(REG_A0, 0))
                return false;

        if (dst->flags & (IR3_REG_RELATIV | IR3_REG_ARRAY))
                return false;

        switch (instr->opc) {
        case OPC_MOV:
                return instr->cat1.src_type == instr->cat1.dst_type;
        case OPC_ABSNEG_F:
        case OPC_ABSNEG_S:
                return true;
        default:
                return false;
        }
}

static inline bool is_alu(struct ir3_instruction *instr)
{
        return (1 <= opc_cat(instr->opc)) && (opc_cat(instr->opc) <= 3);
}

static inline bool is_sfu(struct ir3_instruction *instr)
{
        return (opc_cat(instr->opc) == 4);
}

static inline bool is_tex(struct ir3_instruction *instr)
{
        return (opc_cat(instr->opc) == 5);
}

static inline bool is_mem(struct ir3_instruction *instr)
{
        return (opc_cat(instr->opc) == 6);
}

static inline bool
is_store(struct ir3_instruction *instr)
{
        /* these instructions, the "destination" register is
         * actually a source, the address to store to.
         */
        switch (instr->opc) {
        case OPC_STG:
        case OPC_STP:
        case OPC_STL:
        case OPC_STLW:
        case OPC_L2G:
        case OPC_G2L:
                return true;
        default:
                return false;
        }
}

static inline bool is_load(struct ir3_instruction *instr)
{
        switch (instr->opc) {
        case OPC_LDG:
        case OPC_LDL:
        case OPC_LDP:
        case OPC_L2G:
        case OPC_LDLW:
        case OPC_LDC_4:
        case OPC_LDLV:
                /* probably some others too.. */
                return true;
        default:
                return false;
        }
}

static inline bool is_input(struct ir3_instruction *instr)
{
        /* in some cases, ldlv is used to fetch varying without
         * interpolation.. fortunately inloc is the first src
         * register in either case
         */
        switch (instr->opc) {
        case OPC_LDLV:
        case OPC_BARY_F:
                return true;
        default:
                return false;
        }
}

static inline bool is_bool(struct ir3_instruction *instr)
{
        switch (instr->opc) {
        case OPC_CMPS_F:
        case OPC_CMPS_S:
        case OPC_CMPS_U:
                return true;
        default:
                return false;
        }
}

static inline bool is_meta(struct ir3_instruction *instr)
{
        /* TODO how should we count PHI (and maybe fan-in/out) which
         * might actually contribute some instructions to the final
         * result?
         */
        return (opc_cat(instr->opc) == -1);
}

static inline bool writes_addr(struct ir3_instruction *instr)
{
        if (instr->regs_count > 0) {
                struct ir3_register *dst = instr->regs[0];
                return reg_num(dst) == REG_A0;
        }
        return false;
}

static inline bool writes_pred(struct ir3_instruction *instr)
{
        if (instr->regs_count > 0) {
                struct ir3_register *dst = instr->regs[0];
                return reg_num(dst) == REG_P0;
        }
        return false;
}

/* returns defining instruction for reg */
/* TODO better name */
static inline struct ir3_instruction *ssa(struct ir3_register *reg)
{
        if (reg->flags & (IR3_REG_SSA | IR3_REG_ARRAY)) {
                debug_assert(!(reg->instr && (reg->instr->flags & IR3_INSTR_UNUSED)));
                return reg->instr;
        }
        return NULL;
}

static inline bool conflicts(struct ir3_instruction *a,
                struct ir3_instruction *b)
{
        return (a && b) && (a != b);
}

static inline bool reg_gpr(struct ir3_register *r)
{
        if (r->flags & (IR3_REG_CONST | IR3_REG_IMMED))
                return false;
        if ((reg_num(r) == REG_A0) || (reg_num(r) == REG_P0))
                return false;
        return true;
}

static inline type_t half_type(type_t type)
{
        switch (type) {
        case TYPE_F32: return TYPE_F16;
        case TYPE_U32: return TYPE_U16;
        case TYPE_S32: return TYPE_S16;
        case TYPE_F16:
        case TYPE_U16:
        case TYPE_S16:
                return type;
        default:
                assert(0);
                return ~0;
        }
}

