src/panfrost/util/pan_ir.h

   1 /*
   2  * Copyright (C) 2020 Collabora, Ltd.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #ifndef __PAN_IR_H
  25 #define __PAN_IR_H
  26
  27 #include <stdint.h>
  28 #include "panfrost-job.h"
  29 #include "compiler/nir/nir.h"
  30 #include "util/u_dynarray.h"
  31 #include "util/hash_table.h"
  32
  33 /* Define the general compiler entry point */
  34
  35 #define MAX_SYSVAL_COUNT 32
  36
  37 /* Allow 2D of sysval IDs, while allowing nonparametric sysvals to equal
  38  * their class for equal comparison */
  39
  40 #define PAN_SYSVAL(type, no) (((no) << 16) | PAN_SYSVAL_##type)
  41 #define PAN_SYSVAL_TYPE(sysval) ((sysval) & 0xffff)
  42 #define PAN_SYSVAL_ID(sysval) ((sysval) >> 16)
  43
  44 /* Define some common types. We start at one for easy indexing of hash
  45  * tables internal to the compiler */
  46
  47 enum {
  48         PAN_SYSVAL_VIEWPORT_SCALE = 1,
  49         PAN_SYSVAL_VIEWPORT_OFFSET = 2,
  50         PAN_SYSVAL_TEXTURE_SIZE = 3,
  51         PAN_SYSVAL_SSBO = 4,
  52         PAN_SYSVAL_NUM_WORK_GROUPS = 5,
  53         PAN_SYSVAL_SAMPLER = 7,
  54 };
  55
  56 #define PAN_TXS_SYSVAL_ID(texidx, dim, is_array)          \
  57         ((texidx) | ((dim) << 7) | ((is_array) ? (1 << 9) : 0))
  58
  59 #define PAN_SYSVAL_ID_TO_TXS_TEX_IDX(id)        ((id) & 0x7f)
  60 #define PAN_SYSVAL_ID_TO_TXS_DIM(id)            (((id) >> 7) & 0x3)
  61 #define PAN_SYSVAL_ID_TO_TXS_IS_ARRAY(id)       !!((id) & (1 << 9))
  62
  63 /* Special attribute slots for vertex builtins. Sort of arbitrary but let's be
  64  * consistent with the blob so we can compare traces easier. */
  65
  66 enum {
  67         PAN_VERTEX_ID   = 16,
  68         PAN_INSTANCE_ID = 17,
  69         PAN_MAX_ATTRIBUTE
  70 };
  71
  72 struct panfrost_sysvals {
  73         /* The mapping of sysvals to uniforms, the count, and the off-by-one inverse */
  74         unsigned sysvals[MAX_SYSVAL_COUNT];
  75         unsigned sysval_count;
  76         struct hash_table_u64 *sysval_to_id;
  77 };
  78
  79 void
  80 panfrost_nir_assign_sysvals(struct panfrost_sysvals *ctx, nir_shader *shader);
  81
  82 int
  83 panfrost_sysval_for_instr(nir_instr *instr, nir_dest *dest);
  84
  85 typedef struct {
  86         int work_register_count;
  87         int uniform_cutoff;
  88
  89         /* For Bifrost - output type for each RT */
  90         nir_alu_type blend_types[BIFROST_MAX_RENDER_TARGET_COUNT];
  91
  92         /* Prepended before uniforms, mapping to SYSVAL_ names for the
  93          * sysval */
  94
  95         unsigned sysval_count;
  96         unsigned sysvals[MAX_SYSVAL_COUNT];
  97
  98         int first_tag;
  99
 100         struct util_dynarray compiled;
 101
 102         /* For a blend shader using a constant color -- patch point. If
 103          * negative, there's no constant. */
 104
 105         int blend_patch_offset;
 106
 107         /* The number of bytes to allocate per-thread for Thread Local Storage
 108          * (register spilling), or zero if no spilling is used */
 109         unsigned tls_size;
 110
 111         /* IN: For a fragment shader with a lowered alpha test, the ref value */
 112         float alpha_ref;
 113 } panfrost_program;
 114
 115 typedef struct pan_block {
 116         /* Link to next block. Must be first for mir_get_block */
 117         struct list_head link;
 118
 119         /* List of instructions emitted for the current block */
 120         struct list_head instructions;
 121
 122         /* Index of the block in source order */
 123         unsigned name;
 124
