src/mesa/drivers/dri/r300/compiler/radeon_dataflow_swizzles.c

   1 /*
   2  * Copyright (C) 2009 Nicolai Haehnle.
   3  *
   4  * All Rights Reserved.
   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 #include "radeon_dataflow.h"
  29
  30 #include "radeon_compiler.h"
  31 #include "radeon_swizzle.h"
  32
  33
  34 static void rewrite_source(struct radeon_compiler * c,
  35                 struct rc_instruction * inst, unsigned src)
  36 {
  37         struct rc_swizzle_split split;
  38         unsigned int tempreg = rc_find_free_temporary(c);
  39         unsigned int usemask;
  40
  41         usemask = 0;
  42         for(unsigned int chan = 0; chan < 4; ++chan) {
  43                 if (GET_SWZ(inst->I.SrcReg[src].Swizzle, chan) != RC_SWIZZLE_UNUSED)
  44                         usemask |= 1 << chan;
  45         }
  46
  47         c->SwizzleCaps->Split(inst->I.SrcReg[src], usemask, &split);
  48
  49         for(unsigned int phase = 0; phase < split.NumPhases; ++phase) {
  50                 struct rc_instruction * mov = rc_insert_new_instruction(c, inst->Prev);
  51                 unsigned int phase_refmask;
  52                 unsigned int masked_negate;
  53
  54                 mov->I.Opcode = RC_OPCODE_MOV;
  55                 mov->I.DstReg.File = RC_FILE_TEMPORARY;
  56                 mov->I.DstReg.Index = tempreg;
  57                 mov->I.DstReg.WriteMask = split.Phase[phase];
  58                 mov->I.SrcReg[0] = inst->I.SrcReg[src];
  59
  60                 phase_refmask = 0;
  61                 for(unsigned int chan = 0; chan < 4; ++chan) {
  62                         if (!GET_BIT(split.Phase[phase], chan))
  63                                 SET_SWZ(mov->I.SrcReg[0].Swizzle, chan, RC_SWIZZLE_UNUSED);
  64                         else
  65                                 phase_refmask |= 1 << GET_SWZ(mov->I.SrcReg[0].Swizzle, chan);
  66                 }
  67
  68                 phase_refmask &= RC_MASK_XYZW;
  69
  70                 masked_negate = split.Phase[phase] & mov->I.SrcReg[0].Negate;
  71                 if (masked_negate == 0)
  72                         mov->I.SrcReg[0].Negate = 0;
  73                 else if (masked_negate == split.Phase[phase])
  74                         mov->I.SrcReg[0].Negate = RC_MASK_XYZW;
  75
  76         }
  77
  78         inst->I.SrcReg[src].File = RC_FILE_TEMPORARY;
  79         inst->I.SrcReg[src].Index = tempreg;
  80         inst->I.SrcReg[src].Swizzle = 0;
  81         inst->I.SrcReg[src].Negate = RC_MASK_NONE;
  82         inst->I.SrcReg[src].Abs = 0;
  83         for(unsigned int chan = 0; chan < 4; ++chan) {
  84                 SET_SWZ(inst->I.SrcReg[src].Swizzle, chan,
  85                                 GET_BIT(usemask, chan) ? chan : RC_SWIZZLE_UNUSED);
  86         }
  87 }
  88
  89 void rc_dataflow_swizzles(struct radeon_compiler * c)
  90 {
  91         struct rc_instruction * inst;
  92
  93         for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
  94                 const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
  95                 unsigned int src;
  96
  97                 for(src = 0; src < opcode->NumSrcRegs; ++src) {
  98                         if (!c->SwizzleCaps->IsNative(inst->I.Opcode, inst->I.SrcReg[src]))
  99                                 rewrite_source(c, inst, src);
 100                 }
 101         }
 102 }