/* some cat2 instructions (ie. those which are not float) can embed an
 * immediate:
 */
static inline bool ir3_cat2_int(opc_t opc)
{
        switch (opc) {
        case OPC_ADD_U:
        case OPC_ADD_S:
        case OPC_SUB_U:
        case OPC_SUB_S:
        case OPC_CMPS_U:
        case OPC_CMPS_S:
        case OPC_MIN_U:
        case OPC_MIN_S:
        case OPC_MAX_U:
        case OPC_MAX_S:
        case OPC_CMPV_U:
        case OPC_CMPV_S:
        case OPC_MUL_U:
        case OPC_MUL_S:
        case OPC_MULL_U:
        case OPC_CLZ_S:
        case OPC_ABSNEG_S:
        case OPC_AND_B:
        case OPC_OR_B:
        case OPC_NOT_B:
        case OPC_XOR_B:
        case OPC_BFREV_B:
        case OPC_CLZ_B:
        case OPC_SHL_B:
        case OPC_SHR_B:
        case OPC_ASHR_B:
        case OPC_MGEN_B:
        case OPC_GETBIT_B:
        case OPC_CBITS_B:
        case OPC_BARY_F:
                return true;

        default:
                return false;
        }
}


/* map cat2 instruction to valid abs/neg flags: */
static inline unsigned ir3_cat2_absneg(opc_t opc)
{
        switch (opc) {
        case OPC_ADD_F:
        case OPC_MIN_F:
        case OPC_MAX_F:
        case OPC_MUL_F:
        case OPC_SIGN_F:
        case OPC_CMPS_F:
        case OPC_ABSNEG_F:
        case OPC_CMPV_F:
        case OPC_FLOOR_F:
        case OPC_CEIL_F:
        case OPC_RNDNE_F:
        case OPC_RNDAZ_F:
        case OPC_TRUNC_F:
        case OPC_BARY_F:
                return IR3_REG_FABS | IR3_REG_FNEG;

        case OPC_ADD_U:
        case OPC_ADD_S:
        case OPC_SUB_U:
        case OPC_SUB_S:
        case OPC_CMPS_U:
        case OPC_CMPS_S:
        case OPC_MIN_U:
        case OPC_MIN_S:
        case OPC_MAX_U:
        case OPC_MAX_S:
        case OPC_CMPV_U:
        case OPC_CMPV_S:
        case OPC_MUL_U:
        case OPC_MUL_S:
        case OPC_MULL_U:
        case OPC_CLZ_S:
                return 0;

        case OPC_ABSNEG_S:
                return IR3_REG_SABS | IR3_REG_SNEG;

        case OPC_AND_B:
        case OPC_OR_B:
        case OPC_NOT_B:
        case OPC_XOR_B:
        case OPC_BFREV_B:
        case OPC_CLZ_B:
        case OPC_SHL_B:
        case OPC_SHR_B:
        case OPC_ASHR_B:
        case OPC_MGEN_B:
        case OPC_GETBIT_B:
        case OPC_CBITS_B:
                return IR3_REG_BNOT;

        default:
                return 0;
        }
}

/* map cat3 instructions to valid abs/neg flags: */
static inline unsigned ir3_cat3_absneg(opc_t opc)
{
        switch (opc) {
        case OPC_MAD_F16:
        case OPC_MAD_F32:
        case OPC_SEL_F16:
        case OPC_SEL_F32:
                return IR3_REG_FNEG;

        case OPC_MAD_U16:
        case OPC_MADSH_U16:
        case OPC_MAD_S16:
        case OPC_MADSH_M16:
        case OPC_MAD_U24:
        case OPC_MAD_S24:
        case OPC_SEL_S16:
        case OPC_SEL_S32:
        case OPC_SAD_S16:
        case OPC_SAD_S32:
                /* neg *may* work on 3rd src.. */

        case OPC_SEL_B16:
        case OPC_SEL_B32:

        default:
                return 0;
        }
}

#define array_insert(arr, val) do { \
                if (arr ## _count == arr ## _sz) { \
                        arr ## _sz = MAX2(2 * arr ## _sz, 16); \
                        arr = realloc(arr, arr ## _sz * sizeof(arr[0])); \
                } \
                arr[arr ##_count++] = val; \
        } while (0)

/* iterator for an instructions's sources (reg), also returns src #: */
#define foreach_src_n(__srcreg, __n, __instr) \
        if ((__instr)->regs_count) \
                for (unsigned __cnt = (__instr)->regs_count - 1, __n = 0; __n < __cnt; __n++) \
                        if ((__srcreg = (__instr)->regs[__n + 1]))

