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Regard whitespace Rev 4357 → Rev 4358

/contrib/sdk/sources/Mesa/src/gallium/drivers/freedreno/a3xx/fd3_compiler.c
0,0 → 1,1268
/* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
 
/*
* Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors:
* Rob Clark <robclark@freedesktop.org>
*/
 
#include <stdarg.h>
 
#include "pipe/p_state.h"
#include "util/u_string.h"
#include "util/u_memory.h"
#include "util/u_inlines.h"
#include "tgsi/tgsi_parse.h"
#include "tgsi/tgsi_ureg.h"
#include "tgsi/tgsi_info.h"
#include "tgsi/tgsi_strings.h"
#include "tgsi/tgsi_dump.h"
#include "tgsi/tgsi_scan.h"
 
#include "fd3_compiler.h"
#include "fd3_program.h"
#include "fd3_util.h"
 
#include "instr-a3xx.h"
#include "ir-a3xx.h"
 
/* ************************************************************************* */
/* split the out or find some helper to use.. like main/bitset.h.. */
 
#define MAX_REG 256
 
typedef uint8_t regmask_t[2 * MAX_REG / 8];
 
static unsigned regmask_idx(struct ir3_register *reg)
{
unsigned num = reg->num;
assert(num < MAX_REG);
if (reg->flags & IR3_REG_HALF)
num += MAX_REG;
return num;
}
 
static void regmask_set(regmask_t regmask, struct ir3_register *reg)
{
unsigned idx = regmask_idx(reg);
regmask[idx / 8] |= 1 << (idx % 8);
}
 
static unsigned regmask_get(regmask_t regmask, struct ir3_register *reg)
{
unsigned idx = regmask_idx(reg);
return regmask[idx / 8] & (1 << (idx % 8));
}
 
/* ************************************************************************* */
 
struct fd3_compile_context {
const struct tgsi_token *tokens;
struct ir3_shader *ir;
struct fd3_shader_stateobj *so;
 
struct tgsi_parse_context parser;
unsigned type;
 
struct tgsi_shader_info info;
 
/* last input dst (for setting (ei) flag): */
struct ir3_register *last_input;
 
unsigned next_inloc;
unsigned num_internal_temps;
 
/* track registers which need to synchronize w/ "complex alu" cat3
* instruction pipeline:
*/
regmask_t needs_ss;
 
/* track registers which need to synchronize with texture fetch
* pipeline:
*/
regmask_t needs_sy;
 
/* inputs start at r0, temporaries start after last input, and
* outputs start after last temporary.
*
* We could be more clever, because this is not a hw restriction,
* but probably best just to implement an optimizing pass to
* reduce the # of registers used and get rid of redundant mov's
* (to output register).
*/
unsigned base_reg[TGSI_FILE_COUNT];
 
/* idx/slot for last compiler generated immediate */
unsigned immediate_idx;
 
/* stack of branch instructions that start (potentially nested)
* branch instructions, so that we can fix up the branch targets
* so that we can fix up the branch target on the corresponding
* END instruction
*/
struct ir3_instruction *branch[16];
unsigned int branch_count;
 
/* used when dst is same as one of the src, to avoid overwriting a
* src element before the remaining scalar instructions that make
* up the vector operation
*/
struct tgsi_dst_register tmp_dst;
struct tgsi_src_register tmp_src;
};
 
static unsigned
compile_init(struct fd3_compile_context *ctx, struct fd3_shader_stateobj *so,
const struct tgsi_token *tokens)
{
unsigned ret;
 
ctx->tokens = tokens;
ctx->ir = so->ir;
ctx->so = so;
ctx->last_input = NULL;
ctx->next_inloc = 8;
ctx->num_internal_temps = 0;
ctx->branch_count = 0;
 
memset(ctx->needs_ss, 0, sizeof(ctx->needs_ss));
memset(ctx->needs_sy, 0, sizeof(ctx->needs_sy));
memset(ctx->base_reg, 0, sizeof(ctx->base_reg));
 
tgsi_scan_shader(tokens, &ctx->info);
 
/* Immediates go after constants: */
ctx->base_reg[TGSI_FILE_CONSTANT] = 0;
ctx->base_reg[TGSI_FILE_IMMEDIATE] =
ctx->info.file_count[TGSI_FILE_CONSTANT];
 
/* Temporaries after outputs after inputs: */
ctx->base_reg[TGSI_FILE_INPUT] = 0;
ctx->base_reg[TGSI_FILE_OUTPUT] =
ctx->info.file_count[TGSI_FILE_INPUT];
ctx->base_reg[TGSI_FILE_TEMPORARY] =
ctx->info.file_count[TGSI_FILE_INPUT] +
ctx->info.file_count[TGSI_FILE_OUTPUT];
 
so->first_immediate = ctx->base_reg[TGSI_FILE_IMMEDIATE];
ctx->immediate_idx = 4 * (ctx->info.file_count[TGSI_FILE_CONSTANT] +
ctx->info.file_count[TGSI_FILE_IMMEDIATE]);
 
ret = tgsi_parse_init(&ctx->parser, tokens);
if (ret != TGSI_PARSE_OK)
return ret;
 
ctx->type = ctx->parser.FullHeader.Processor.Processor;
 
return ret;
}
 
static void
compile_free(struct fd3_compile_context *ctx)
{
tgsi_parse_free(&ctx->parser);
}
 
