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_push_insn_state( struct brw_compile *p )
  89 {
  90    assert(p->current != &p->stack[BRW_EU_MAX_INSN_STACK-1]);
  91    memcpy(p->current+1, p->current, sizeof(struct brw_instruction));
  92    p->current++;
  93 }
  94
  95 void brw_pop_insn_state( struct brw_compile *p )
  96 {
  97    assert(p->current != p->stack);
  98    p->current--;
  99 }
 100
 101
 102 /***********************************************************************
 103  */
 104 void brw_init_compile( struct brw_context *brw, struct brw_compile *p )
 105 {
 106    p->brw = brw;
 107    p->nr_insn = 0;
 108    p->current = p->stack;
 109    memset(p->current, 0, sizeof(p->current[0]));
 110
 111    /* Some defaults?
 112     */
 113    brw_set_mask_control(p, BRW_MASK_ENABLE); /* what does this do? */
 114    brw_set_saturate(p, 0);
 115    brw_set_compression_control(p, BRW_COMPRESSION_NONE);
 116    brw_set_predicate_control_flag_value(p, 0xff);
 117 }
 118
 119
 120 const GLuint *brw_get_program( struct brw_compile *p,
 121                                GLuint *sz )
 122 {
 123    GLuint i;
 124
 125    for (i = 0; i < 8; i++)
 126       brw_NOP(p);
 127
 128    *sz = p->nr_insn * sizeof(struct brw_instruction);
 129    return (const GLuint *)p->store;
 130 }
 131
 132
 133
 134 /**
 135  * Subroutine calls require special attention.
 136  * Mesa instructions may be expanded into multiple hardware instructions
 137  * so the prog_instruction::BranchTarget field can't be used as an index
 138  * into the hardware instructions.
 139  *
 140  * The BranchTarget field isn't needed, however.  Mesa's GLSL compiler
 141  * emits CAL and BGNSUB instructions with labels that can be used to map
 142  * subroutine calls to actual subroutine code blocks.
 143  *
 144  * The structures and function here implement patching of CAL instructions
 145  * so they jump to the right subroutine code...
 146  */
 147
 148
 149 /**
 150  * For each OPCODE_BGNSUB we create one of these.
 151  */
 152 struct brw_glsl_label
 153 {
 154    const char *name; /**< the label string */
 155    GLuint position;  /**< the position of the brw instruction for this label */
 156    struct brw_glsl_label *next;  /**< next in linked list */
 157 };
 158
 159
 160 /**
 161  * For each OPCODE_CAL we create one of these.
 162  */
 163 struct brw_glsl_call
 164 {
 165    GLuint call_inst_pos;  /**< location of the CAL instruction */
 166    const char *sub_name;  /**< name of subroutine to call */
 167    struct brw_glsl_call *next;  /**< next in linked list */
 168 };
 169
 170
 171 /**
 172  * Called for each OPCODE_BGNSUB.
 173  */
 174 void
 175 brw_save_label(struct brw_compile *c, const char *name, GLuint position)
 176 {
 177    struct brw_glsl_label *label = CALLOC_STRUCT(brw_glsl_label);
 178    label->name = name;
 179    label->position = position;
 180    label->next = c->first_label;
 181    c->first_label = label;
 182 }
 183
 184
 185 /**
 186  * Called for each OPCODE_CAL.
 187  */
 188 void
 189 brw_save_call(struct brw_compile *c, const char *name, GLuint call_pos)
 190 {
 191    struct brw_glsl_call *call = CALLOC_STRUCT(brw_glsl_call);
 192    call->call_inst_pos = call_pos;
 193    call->sub_name = name;
 194    call->next = c->first_call;
 195    c->first_call = call;
 196 }
 197
 198
 199 /**
 200  * Lookup a label, return label's position/offset.
 201  */
 202 static GLuint
 203 brw_lookup_label(struct brw_compile *c, const char *name)
 204 {
 205    const struct brw_glsl_label *label;
 206    for (label = c->first_label; label; label = label->next) {
 207       if (strcmp(name, label->name) == 0) {
 208          return label->position;
 209       }
 210    }
 211    abort();  /* should never happen */
 212    return ~0;
 213 }
 214
 215
 216 /**
 217  * When we're done generating code, this function is called to resolve
 218  * subroutine calls.
 219  */
 220 void
 221 brw_resolve_cals(struct brw_compile *c)
 222 {
 223     const struct brw_glsl_call *call;
 224
 225     for (call = c->first_call; call; call = call->next) {
 226         const GLuint sub_loc = brw_lookup_label(c, call->sub_name);
 227         struct brw_instruction *brw_call_inst = &c->store[call->call_inst_pos];
 228         struct brw_instruction *brw_sub_inst = &c->store[sub_loc];
 229         GLint offset = brw_sub_inst - brw_call_inst;
 230
 231         /* patch brw_inst1 to point to brw_inst2 */
 232         brw_set_src1(brw_call_inst, brw_imm_d(offset * 16));
 233     }
 234
 235     /* free linked list of calls */
 236     {
 237         struct brw_glsl_call *call, *next;
 238         for (call = c->first_call; call; call = next) {
 239             next = call->next;
 240             free(call);
 241         }
 242         c->first_call = NULL;
 243     }
 244
 245     /* free linked list of labels */
 246     {
 247         struct brw_glsl_label *label, *next;
 248         for (label = c->first_label; label; label = next) {
 249             next = label->next;
 250             free(label);
 251         }
 252         c->first_label = NULL;
 253     }
 254 }