/* iterator for an instructions's sources (reg): */
#define foreach_src(__srcreg, __instr) \
        foreach_src_n(__srcreg, __i, __instr)

static inline unsigned __ssa_src_cnt(struct ir3_instruction *instr)
{
        if (instr->address)
                return instr->regs_count + 1;
        return instr->regs_count;
}

static inline struct ir3_instruction * __ssa_src_n(struct ir3_instruction *instr, unsigned n)
{
        if (n == (instr->regs_count + 0))
                return instr->address;
        return ssa(instr->regs[n]);
}

#define __src_cnt(__instr) ((__instr)->address ? (__instr)->regs_count : (__instr)->regs_count - 1)

/* iterator for an instruction's SSA sources (instr), also returns src #: */
#define foreach_ssa_src_n(__srcinst, __n, __instr) \
        if ((__instr)->regs_count) \
                for (unsigned __cnt = __ssa_src_cnt(__instr), __n = 0; __n < __cnt; __n++) \
                        if ((__srcinst = __ssa_src_n(__instr, __n)))

/* iterator for an instruction's SSA sources (instr): */
#define foreach_ssa_src(__srcinst, __instr) \
        foreach_ssa_src_n(__srcinst, __i, __instr)


/* dump: */
void ir3_print(struct ir3 *ir);
void ir3_print_instr(struct ir3_instruction *instr);

/* depth calculation: */
int ir3_delayslots(struct ir3_instruction *assigner,
                struct ir3_instruction *consumer, unsigned n);
void ir3_insert_by_depth(struct ir3_instruction *instr, struct list_head *list);
void ir3_depth(struct ir3 *ir);

/* copy-propagate: */
void ir3_cp(struct ir3 *ir);

/* group neighbors and insert mov's to resolve conflicts: */
void ir3_group(struct ir3 *ir);

/* scheduling: */
int ir3_sched(struct ir3 *ir);

/* register assignment: */
struct ir3_ra_reg_set * ir3_ra_alloc_reg_set(void *memctx);
int ir3_ra(struct ir3 *ir3, enum shader_t type,
                bool frag_coord, bool frag_face);

/* legalize: */
void ir3_legalize(struct ir3 *ir, bool *has_samp, int *max_bary);

/* ************************************************************************* */
/* instruction helpers */

static inline struct ir3_instruction *
ir3_MOV(struct ir3_block *block, struct ir3_instruction *src, type_t type)
{
        struct ir3_instruction *instr = ir3_instr_create(block, OPC_MOV);
        ir3_reg_create(instr, 0, 0);   /* dst */
        if (src->regs[0]->flags & IR3_REG_ARRAY) {
                struct ir3_register *src_reg =
                        ir3_reg_create(instr, 0, IR3_REG_ARRAY);
                src_reg->array = src->regs[0]->array;
                src_reg->instr = src;
        } else {
                ir3_reg_create(instr, 0, IR3_REG_SSA)->instr = src;
        }
        debug_assert(!(src->regs[0]->flags & IR3_REG_RELATIV));
        instr->cat1.src_type = type;
        instr->cat1.dst_type = type;
        return instr;
}

static inline struct ir3_instruction *
ir3_COV(struct ir3_block *block, struct ir3_instruction *src,
                type_t src_type, type_t dst_type)
{
        struct ir3_instruction *instr = ir3_instr_create(block, OPC_MOV);
        ir3_reg_create(instr, 0, 0);   /* dst */
        ir3_reg_create(instr, 0, IR3_REG_SSA)->instr = src;
        instr->cat1.src_type = src_type;
        instr->cat1.dst_type = dst_type;
        debug_assert(!(src->regs[0]->flags & IR3_REG_ARRAY));
        return instr;
}

static inline struct ir3_instruction *
ir3_NOP(struct ir3_block *block)
{
        return ir3_instr_create(block, OPC_NOP);
}

#define INSTR0(name)                                                     \
static inline struct ir3_instruction *                                   \
ir3_##name(struct ir3_block *block)                                      \
{                                                                        \
        struct ir3_instruction *instr =                                      \
                ir3_instr_create(block, OPC_##name);                             \
        return instr;                                                        \
}