struct instr_translater {
void (*fxn)(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst);
unsigned tgsi_opc;
opc_t opc;
opc_t hopc; /* opc to use for half_precision mode, if different */
unsigned arg;
};
 
static struct ir3_register *
add_dst_reg(struct fd3_compile_context *ctx, struct ir3_instruction *instr,
const struct tgsi_dst_register *dst, unsigned chan)
{
unsigned flags = 0, num = 0;
 
switch (dst->File) {
case TGSI_FILE_OUTPUT:
case TGSI_FILE_TEMPORARY:
num = dst->Index + ctx->base_reg[dst->File];
break;
default:
DBG("unsupported dst register file: %s",
tgsi_file_name(dst->File));
assert(0);
break;
}
 
if (ctx->so->half_precision)
flags |= IR3_REG_HALF;
 
return ir3_reg_create(instr, regid(num, chan), flags);
}
 
static struct ir3_register *
add_src_reg(struct fd3_compile_context *ctx, struct ir3_instruction *instr,
const struct tgsi_src_register *src, unsigned chan)
{
unsigned flags = 0, num = 0;
struct ir3_register *reg;
 
switch (src->File) {
case TGSI_FILE_IMMEDIATE:
/* TODO if possible, use actual immediate instead of const.. but
* TGSI has vec4 immediates, we can only embed scalar (of limited
* size, depending on instruction..)
*/
case TGSI_FILE_CONSTANT:
flags |= IR3_REG_CONST;
num = src->Index + ctx->base_reg[src->File];
break;
case TGSI_FILE_INPUT:
case TGSI_FILE_TEMPORARY:
num = src->Index + ctx->base_reg[src->File];
break;
default:
DBG("unsupported src register file: %s",
tgsi_file_name(src->File));
assert(0);
break;
}
 
if (src->Absolute)
flags |= IR3_REG_ABS;
if (src->Negate)
flags |= IR3_REG_NEGATE;
if (ctx->so->half_precision)
flags |= IR3_REG_HALF;
 
reg = ir3_reg_create(instr, regid(num, chan), flags);
 
if (regmask_get(ctx->needs_ss, reg)) {
instr->flags |= IR3_INSTR_SS;
memset(ctx->needs_ss, 0, sizeof(ctx->needs_ss));
}
 
if (regmask_get(ctx->needs_sy, reg)) {
instr->flags |= IR3_INSTR_SY;
memset(ctx->needs_sy, 0, sizeof(ctx->needs_sy));
}
 
return reg;
}
 
static void
src_from_dst(struct tgsi_src_register *src, struct tgsi_dst_register *dst)
{
src->File = dst->File;
src->Indirect = dst->Indirect;
src->Dimension = dst->Dimension;
src->Index = dst->Index;
src->Absolute = 0;
src->Negate = 0;
src->SwizzleX = TGSI_SWIZZLE_X;
src->SwizzleY = TGSI_SWIZZLE_Y;
src->SwizzleZ = TGSI_SWIZZLE_Z;
src->SwizzleW = TGSI_SWIZZLE_W;
}
 
/* Get internal-temp src/dst to use for a sequence of instructions
* generated by a single TGSI op.
*/
static void
get_internal_temp(struct fd3_compile_context *ctx,
struct tgsi_dst_register *tmp_dst,
struct tgsi_src_register *tmp_src)
{
int n;
 
tmp_dst->File = TGSI_FILE_TEMPORARY;
tmp_dst->WriteMask = TGSI_WRITEMASK_XYZW;
tmp_dst->Indirect = 0;
tmp_dst->Dimension = 0;
 
/* assign next temporary: */
n = ctx->num_internal_temps++;
 
tmp_dst->Index = ctx->info.file_count[TGSI_FILE_TEMPORARY] + n;
 
src_from_dst(tmp_src, tmp_dst);
}
 
/* same as get_internal_temp, but w/ src.xxxx (for instructions that
* replicate their results)
*/
static void
get_internal_temp_repl(struct fd3_compile_context *ctx,
struct tgsi_dst_register *tmp_dst,
struct tgsi_src_register *tmp_src)
{
get_internal_temp(ctx, tmp_dst, tmp_src);
tmp_src->SwizzleX = tmp_src->SwizzleY =
tmp_src->SwizzleZ = tmp_src->SwizzleW = TGSI_SWIZZLE_X;
}
 
static void
get_immediate(struct fd3_compile_context *ctx,
struct tgsi_src_register *reg, uint32_t val)
{
unsigned neg, swiz, idx, i;
/* actually maps 1:1 currently.. not sure if that is safe to rely on: */
static const unsigned swiz2tgsi[] = {
TGSI_SWIZZLE_X, TGSI_SWIZZLE_Y, TGSI_SWIZZLE_Z, TGSI_SWIZZLE_W,
};
 
for (i = 0; i < ctx->immediate_idx; i++) {
swiz = i % 4;
idx = i / 4;
 
if (ctx->so->immediates[idx].val[swiz] == val) {
neg = 0;
break;
}
 
if (ctx->so->immediates[idx].val[swiz] == -val) {
neg = 1;
break;
}
}
 
if (i == ctx->immediate_idx) {
/* need to generate a new immediate: */
swiz = i % 4;
idx = i / 4;
neg = 0;
ctx->so->immediates[idx].val[swiz] = val;
ctx->so->immediates_count = idx + 1;
ctx->immediate_idx++;
}
 
