src/gallium/drivers/i965/brw_eu.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a copy of this software and associated documentation files (the
   8  "Software"), to deal in the Software without restriction, including
   9  without limitation the rights to use, copy, modify, merge, publish,
  10  distribute, sublicense, and/or sell copies of the Software, and to
  11  permit persons to whom the Software is furnished to do so, subject to
  12  the following conditions:
  13
  14  The above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32 #include "util/u_memory.h"
  33
  34 #include "brw_context.h"
  35 #include "brw_defines.h"
  36 #include "brw_eu.h"
  37
  38
  39
  40 /* How does predicate control work when execution_size != 8?  Do I
  41  * need to test/set for 0xffff when execution_size is 16?
  42  */
  43 void brw_set_predicate_control_flag_value( struct brw_compile *p, GLuint value )
  44 {
  45    p->current->header.predicate_control = BRW_PREDICATE_NONE;
  46
  47    if (value != 0xff) {
  48       if (value != p->flag_value) {
  49          brw_push_insn_state(p);
  50          brw_MOV(p, brw_flag_reg(), brw_imm_uw(value));
  51          p->flag_value = value;
  52          brw_pop_insn_state(p);
  53       }
  54
  55       p->current->header.predicate_control = BRW_PREDICATE_NORMAL;
  56    }
  57 }
  58
  59 void brw_set_predicate_control( struct brw_compile *p, GLuint pc )
  60 {
  61    p->current->header.predicate_control = pc;
  62 }
  63
  64 void brw_set_conditionalmod( struct brw_compile *p, GLuint conditional )
  65 {
  66    p->current->header.destreg__conditionalmod = conditional;
  67 }
  68
  69 void brw_set_access_mode( struct brw_compile *p, GLuint access_mode )
  70 {
  71    p->current->header.access_mode = access_mode;
  72 }
  73
  74 void brw_set_compression_control( struct brw_compile *p, GLboolean compression_control )
  75 {
  76    p->current->header.compression_control = compression_control;
  77 }
  78
  79 void brw_set_mask_control( struct brw_compile *p, GLuint value )
  80 {
  81    p->current->header.mask_control = value;
  82 }
  83
  84 void brw_set_saturate( struct brw_compile *p, GLuint value )
  85 {
  86    p->current->header.saturate = value;
  87 }
  88
  89 void brw_push_insn_state( struct brw_compile *p )
  90 {
  91    assert(p->current != &p->stack[BRW_EU_MAX_INSN_STACK-1]);
  92    memcpy(p->current+1, p->current, sizeof(struct brw_instruction));
  93    p->current++;
  94 }
  95
  96 void brw_pop_insn_state( struct brw_compile *p )
  97 {
  98    assert(p->current != p->stack);
  99    p->current--;
 100 }
 101
 102
 103 /***********************************************************************
 104  */
 105 void brw_init_compile( struct brw_context *brw, struct brw_compile *p )
 106 {
 107    p->brw = brw;
 108    p->nr_insn = 0;
 109    p->current = p->stack;
 110    memset(p->current, 0, sizeof(p->current[0]));
 111
 112    /* Some defaults?
 113     */
 114    brw_set_mask_control(p, BRW_MASK_ENABLE); /* what does this do? */
 115    brw_set_saturate(p, 0);
 116    brw_set_compression_control(p, BRW_COMPRESSION_NONE);
 117    brw_set_predicate_control_flag_value(p, 0xff);
 118 }
 119
 120
 121 enum pipe_error brw_get_program( struct brw_compile *p,
 122                                  const GLuint **data,
 123                                  GLuint *sz )
 124 {
 125    GLuint i;
 126
 127    for (i = 0; i < 8; i++)
 128       brw_NOP(p);
 129
 130    /* Is the generated program malformed for some reason?
 131     */
 132    if (p->error)
 133       return PIPE_ERROR_BAD_INPUT;
 134
 135    *sz = p->nr_insn * sizeof(struct brw_instruction);
 136    *data = (const GLuint *)p->store;
 137    return PIPE_OK;
 138 }
 139
 140
 141
 142 /**
 143  * Subroutine calls require special attention.