#define INSTR1(name)                                                     \
static inline struct ir3_instruction *                                   \
ir3_##name(struct ir3_block *block,                                      \
                struct ir3_instruction *a, unsigned aflags)                      \
{                                                                        \
        struct ir3_instruction *instr =                                      \
                ir3_instr_create(block, OPC_##name);                             \
        ir3_reg_create(instr, 0, 0);   /* dst */                             \
        ir3_reg_create(instr, 0, IR3_REG_SSA | aflags)->instr = a;           \
        return instr;                                                        \
}

#define INSTR2(name)                                                     \
static inline struct ir3_instruction *                                   \
ir3_##name(struct ir3_block *block,                                      \
                struct ir3_instruction *a, unsigned aflags,                      \
                struct ir3_instruction *b, unsigned bflags)                      \
{                                                                        \
        struct ir3_instruction *instr =                                      \
                ir3_instr_create(block, OPC_##name);                             \
        ir3_reg_create(instr, 0, 0);   /* dst */                             \
        ir3_reg_create(instr, 0, IR3_REG_SSA | aflags)->instr = a;           \
        ir3_reg_create(instr, 0, IR3_REG_SSA | bflags)->instr = b;           \
        return instr;                                                        \
}

#define INSTR3(name)                                                     \
static inline struct ir3_instruction *                                   \
ir3_##name(struct ir3_block *block,                                      \
                struct ir3_instruction *a, unsigned aflags,                      \
                struct ir3_instruction *b, unsigned bflags,                      \
                struct ir3_instruction *c, unsigned cflags)                      \
{                                                                        \
        struct ir3_instruction *instr =                                      \
                ir3_instr_create(block, OPC_##name);                             \
        ir3_reg_create(instr, 0, 0);   /* dst */                             \
        ir3_reg_create(instr, 0, IR3_REG_SSA | aflags)->instr = a;           \
        ir3_reg_create(instr, 0, IR3_REG_SSA | bflags)->instr = b;           \
        ir3_reg_create(instr, 0, IR3_REG_SSA | cflags)->instr = c;           \
        return instr;                                                        \
}

/* cat0 instructions: */
INSTR0(BR);
INSTR0(JUMP);
INSTR1(KILL);
INSTR0(END);

/* cat2 instructions, most 2 src but some 1 src: */
INSTR2(ADD_F)
INSTR2(MIN_F)
INSTR2(MAX_F)
INSTR2(MUL_F)
INSTR1(SIGN_F)
INSTR2(CMPS_F)
INSTR1(ABSNEG_F)
INSTR2(CMPV_F)
INSTR1(FLOOR_F)
INSTR1(CEIL_F)
INSTR1(RNDNE_F)
INSTR1(RNDAZ_F)
INSTR1(TRUNC_F)
INSTR2(ADD_U)
INSTR2(ADD_S)
INSTR2(SUB_U)
INSTR2(SUB_S)
INSTR2(CMPS_U)
INSTR2(CMPS_S)
INSTR2(MIN_U)
INSTR2(MIN_S)
INSTR2(MAX_U)
INSTR2(MAX_S)
INSTR1(ABSNEG_S)
INSTR2(AND_B)
INSTR2(OR_B)
INSTR1(NOT_B)
INSTR2(XOR_B)
INSTR2(CMPV_U)
INSTR2(CMPV_S)
INSTR2(MUL_U)
INSTR2(MUL_S)
INSTR2(MULL_U)
INSTR1(BFREV_B)
INSTR1(CLZ_S)
INSTR1(CLZ_B)
INSTR2(SHL_B)
INSTR2(SHR_B)
INSTR2(ASHR_B)
INSTR2(BARY_F)
INSTR2(MGEN_B)
INSTR2(GETBIT_B)
INSTR1(SETRM)
INSTR1(CBITS_B)
INSTR2(SHB)
INSTR2(MSAD)

/* cat3 instructions: */
INSTR3(MAD_U16)
INSTR3(MADSH_U16)
INSTR3(MAD_S16)
INSTR3(MADSH_M16)
INSTR3(MAD_U24)
INSTR3(MAD_S24)
INSTR3(MAD_F16)
INSTR3(MAD_F32)
INSTR3(SEL_B16)
INSTR3(SEL_B32)
INSTR3(SEL_S16)
INSTR3(SEL_S32)
INSTR3(SEL_F16)
INSTR3(SEL_F32)
INSTR3(SAD_S16)
INSTR3(SAD_S32)