reg->File = TGSI_FILE_IMMEDIATE;
reg->Indirect = 0;
reg->Dimension = 0;
reg->Index = idx;
reg->Absolute = 0;
reg->Negate = neg;
reg->SwizzleX = swiz2tgsi[swiz];
reg->SwizzleY = swiz2tgsi[swiz];
reg->SwizzleZ = swiz2tgsi[swiz];
reg->SwizzleW = swiz2tgsi[swiz];
}
 
static type_t
get_type(struct fd3_compile_context *ctx)
{
return ctx->so->half_precision ? TYPE_F16 : TYPE_F32;
}
 
static unsigned
src_swiz(struct tgsi_src_register *src, int chan)
{
switch (chan) {
case 0: return src->SwizzleX;
case 1: return src->SwizzleY;
case 2: return src->SwizzleZ;
case 3: return src->SwizzleW;
}
assert(0);
return 0;
}
 
static void
create_mov(struct fd3_compile_context *ctx, struct tgsi_dst_register *dst,
struct tgsi_src_register *src)
{
type_t type_mov = get_type(ctx);
unsigned i;
 
for (i = 0; i < 4; i++) {
/* move to destination: */
if (dst->WriteMask & (1 << i)) {
struct ir3_instruction *instr =
ir3_instr_create(ctx->ir, 1, 0);
instr->cat1.src_type = type_mov;
instr->cat1.dst_type = type_mov;
add_dst_reg(ctx, instr, dst, i);
add_src_reg(ctx, instr, src, src_swiz(src, i));
} else {
ir3_instr_create(ctx->ir, 0, OPC_NOP);
}
}
 
}
 
static struct tgsi_dst_register *
get_dst(struct fd3_compile_context *ctx, struct tgsi_full_instruction *inst)
{
struct tgsi_dst_register *dst = &inst->Dst[0].Register;
unsigned i;
for (i = 0; i < inst->Instruction.NumSrcRegs; i++) {
struct tgsi_src_register *src = &inst->Src[i].Register;
if ((src->File == dst->File) && (src->Index == dst->Index)) {
get_internal_temp(ctx, &ctx->tmp_dst, &ctx->tmp_src);
ctx->tmp_dst.WriteMask = dst->WriteMask;
dst = &ctx->tmp_dst;
break;
}
}
return dst;
}
 
static void
put_dst(struct fd3_compile_context *ctx, struct tgsi_full_instruction *inst,
struct tgsi_dst_register *dst)
{
/* if necessary, add mov back into original dst: */
if (dst != &inst->Dst[0].Register) {
create_mov(ctx, &inst->Dst[0].Register, &ctx->tmp_src);
}
}
 
/* helper to generate the necessary repeat and/or additional instructions
* to turn a scalar instruction into a vector operation:
*/
static void
vectorize(struct fd3_compile_context *ctx, struct ir3_instruction *instr,
struct tgsi_dst_register *dst, int nsrcs, ...)
{
va_list ap;
int i, j, n = 0;
 
add_dst_reg(ctx, instr, dst, 0);
 
va_start(ap, nsrcs);
for (j = 0; j < nsrcs; j++) {
struct tgsi_src_register *src =
va_arg(ap, struct tgsi_src_register *);
unsigned flags = va_arg(ap, unsigned);
add_src_reg(ctx, instr, src, 0)->flags |= flags;
}
va_end(ap);
 
for (i = 0; i < 4; i++) {
if (dst->WriteMask & (1 << i)) {
struct ir3_instruction *cur;
 
if (n++ == 0) {
cur = instr;
} else {
cur = ir3_instr_clone(instr);
cur->flags &= ~(IR3_INSTR_SY | IR3_INSTR_SS | IR3_INSTR_JP);
}
 
/* fix-up dst register component: */
cur->regs[0]->num = regid(cur->regs[0]->num >> 2, i);
 
/* fix-up src register component: */
va_start(ap, nsrcs);
for (j = 0; j < nsrcs; j++) {
struct tgsi_src_register *src =
va_arg(ap, struct tgsi_src_register *);
(void)va_arg(ap, unsigned);
cur->regs[j+1]->num =
regid(cur->regs[j+1]->num >> 2,
src_swiz(src, i));
}
va_end(ap);
}
}
 
/* pad w/ nop's.. at least until we are clever enough to
* figure out if we really need to..
*/
for (; n < 4; n++) {
ir3_instr_create(instr->shader, 0, OPC_NOP);
}
}
 
/*
* Handlers for TGSI instructions which do not have a 1:1 mapping to
* native instructions:
*/
 
static void
trans_dotp(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct ir3_instruction *instr;
struct tgsi_dst_register tmp_dst;
struct tgsi_src_register tmp_src;
struct tgsi_dst_register *dst = &inst->Dst[0].Register;
struct tgsi_src_register *src0 = &inst->Src[0].Register;
struct tgsi_src_register *src1 = &inst->Src[1].Register;
unsigned swiz0[] = { src0->SwizzleX, src0->SwizzleY, src0->SwizzleZ, src0->SwizzleW };
unsigned swiz1[] = { src1->SwizzleX, src1->SwizzleY, src1->SwizzleZ, src1->SwizzleW };
opc_t opc_mad = ctx->so->half_precision ? OPC_MAD_F16 : OPC_MAD_F32;
unsigned n = t->arg; /* number of components */
unsigned i;
 
get_internal_temp_repl(ctx, &tmp_dst, &tmp_src);
 
