src/mesa/drivers/dri/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
  33 #include "brw_context.h"
  34 #include "brw_defines.h"
  35 #include "brw_eu.h"
  36
  37
  38
  39 /* How does predicate control work when execution_size != 8?  Do I
  40  * need to test/set for 0xffff when execution_size is 16?
  41  */
  42 void brw_set_predicate_control_flag_value( struct brw_compile *p, GLuint value )
  43 {
  44    p->current->header.predicate_control = BRW_PREDICATE_NONE;
  45
  46    if (value != 0xff) {
  47       if (value != p->flag_value) {
  48          brw_push_insn_state(p);
  49          brw_MOV(p, brw_flag_reg(), brw_imm_uw(value));
  50          p->flag_value = value;
  51          brw_pop_insn_state(p);
  52       }
  53
  54       p->current->header.predicate_control = BRW_PREDICATE_NORMAL;
  55    }
  56 }
  57
  58 void brw_set_predicate_control( struct brw_compile *p, GLuint pc )
  59 {
  60    p->current->header.predicate_control = pc;
  61 }
  62
  63 void brw_set_conditionalmod( struct brw_compile *p, GLuint conditional )
  64 {
  65    p->current->header.destreg__conditionalmod = conditional;
  66 }
  67
  68 void brw_set_access_mode( struct brw_compile *p, GLuint access_mode )
  69 {
  70    p->current->header.access_mode = access_mode;
  71 }
  72
  73 void brw_set_compression_control( struct brw_compile *p, GLboolean compression_control )
  74 {
  75    p->current->header.compression_control = compression_control;
  76 }
  77
  78 void brw_set_mask_control( struct brw_compile *p, GLuint value )
  79 {
  80    p->current->header.mask_control = value;
  81 }
  82
  83 void brw_set_saturate( struct brw_compile *p, GLuint value )
  84 {
  85    p->current->header.saturate = value;
  86 }
  87
  88 void brw_set_acc_write_control(struct brw_compile *p, GLuint value)
  89 {
  90    if (p->brw->intel.gen >= 6)
  91       p->current->header.acc_wr_control = value;
  92 }
  93
  94 void brw_push_insn_state( struct brw_compile *p )
  95 {
  96    assert(p->current != &p->stack[BRW_EU_MAX_INSN_STACK-1]);
  97    memcpy(p->current+1, p->current, sizeof(struct brw_instruction));
  98    p->current++;
  99 }
 100
 101 void brw_pop_insn_state( struct brw_compile *p )
 102 {
 103    assert(p->current != p->stack);
 104    p->current--;
 105 }
 106
 107
 108 /***********************************************************************
 109  */
 110 void brw_init_compile( struct brw_context *brw, struct brw_compile *p )
 111 {
 112    p->brw = brw;
 113    p->nr_insn = 0;
 114    p->current = p->stack;
 115    memset(p->current, 0, sizeof(p->current[0]));
 116
 117    /* Some defaults?
 118     */
 119    brw_set_mask_control(p, BRW_MASK_ENABLE); /* what does this do? */
 120    brw_set_saturate(p, 0);
 121    brw_set_compression_control(p, BRW_COMPRESSION_NONE);
 122    brw_set_predicate_control_flag_value(p, 0xff);
 123 }
 124
 125
 126 const GLuint *brw_get_program( struct brw_compile *p,
 127                                GLuint *sz )
 128 {
 129    GLuint i;
 130
 131    for (i = 0; i < 8; i++)
 132       brw_NOP(p);
 133
 134    *sz = p->nr_insn * sizeof(struct brw_instruction);
 135    return (const GLuint *)p->store;
 136 }
 137
 138
 139
 140 /**
 141  * Subroutine calls require special attention.
 142  * Mesa instructions may be expanded into multiple hardware instructions
 143  * so the prog_instruction::BranchTarget field can't be used as an index
 144  * into the hardware instructions.
 145  *
 146  * The BranchTarget field isn't needed, however.  Mesa's GLSL compiler
 147  * emits CAL and BGNSUB instructions with labels that can be used to map
 148  * subroutine calls to actual subroutine code blocks.
 149  *
 150  * The structures and function here implement patching of CAL instructions
 151  * so they jump to the right subroutine code...
 152  */
 153
 154
 155 /**
 156  * For each OPCODE_BGNSUB we create one of these.
 157  */
 158 struct brw_glsl_label
 159 {
 160    const char *name; /**< the label string */
 161    GLuint position;  /**< the position of the brw instruction for this label */
 162    struct brw_glsl_label *next;  /**< next in linked list */
 163 };
 164
 165
 166 /**
 167  * For each OPCODE_CAL we create one of these.
 168  */
 169 struct brw_glsl_call
 170 {
 171    GLuint call_inst_pos;  /**< location of the CAL instruction */
 172    const char *sub_name;  /**< name of subroutine to call */
 173    struct brw_glsl_call *next;  /**< next in linked list */
 174 };
 175
 176
 177 /**
 178  * Called for each OPCODE_BGNSUB.
 179  */
 180 void
 181 brw_save_label(struct brw_compile *c, const char *name, GLuint position)
 182 {
 183    struct brw_glsl_label *label = CALLOC_STRUCT(brw_glsl_label);
 184    label->name = name;
 185    label->position = position;
 186    label->next = c->first_label;
 187    c->first_label = label;
 188 }
 189
 190
 191 /**
 192  * Called for each OPCODE_CAL.
 193  */
 194 void
 195 brw_save_call(struct brw_compile *c, const char *name, GLuint call_pos)
 196 {
 197    struct brw_glsl_call *call = CALLOC_STRUCT(brw_glsl_call);
 198    call->call_inst_pos = call_pos;
 199    call->sub_name = name;
 200    call->next = c->first_call;
 201    c->first_call = call;
 202 }
 203
 204
 205 /**
 206  * Lookup a label, return label's position/offset.
 207  */
 208 static GLuint
 209 brw_lookup_label(struct brw_compile *c, const char *name)
 210 {
 211    const struct brw_glsl_label *label;
 212    for (label = c->first_label; label; label = label->next) {
 213       if (strcmp(name, label->name) == 0) {
 214          return label->position;
 215       }
 216    }
 217    abort();  /* should never happen */
 218    return ~0;
 219 }
 220
 221
 222 /**
 223  * When we're done generating code, this function is called to resolve
 224  * subroutine calls.
 225  */
 226 void
 227 brw_resolve_cals(struct brw_compile *c)
 228 {
 229     const struct brw_glsl_call *call;
 230
 231     for (call = c->first_call; call; call = call->next) {
 232         const GLuint sub_loc = brw_lookup_label(c, call->sub_name);
 233         struct brw_instruction *brw_call_inst = &c->store[call->call_inst_pos];
 234         struct brw_instruction *brw_sub_inst = &c->store[sub_loc];
 235         GLint offset = brw_sub_inst - brw_call_inst;
 236
 237         /* patch brw_inst1 to point to brw_inst2 */
 238         brw_set_src1(brw_call_inst, brw_imm_d(offset * 16));
 239     }
 240
 241     /* free linked list of calls */
 242     {
 243         struct brw_glsl_call *call, *next;
 244         for (call = c->first_call; call; call = next) {
 245             next = call->next;
 246             free(call);
 247         }
 248         c->first_call = NULL;
 249     }
 250
 251     /* free linked list of labels */
 252     {
 253         struct brw_glsl_label *label, *next;
 254         for (label = c->first_label; label; label = next) {
 255             next = label->next;
 256             free(label);
 257         }
 258         c->first_label = NULL;
 259     }
 260 }