 125         /* Control flow graph */
 126         struct pan_block *successors[2];
 127         struct set *predecessors;
 128
 129         /* In liveness analysis, these are live masks (per-component) for
 130          * indices for the block. Scalar compilers have the luxury of using
 131          * simple bit fields, but for us, liveness is a vector idea. */
 132         uint16_t *live_in;
 133         uint16_t *live_out;
 134 } pan_block;
 135
 136 struct pan_instruction {
 137         struct list_head link;
 138 };
 139
 140 #define pan_foreach_instr_in_block_rev(block, v) \
 141         list_for_each_entry_rev(struct pan_instruction, v, &block->instructions, link)
 142
 143 #define pan_foreach_successor(blk, v) \
 144         pan_block *v; \
 145         pan_block **_v; \
 146         for (_v = (pan_block **) &blk->successors[0], \
 147                 v = *_v; \
 148                 v != NULL && _v < (pan_block **) &blk->successors[2]; \
 149                 _v++, v = *_v) \
 150
 151 #define pan_foreach_predecessor(blk, v) \
 152         struct set_entry *_entry_##v; \
 153         struct pan_block *v; \
 154         for (_entry_##v = _mesa_set_next_entry(blk->predecessors, NULL), \
 155                 v = (struct pan_block *) (_entry_##v ? _entry_##v->key : NULL);  \
 156                 _entry_##v != NULL; \
 157                 _entry_##v = _mesa_set_next_entry(blk->predecessors, _entry_##v), \
 158                 v = (struct pan_block *) (_entry_##v ? _entry_##v->key : NULL))
 159
 160 static inline pan_block *
 161 pan_exit_block(struct list_head *blocks)
 162 {
 163         pan_block *last = list_last_entry(blocks, pan_block, link);
 164         assert(!last->successors[0] && !last->successors[1]);
 165         return last;
 166 }
 167
 168 typedef void (*pan_liveness_update)(uint16_t *, void *, unsigned max);
 169
 170 void pan_liveness_gen(uint16_t *live, unsigned node, unsigned max, uint16_t mask);
 171 void pan_liveness_kill(uint16_t *live, unsigned node, unsigned max, uint16_t mask);
 172 bool pan_liveness_get(uint16_t *live, unsigned node, uint16_t max);
 173
 174 void pan_compute_liveness(struct list_head *blocks,
 175                 unsigned temp_count,
 176                 pan_liveness_update callback);
 177
 178 void pan_free_liveness(struct list_head *blocks);
 179
 180 uint16_t
 181 pan_to_bytemask(unsigned bytes, unsigned mask);
 182
 183 void pan_block_add_successor(pan_block *block, pan_block *successor);
 184
 185 /* IR indexing */
 186 #define PAN_IS_REG (1)
 187
 188 static inline unsigned
 189 pan_ssa_index(nir_ssa_def *ssa)
 190 {
 191         /* Off-by-one ensures BIR_NO_ARG is skipped */
 192         return ((ssa->index + 1) << 1) | 0;
 193 }
 194
 195 static inline unsigned
 196 pan_src_index(nir_src *src)
 197 {
 198         if (src->is_ssa)
 199                 return pan_ssa_index(src->ssa);
 200         else {
 201                 assert(!src->reg.indirect);
 202                 return (src->reg.reg->index << 1) | PAN_IS_REG;
 203         }
 204 }
 205
 206 static inline unsigned
 207 pan_dest_index(nir_dest *dst)
 208 {
 209         if (dst->is_ssa)
 210                 return pan_ssa_index(&dst->ssa);
 211         else {
 212                 assert(!dst->reg.indirect);
 213                 return (dst->reg.reg->index << 1) | PAN_IS_REG;
 214         }
 215 }
 216
 217 /* IR printing helpers */
 218 void pan_print_alu_type(nir_alu_type t, FILE *fp);
 219
 220 /* Until it can be upstreamed.. */
 221 bool pan_has_source_mod(nir_alu_src *src, nir_op op);
 222 bool pan_has_dest_mod(nir_dest **dest, nir_op op);
 223
 224 #endif