/* Blob compiler never seems to use a const in src1 position for
* mad.*, although there does seem (according to disassembler
* hidden in libllvm-a3xx.so) to be a bit to indicate that src1
* is a const. Not sure if this is a hw bug, or simply that the
* disassembler lies.
*/
if ((src1->File == TGSI_FILE_IMMEDIATE) ||
(src1->File == TGSI_FILE_CONSTANT)) {
 
/* the mov to tmp unswizzles src1, so now we have tmp.xyzw:
*/
for (i = 0; i < 4; i++)
swiz1[i] = i;
 
/* the first mul.f will clobber tmp.x, but that is ok
* because after that point we no longer need tmp.x:
*/
create_mov(ctx, &tmp_dst, src1);
src1 = &tmp_src;
}
 
instr = ir3_instr_create(ctx->ir, 2, OPC_MUL_F);
add_dst_reg(ctx, instr, &tmp_dst, 0);
add_src_reg(ctx, instr, src0, swiz0[0]);
add_src_reg(ctx, instr, src1, swiz1[0]);
 
for (i = 1; i < n; i++) {
ir3_instr_create(ctx->ir, 0, OPC_NOP);
 
instr = ir3_instr_create(ctx->ir, 3, opc_mad);
add_dst_reg(ctx, instr, &tmp_dst, 0);
add_src_reg(ctx, instr, src0, swiz0[i]);
add_src_reg(ctx, instr, src1, swiz1[i]);
add_src_reg(ctx, instr, &tmp_src, 0);
}
 
/* DPH(a,b) = (a.x * b.x) + (a.y * b.y) + (a.z * b.z) + b.w */
if (t->tgsi_opc == TGSI_OPCODE_DPH) {
ir3_instr_create(ctx->ir, 0, OPC_NOP);
 
instr = ir3_instr_create(ctx->ir, 2, OPC_ADD_F);
add_dst_reg(ctx, instr, &tmp_dst, 0);
add_src_reg(ctx, instr, src1, swiz1[i]);
add_src_reg(ctx, instr, &tmp_src, 0);
 
n++;
}
 
ir3_instr_create(ctx->ir, 0, OPC_NOP);
 
/* pad out to multiple of 4 scalar instructions: */
for (i = 2 * n; i % 4; i++) {
ir3_instr_create(ctx->ir, 0, OPC_NOP);
}
 
create_mov(ctx, dst, &tmp_src);
}
 
/* LRP(a,b,c) = (a * b) + ((1 - a) * c) */
static void
trans_lrp(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct ir3_instruction *instr;
struct tgsi_dst_register tmp_dst1, tmp_dst2;
struct tgsi_src_register tmp_src1, tmp_src2;
struct tgsi_src_register tmp_const;
 
get_internal_temp(ctx, &tmp_dst1, &tmp_src1);
get_internal_temp(ctx, &tmp_dst2, &tmp_src2);
 
get_immediate(ctx, &tmp_const, fui(1.0));
 
/* tmp1 = (a * b) */
instr = ir3_instr_create(ctx->ir, 2, OPC_MUL_F);
vectorize(ctx, instr, &tmp_dst1, 2,
&inst->Src[0].Register, 0,
&inst->Src[1].Register, 0);
 
/* tmp2 = (1 - a) */
instr = ir3_instr_create(ctx->ir, 2, OPC_ADD_F);
vectorize(ctx, instr, &tmp_dst2, 2,
&tmp_const, 0,
&inst->Src[0].Register, IR3_REG_NEGATE);
 
/* tmp2 = tmp2 * c */
instr = ir3_instr_create(ctx->ir, 2, OPC_MUL_F);
vectorize(ctx, instr, &tmp_dst2, 2,
&tmp_src2, 0,
&inst->Src[2].Register, 0);
 
/* dst = tmp1 + tmp2 */
instr = ir3_instr_create(ctx->ir, 2, OPC_ADD_F);
vectorize(ctx, instr, &inst->Dst[0].Register, 2,
&tmp_src1, 0,
&tmp_src2, 0);
}
 
/* FRC(x) = x - FLOOR(x) */
static void
trans_frac(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct ir3_instruction *instr;
struct tgsi_dst_register tmp_dst;
struct tgsi_src_register tmp_src;
 
get_internal_temp(ctx, &tmp_dst, &tmp_src);
 
/* tmp = FLOOR(x) */
instr = ir3_instr_create(ctx->ir, 2, OPC_FLOOR_F);
vectorize(ctx, instr, &tmp_dst, 1,
&inst->Src[0].Register, 0);
 
/* dst = x - tmp */
instr = ir3_instr_create(ctx->ir, 2, OPC_ADD_F);
vectorize(ctx, instr, &inst->Dst[0].Register, 2,
&inst->Src[0].Register, 0,
&tmp_src, IR3_REG_NEGATE);
}
 
/* POW(a,b) = EXP2(b * LOG2(a)) */
static void
trans_pow(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct ir3_instruction *instr;
struct ir3_register *r;
struct tgsi_dst_register tmp_dst;
struct tgsi_src_register tmp_src;
struct tgsi_dst_register *dst = &inst->Dst[0].Register;
struct tgsi_src_register *src0 = &inst->Src[0].Register;
struct tgsi_src_register *src1 = &inst->Src[1].Register;
 
get_internal_temp_repl(ctx, &tmp_dst, &tmp_src);
 