/* cat4 instructions: */
INSTR1(RCP)
INSTR1(RSQ)
INSTR1(LOG2)
INSTR1(EXP2)
INSTR1(SIN)
INSTR1(COS)
INSTR1(SQRT)

/* cat5 instructions: */
INSTR1(DSX)
INSTR1(DSY)

static inline struct ir3_instruction *
ir3_SAM(struct ir3_block *block, opc_t opc, type_t type,
                unsigned wrmask, unsigned flags, unsigned samp, unsigned tex,
                struct ir3_instruction *src0, struct ir3_instruction *src1)
{
        struct ir3_instruction *sam;
        struct ir3_register *reg;

        sam = ir3_instr_create(block, opc);
        sam->flags |= flags;
        ir3_reg_create(sam, 0, 0)->wrmask = wrmask;
        if (src0) {
                reg = ir3_reg_create(sam, 0, IR3_REG_SSA);
                reg->wrmask = (1 << (src0->regs_count - 1)) - 1;
                reg->instr = src0;
        }
        if (src1) {
                reg = ir3_reg_create(sam, 0, IR3_REG_SSA);
                reg->instr = src1;
                reg->wrmask = (1 << (src1->regs_count - 1)) - 1;
        }
        sam->cat5.samp = samp;
        sam->cat5.tex  = tex;
        sam->cat5.type  = type;

        return sam;
}

/* cat6 instructions: */
INSTR2(LDLV)
INSTR2(LDG)
INSTR3(STG)

/* ************************************************************************* */
/* split this out or find some helper to use.. like main/bitset.h.. */

#include <string.h>

#define MAX_REG 256

typedef uint8_t regmask_t[2 * MAX_REG / 8];

static inline unsigned regmask_idx(struct ir3_register *reg)
{
        unsigned num = (reg->flags & IR3_REG_RELATIV) ? reg->array.offset : reg->num;
        debug_assert(num < MAX_REG);
        if (reg->flags & IR3_REG_HALF)
                num += MAX_REG;
        return num;
}

static inline void regmask_init(regmask_t *regmask)
{
        memset(regmask, 0, sizeof(*regmask));
}

static inline void regmask_set(regmask_t *regmask, struct ir3_register *reg)
{
        unsigned idx = regmask_idx(reg);
        if (reg->flags & IR3_REG_RELATIV) {
                unsigned i;
                for (i = 0; i < reg->size; i++, idx++)
                        (*regmask)[idx / 8] |= 1 << (idx % 8);
        } else {
                unsigned mask;
                for (mask = reg->wrmask; mask; mask >>= 1, idx++)
                        if (mask & 1)
                                (*regmask)[idx / 8] |= 1 << (idx % 8);
        }
}

static inline void regmask_or(regmask_t *dst, regmask_t *a, regmask_t *b)
{
        unsigned i;
        for (i = 0; i < ARRAY_SIZE(*dst); i++)
                (*dst)[i] = (*a)[i] | (*b)[i];
}

/* set bits in a if not set in b, conceptually:
 *   a |= (reg & ~b)
 */
static inline void regmask_set_if_not(regmask_t *a,
                struct ir3_register *reg, regmask_t *b)
{
        unsigned idx = regmask_idx(reg);
        if (reg->flags & IR3_REG_RELATIV) {
                unsigned i;
                for (i = 0; i < reg->size; i++, idx++)
                        if (!((*b)[idx / 8] & (1 << (idx % 8))))
                                (*a)[idx / 8] |= 1 << (idx % 8);
        } else {
                unsigned mask;
                for (mask = reg->wrmask; mask; mask >>= 1, idx++)
                        if (mask & 1)
                                if (!((*b)[idx / 8] & (1 << (idx % 8))))
                                        (*a)[idx / 8] |= 1 << (idx % 8);
        }
}

static inline bool regmask_get(regmask_t *regmask,
                struct ir3_register *reg)
{
        unsigned idx = regmask_idx(reg);
        if (reg->flags & IR3_REG_RELATIV) {
                unsigned i;
                for (i = 0; i < reg->size; i++, idx++)
                        if ((*regmask)[idx / 8] & (1 << (idx % 8)))
                                return true;
        } else {
                unsigned mask;
                for (mask = reg->wrmask; mask; mask >>= 1, idx++)
                        if (mask & 1)
                                if ((*regmask)[idx / 8] & (1 << (idx % 8)))
                                        return true;
        }
        return false;
}

/* ************************************************************************* */

#endif /* IR3_H_ */