 144  * Mesa instructions may be expanded into multiple hardware instructions
 145  * so the prog_instruction::BranchTarget field can't be used as an index
 146  * into the hardware instructions.
 147  *
 148  * The BranchTarget field isn't needed, however.  Mesa's GLSL compiler
 149  * emits CAL and BGNSUB instructions with labels that can be used to map
 150  * subroutine calls to actual subroutine code blocks.
 151  *
 152  * The structures and function here implement patching of CAL instructions
 153  * so they jump to the right subroutine code...
 154  */
 155
 156
 157 /**
 158  * For each OPCODE_BGNSUB we create one of these.
 159  */
 160 struct brw_eu_label
 161 {
 162    GLuint label;     /**< the label number */
 163    GLuint position;  /**< the position of the brw instruction for this label */
 164    struct brw_eu_label *next;  /**< next in linked list */
 165 };
 166
 167
 168 /**
 169  * For each OPCODE_CAL we create one of these.
 170  */
 171 struct brw_eu_call
 172 {
 173    GLuint call_inst_pos;  /**< location of the CAL instruction */
 174    GLuint label;
 175    struct brw_eu_call *next;  /**< next in linked list */
 176 };
 177
 178
 179 /**
 180  * Called for each OPCODE_BGNSUB.
 181  */
 182 void
 183 brw_save_label(struct brw_compile *c, unsigned l, GLuint position)
 184 {
 185    struct brw_eu_label *label = CALLOC_STRUCT(brw_eu_label);
 186    label->label = l;
 187    label->position = position;
 188    label->next = c->first_label;
 189    c->first_label = label;
 190 }
 191
 192
 193 /**
 194  * Called for each OPCODE_CAL.
 195  */
 196 void
 197 brw_save_call(struct brw_compile *c, GLuint label, GLuint call_pos)
 198 {
 199    struct brw_eu_call *call = CALLOC_STRUCT(brw_eu_call);
 200    call->call_inst_pos = call_pos;
 201    call->label = label;
 202    call->next = c->first_call;
 203    c->first_call = call;
 204 }
 205
 206
 207 /**
 208  * Lookup a label, return label's position/offset.
 209  */
 210 static GLuint
 211 brw_lookup_label(struct brw_compile *c, unsigned l)
 212 {
 213    const struct brw_eu_label *label;
 214    for (label = c->first_label; label; label = label->next) {
 215       if (l == label->label) {
 216          return label->position;
 217       }
 218    }
 219    abort();  /* should never happen */
 220    return ~0;
 221 }
 222
 223
 224 /**
 225  * When we're done generating code, this function is called to resolve
 226  * subroutine calls.
 227  */
 228 void
 229 brw_resolve_cals(struct brw_compile *c)
 230 {
 231     const struct brw_eu_call *call;
 232
 233     for (call = c->first_call; call; call = call->next) {
 234         const GLuint sub_loc = brw_lookup_label(c, call->label);
 235         struct brw_instruction *brw_call_inst = &c->store[call->call_inst_pos];
 236         struct brw_instruction *brw_sub_inst = &c->store[sub_loc];
 237         GLint offset = brw_sub_inst - brw_call_inst;
 238
 239         /* patch brw_inst1 to point to brw_inst2 */
 240         brw_set_src1(brw_call_inst, brw_imm_d(offset * 16));
 241     }
 242
 243     /* free linked list of calls */
 244     {
 245         struct brw_eu_call *call, *next;
 246         for (call = c->first_call; call; call = next) {
 247             next = call->next;
 248             FREE(call);
 249         }
 250         c->first_call = NULL;
 251     }
 252
 253     /* free linked list of labels */
 254     {
 255         struct brw_eu_label *label, *next;
 256         for (label = c->first_label; label; label = next) {
 257             next = label->next;
 258             FREE(label);
 259         }
 260         c->first_label = NULL;
 261     }
 262 }