/* log2 Rtmp, Rsrc0 */
ir3_instr_create(ctx->ir, 0, OPC_NOP)->repeat = 5;
instr = ir3_instr_create(ctx->ir, 4, OPC_LOG2);
r = add_dst_reg(ctx, instr, &tmp_dst, 0);
add_src_reg(ctx, instr, src0, src0->SwizzleX);
regmask_set(ctx->needs_ss, r);
 
/* mul.f Rtmp, Rtmp, Rsrc1 */
instr = ir3_instr_create(ctx->ir, 2, OPC_MUL_F);
add_dst_reg(ctx, instr, &tmp_dst, 0);
add_src_reg(ctx, instr, &tmp_src, 0);
add_src_reg(ctx, instr, src1, src1->SwizzleX);
 
/* blob compiler seems to ensure there are at least 6 instructions
* between a "simple" (non-cat4) instruction and a dependent cat4..
* probably we need to handle this in some other places too.
*/
ir3_instr_create(ctx->ir, 0, OPC_NOP)->repeat = 5;
 
/* exp2 Rdst, Rtmp */
instr = ir3_instr_create(ctx->ir, 4, OPC_EXP2);
r = add_dst_reg(ctx, instr, &tmp_dst, 0);
add_src_reg(ctx, instr, &tmp_src, 0);
regmask_set(ctx->needs_ss, r);
 
create_mov(ctx, dst, &tmp_src);
}
 
/* texture fetch/sample instructions: */
static void
trans_samp(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct ir3_register *r;
struct ir3_instruction *instr;
struct tgsi_dst_register tmp_dst;
struct tgsi_src_register tmp_src;
struct tgsi_src_register *coord = &inst->Src[0].Register;
struct tgsi_src_register *samp = &inst->Src[1].Register;
unsigned tex = inst->Texture.Texture;
int8_t *order;
unsigned i, j, flags = 0;
 
switch (t->arg) {
case TGSI_OPCODE_TEX:
order = (tex == TGSI_TEXTURE_2D) ?
(int8_t[4]){ 0, 1, -1, -1 } : /* 2D */
(int8_t[4]){ 0, 1, 2, -1 }; /* 3D */
break;
case TGSI_OPCODE_TXP:
order = (tex == TGSI_TEXTURE_2D) ?
(int8_t[4]){ 0, 1, 3, -1 } : /* 2D */
(int8_t[4]){ 0, 1, 2, 3 }; /* 3D */
flags |= IR3_INSTR_P;
break;
default:
assert(0);
break;
}
 
if (tex == TGSI_TEXTURE_3D)
flags |= IR3_INSTR_3D;
 
/* The texture sample instructions need to coord in successive
* registers/components (ie. src.xy but not src.yx). And TXP
* needs the .w component in .z for 2D.. so in some cases we
* might need to emit some mov instructions to shuffle things
* around:
*/
for (i = 1; (i < 4) && (order[i] >= 0); i++) {
if (src_swiz(coord, i) != (src_swiz(coord, 0) + order[i])) {
type_t type_mov = get_type(ctx);
 
/* need to move things around: */
get_internal_temp(ctx, &tmp_dst, &tmp_src);
 
for (j = 0; (j < 4) && (order[j] >= 0); j++) {
instr = ir3_instr_create(ctx->ir, 1, 0);
instr->cat1.src_type = type_mov;
instr->cat1.dst_type = type_mov;
add_dst_reg(ctx, instr, &tmp_dst, j);
add_src_reg(ctx, instr, coord,
src_swiz(coord, order[j]));
}
 
coord = &tmp_src;
 
if (j < 4)
ir3_instr_create(ctx->ir, 0, OPC_NOP)->repeat = 4 - j - 1;
 
break;
}
}
 
instr = ir3_instr_create(ctx->ir, 5, t->opc);
instr->cat5.type = get_type(ctx);
instr->cat5.samp = samp->Index;
instr->cat5.tex = samp->Index;
instr->flags |= flags;
 
r = add_dst_reg(ctx, instr, &inst->Dst[0].Register, 0);
r->wrmask = inst->Dst[0].Register.WriteMask;
 
add_src_reg(ctx, instr, coord, coord->SwizzleX);
 
regmask_set(ctx->needs_sy, r);
}
 
/* CMP(a,b,c) = (a < 0) ? b : c */
static void
trans_cmp(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct ir3_instruction *instr;
struct tgsi_dst_register tmp_dst;
struct tgsi_src_register tmp_src;
struct tgsi_src_register constval;
/* final instruction uses original src1 and src2, so we need get_dst() */
struct tgsi_dst_register *dst = get_dst(ctx, inst);
 
get_internal_temp(ctx, &tmp_dst, &tmp_src);
 
/* cmps.f.ge tmp, src0, 0.0 */
instr = ir3_instr_create(ctx->ir, 2, OPC_CMPS_F);
instr->cat2.condition = IR3_COND_GE;
get_immediate(ctx, &constval, fui(0.0));
vectorize(ctx, instr, &tmp_dst, 2,
&inst->Src[0].Register, 0,
&constval, 0);
 
/* add.s tmp, tmp, -1 */
instr = ir3_instr_create(ctx->ir, 2, OPC_ADD_S);
instr->repeat = 3;
add_dst_reg(ctx, instr, &tmp_dst, 0);
add_src_reg(ctx, instr, &tmp_src, 0);
ir3_reg_create(instr, 0, IR3_REG_IMMED)->iim_val = -1;
 
/* sel.{f32,f16} dst, src2, tmp, src1 */
instr = ir3_instr_create(ctx->ir, 3, ctx->so->half_precision ?
OPC_SEL_F16 : OPC_SEL_F32);
vectorize(ctx, instr, &inst->Dst[0].Register, 3,
&inst->Src[2].Register, 0,
&tmp_src, 0,
&inst->Src[1].Register, 0);
 
put_dst(ctx, inst, dst);
}
 
/*
* Conditional / Flow control
*/
 
static unsigned
find_instruction(struct fd3_compile_context *ctx, struct ir3_instruction *instr)
{
unsigned i;
for (i = 0; i < ctx->ir->instrs_count; i++)
if (ctx->ir->instrs[i] == instr)
return i;
return ~0;
}
 
static void
push_branch(struct fd3_compile_context *ctx, struct ir3_instruction *instr)
{
ctx->branch[ctx->branch_count++] = instr;
}
 
static void
pop_branch(struct fd3_compile_context *ctx)
{
struct ir3_instruction *instr;
 
/* if we were clever enough, we'd patch this up after the fact,
* and set (jp) flag on whatever the next instruction was, rather
* than inserting an extra nop..
*/
instr = ir3_instr_create(ctx->ir, 0, OPC_NOP);
instr->flags |= IR3_INSTR_JP;
 
/* pop the branch instruction from the stack and fix up branch target: */
instr = ctx->branch[--ctx->branch_count];
instr->cat0.immed = ctx->ir->instrs_count - find_instruction(ctx, instr) - 1;
}
 
/* We probably don't really want to translate if/else/endif into branches..
* the blob driver evaluates both legs of the if and then uses the sel
* instruction to pick which sides of the branch to "keep".. but figuring
* that out will take somewhat more compiler smarts. So hopefully branches
* don't kill performance too badly.
*/
static void
trans_if(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct ir3_instruction *instr;
struct tgsi_src_register *src = &inst->Src[0].Register;
struct tgsi_src_register constval;
 
get_immediate(ctx, &constval, fui(0.0));
 
instr = ir3_instr_create(ctx->ir, 2, OPC_CMPS_F);
ir3_reg_create(instr, regid(REG_P0, 0), 0);
add_src_reg(ctx, instr, &constval, constval.SwizzleX);
add_src_reg(ctx, instr, src, src->SwizzleX);
instr->cat2.condition = IR3_COND_EQ;
 
instr = ir3_instr_create(ctx->ir, 0, OPC_BR);
push_branch(ctx, instr);
}
 
static void
trans_else(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct ir3_instruction *instr;
 
/* for first half of if/else/endif, generate a jump past the else: */
instr = ir3_instr_create(ctx->ir, 0, OPC_JUMP);
 
pop_branch(ctx);
push_branch(ctx, instr);
}
 
static void
trans_endif(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
pop_branch(ctx);
}
 
/*
* Handlers for TGSI instructions which do have 1:1 mapping to native
* instructions:
*/
 
static void
instr_cat0(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
ir3_instr_create(ctx->ir, 0, t->opc);
}
 
static void
instr_cat1(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct tgsi_dst_register *dst = get_dst(ctx, inst);
struct tgsi_src_register *src = &inst->Src[0].Register;
 
/* mov instructions can't handle a negate on src: */
if (src->Negate) {
struct tgsi_src_register constval;
struct ir3_instruction *instr;
 
/* since right now, we are using uniformly either TYPE_F16 or
* TYPE_F32, and we don't utilize the conversion possibilities
* of mov instructions, we can get away with substituting an
* add.f which can handle negate. Might need to revisit this
* in the future if we start supporting widening/narrowing or
* conversion to/from integer..
*/
instr = ir3_instr_create(ctx->ir, 2, OPC_ADD_F);
get_immediate(ctx, &constval, fui(0.0));
vectorize(ctx, instr, dst, 2, src, 0, &constval, 0);
} else {
create_mov(ctx, dst, src);
/* create_mov() generates vector sequence, so no vectorize() */
}
put_dst(ctx, inst, dst);
}
 
static void
instr_cat2(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct tgsi_dst_register *dst = get_dst(ctx, inst);
struct ir3_instruction *instr;
unsigned src0_flags = 0;
 
instr = ir3_instr_create(ctx->ir, 2, t->opc);
 
switch (t->tgsi_opc) {
case TGSI_OPCODE_SLT:
case TGSI_OPCODE_SGE:
instr->cat2.condition = t->arg;
break;
case TGSI_OPCODE_ABS:
src0_flags = IR3_REG_ABS;
break;
}
 
switch (t->opc) {
case OPC_ABSNEG_F:
case OPC_ABSNEG_S:
case OPC_CLZ_B:
case OPC_CLZ_S:
case OPC_SIGN_F:
case OPC_FLOOR_F:
case OPC_CEIL_F:
case OPC_RNDNE_F:
case OPC_RNDAZ_F:
case OPC_TRUNC_F:
case OPC_NOT_B:
case OPC_BFREV_B:
case OPC_SETRM:
case OPC_CBITS_B:
/* these only have one src reg */
vectorize(ctx, instr, dst, 1,
&inst->Src[0].Register, src0_flags);
break;
default:
vectorize(ctx, instr, dst, 2,
&inst->Src[0].Register, src0_flags,
&inst->Src[1].Register, 0);
break;
}
 
put_dst(ctx, inst, dst);
}
 
static void
instr_cat3(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct tgsi_dst_register *dst = get_dst(ctx, inst);
struct tgsi_src_register *src1 = &inst->Src[1].Register;
struct tgsi_dst_register tmp_dst;
struct tgsi_src_register tmp_src;
struct ir3_instruction *instr;
 
/* Blob compiler never seems to use a const in src1 position..
* although there does seem (according to disassembler hidden
* in libllvm-a3xx.so) to be a bit to indicate that src1 is a
* const. Not sure if this is a hw bug, or simply that the
* disassembler lies.
*/
if ((src1->File == TGSI_FILE_CONSTANT) ||
(src1->File == TGSI_FILE_IMMEDIATE)) {
get_internal_temp(ctx, &tmp_dst, &tmp_src);
create_mov(ctx, &tmp_dst, src1);
src1 = &tmp_src;
}
 
instr = ir3_instr_create(ctx->ir, 3,
ctx->so->half_precision ? t->hopc : t->opc);
vectorize(ctx, instr, dst, 3,
&inst->Src[0].Register, 0,
src1, 0,
&inst->Src[2].Register, 0);
put_dst(ctx, inst, dst);
}
 
static void
instr_cat4(const struct instr_translater *t,
struct fd3_compile_context *ctx,
struct tgsi_full_instruction *inst)
{
struct tgsi_dst_register *dst = get_dst(ctx, inst);
struct ir3_instruction *instr;
 
ir3_instr_create(ctx->ir, 0, OPC_NOP)->repeat = 5;
instr = ir3_instr_create(ctx->ir, 4, t->opc);
 
vectorize(ctx, instr, dst, 1,
&inst->Src[0].Register, 0);
 
regmask_set(ctx->needs_ss, instr->regs[0]);
 
put_dst(ctx, inst, dst);
}
 
static const struct instr_translater translaters[TGSI_OPCODE_LAST] = {
#define INSTR(n, f, ...) \
[TGSI_OPCODE_ ## n] = { .fxn = (f), .tgsi_opc = TGSI_OPCODE_ ## n, ##__VA_ARGS__ }
 
INSTR(MOV, instr_cat1),
INSTR(RCP, instr_cat4, .opc = OPC_RCP),
INSTR(RSQ, instr_cat4, .opc = OPC_RSQ),
INSTR(SQRT, instr_cat4, .opc = OPC_SQRT),
INSTR(MUL, instr_cat2, .opc = OPC_MUL_F),
INSTR(ADD, instr_cat2, .opc = OPC_ADD_F),
INSTR(DP2, trans_dotp, .arg = 2),
INSTR(DP3, trans_dotp, .arg = 3),
INSTR(DP4, trans_dotp, .arg = 4),
INSTR(DPH, trans_dotp, .arg = 3), /* almost like DP3 */
INSTR(MIN, instr_cat2, .opc = OPC_MIN_F),
INSTR(MAX, instr_cat2, .opc = OPC_MAX_F),
INSTR(SLT, instr_cat2, .opc = OPC_CMPS_F, .arg = IR3_COND_LT),
INSTR(SGE, instr_cat2, .opc = OPC_CMPS_F, .arg = IR3_COND_GE),
INSTR(MAD, instr_cat3, .opc = OPC_MAD_F32, .hopc = OPC_MAD_F16),
INSTR(LRP, trans_lrp),
INSTR(FRC, trans_frac),
INSTR(FLR, instr_cat2, .opc = OPC_FLOOR_F),
INSTR(EX2, instr_cat4, .opc = OPC_EXP2),
INSTR(LG2, instr_cat4, .opc = OPC_LOG2),
INSTR(POW, trans_pow),
INSTR(ABS, instr_cat2, .opc = OPC_ABSNEG_F),
INSTR(COS, instr_cat4, .opc = OPC_SIN),
INSTR(SIN, instr_cat4, .opc = OPC_COS),
INSTR(TEX, trans_samp, .opc = OPC_SAM, .arg = TGSI_OPCODE_TEX),
INSTR(TXP, trans_samp, .opc = OPC_SAM, .arg = TGSI_OPCODE_TXP),
INSTR(CMP, trans_cmp),
INSTR(IF, trans_if),
INSTR(ELSE, trans_else),
INSTR(ENDIF, trans_endif),
INSTR(END, instr_cat0, .opc = OPC_END),
};
 
static int
decl_in(struct fd3_compile_context *ctx, struct tgsi_full_declaration *decl)
{
struct fd3_shader_stateobj *so = ctx->so;
unsigned base = ctx->base_reg[TGSI_FILE_INPUT];
unsigned i, flags = 0;
int nop = 0;
 
if (ctx->so->half_precision)
flags |= IR3_REG_HALF;
 
for (i = decl->Range.First; i <= decl->Range.Last; i++) {
unsigned n = so->inputs_count++;
unsigned r = regid(i + base, 0);
unsigned ncomp;
 
/* TODO use ctx->info.input_usage_mask[decl->Range.n] to figure out ncomp: */
ncomp = 4;
 
DBG("decl in -> r%d", i + base); // XXX
 
so->inputs[n].compmask = (1 << ncomp) - 1;
so->inputs[n].regid = r;
so->inputs[n].inloc = ctx->next_inloc;
ctx->next_inloc += ncomp;
 
so->total_in += ncomp;
 
/* for frag shaders, we need to generate the corresponding bary instr: */
if (ctx->type == TGSI_PROCESSOR_FRAGMENT) {
struct ir3_instruction *instr;
 
instr = ir3_instr_create(ctx->ir, 2, OPC_BARY_F);
instr->repeat = ncomp - 1;
 
/* dst register: */
ctx->last_input = ir3_reg_create(instr, r, flags);
 
/* input position: */
ir3_reg_create(instr, 0, IR3_REG_IMMED | IR3_REG_R)->iim_val =
so->inputs[n].inloc - 8;
 
/* input base (always r0.x): */
ir3_reg_create(instr, regid(0,0), 0);
 
nop = 6;
}
}
 
return nop;
}
 
static void
decl_out(struct fd3_compile_context *ctx, struct tgsi_full_declaration *decl)
{
struct fd3_shader_stateobj *so = ctx->so;
unsigned base = ctx->base_reg[TGSI_FILE_OUTPUT];
unsigned name = decl->Semantic.Name;
unsigned i;
 
assert(decl->Declaration.Semantic); // TODO is this ever not true?
 
DBG("decl out[%d] -> r%d", name, decl->Range.First + base); // XXX
 
if (ctx->type == TGSI_PROCESSOR_VERTEX) {
switch (name) {
case TGSI_SEMANTIC_POSITION:
so->pos_regid = regid(decl->Range.First + base, 0);
break;
case TGSI_SEMANTIC_PSIZE:
so->psize_regid = regid(decl->Range.First + base, 0);
break;
case TGSI_SEMANTIC_COLOR:
case TGSI_SEMANTIC_GENERIC:
case TGSI_SEMANTIC_FOG:
case TGSI_SEMANTIC_TEXCOORD:
for (i = decl->Range.First; i <= decl->Range.Last; i++)
so->outputs[so->outputs_count++].regid = regid(i + base, 0);
break;
default:
DBG("unknown VS semantic name: %s",
tgsi_semantic_names[name]);
assert(0);
}
} else {
switch (name) {
case TGSI_SEMANTIC_COLOR:
so->color_regid = regid(decl->Range.First + base, 0);
break;
default:
DBG("unknown VS semantic name: %s",
tgsi_semantic_names[name]);
assert(0);
}
}
}
 
static void
decl_samp(struct fd3_compile_context *ctx, struct tgsi_full_declaration *decl)
{
ctx->so->samplers_count++;
}
 
static void
compile_instructions(struct fd3_compile_context *ctx)
{
struct ir3_shader *ir = ctx->ir;
int nop = 0;
 
while (!tgsi_parse_end_of_tokens(&ctx->parser)) {
tgsi_parse_token(&ctx->parser);
 
switch (ctx->parser.FullToken.Token.Type) {
case TGSI_TOKEN_TYPE_DECLARATION: {
struct tgsi_full_declaration *decl =
&ctx->parser.FullToken.FullDeclaration;
if (decl->Declaration.File == TGSI_FILE_OUTPUT) {
decl_out(ctx, decl);
} else if (decl->Declaration.File == TGSI_FILE_INPUT) {
nop = decl_in(ctx, decl);
} else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
decl_samp(ctx, decl);
}
break;
}
case TGSI_TOKEN_TYPE_IMMEDIATE: {
/* TODO: if we know the immediate is small enough, and only
* used with instructions that can embed an immediate, we
* can skip this:
*/
struct tgsi_full_immediate *imm =
&ctx->parser.FullToken.FullImmediate;
unsigned n = ctx->so->immediates_count++;
memcpy(ctx->so->immediates[n].val, imm->u, 16);
break;
}
case TGSI_TOKEN_TYPE_INSTRUCTION: {
struct tgsi_full_instruction *inst =
&ctx->parser.FullToken.FullInstruction;
unsigned opc = inst->Instruction.Opcode;
const struct instr_translater *t = &translaters[opc];
 
if (nop) {
ir3_instr_create(ctx->ir, 0, OPC_NOP)->repeat = nop - 1;
nop = 0;
}
 
if (t->fxn) {
t->fxn(t, ctx, inst);
ctx->num_internal_temps = 0;
} else {
debug_printf("unknown TGSI opc: %s\n",
tgsi_get_opcode_name(opc));
tgsi_dump(ctx->tokens, 0);
assert(0);
}
 
break;
}
default:
break;
}
}
 
if (ir->instrs_count > 0)
ir->instrs[0]->flags |= IR3_INSTR_SS | IR3_INSTR_SY;
 
if (ctx->last_input)
ctx->last_input->flags |= IR3_REG_EI;
}
 
int
fd3_compile_shader(struct fd3_shader_stateobj *so,
const struct tgsi_token *tokens)
{
struct fd3_compile_context ctx;
 
assert(!so->ir);
 
so->ir = ir3_shader_create();
 
so->color_regid = regid(63,0);
so->pos_regid = regid(63,0);
so->psize_regid = regid(63,0);
 
if (compile_init(&ctx, so, tokens) != TGSI_PARSE_OK)
return -1;
 
compile_instructions(&ctx);
 
compile_free(&ctx);
 
return 0;
}