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gerrit-public.fairphone.software / fp2-dev / platform / external / mesa3d / 562c127693200822f04a145db50add1be2425d7b / . / src / gallium / drivers / cell / ppu / cell_gen_fp.c
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/**************************************************************************
*
* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
* Copyright 2009 VMware, Inc. All rights reserved.
*
* 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, sub license, 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/**
* Generate SPU fragment program/shader code.
*
* Note that we generate SOA-style code here. So each TGSI instruction
* operates on four pixels (and is translated into four SPU instructions,
* generally speaking).
*
* \author Brian Paul
*/
#include <math.h>
#include "pipe/p_defines.h"
#include "pipe/p_state.h"
#include "pipe/p_shader_tokens.h"
#include "tgsi/tgsi_parse.h"
#include "tgsi/tgsi_util.h"
#include "tgsi/tgsi_exec.h"
#include "tgsi/tgsi_dump.h"
#include "rtasm/rtasm_ppc_spe.h"
#include "util/u_memory.h"
#include "cell_context.h"
#include "cell_gen_fp.h"
#define MAX_TEMPS 16
#define MAX_IMMED 8
#define CHAN_X 0
#define CHAN_Y 1
#define CHAN_Z 2
#define CHAN_W 3
/**
* Context needed during code generation.
*/
struct codegen
{
struct cell_context *cell;
int inputs_reg; /**< 1st function parameter */
int outputs_reg; /**< 2nd function parameter */
int constants_reg; /**< 3rd function parameter */
int temp_regs[MAX_TEMPS][4]; /**< maps TGSI temps to SPE registers */
int imm_regs[MAX_IMMED][4]; /**< maps TGSI immediates to SPE registers */
int num_imm; /**< number of immediates */
int one_reg; /**< register containing {1.0, 1.0, 1.0, 1.0} */
int addr_reg; /**< address register, integer values */
/** Per-instruction temps / intermediate temps */
int num_itemps;
int itemps[12];
/** Current IF/ELSE/ENDIF nesting level */
int if_nesting;
/** Current BGNLOOP/ENDLOOP nesting level */
int loop_nesting;
/** Location of start of current loop */
int loop_start;
/** Index of if/conditional mask register */
int cond_mask_reg;
/** Index of loop mask register */
int loop_mask_reg;
/** Index of master execution mask register */
int exec_mask_reg;
/** KIL mask: indicates which fragments have been killed */
int kill_mask_reg;
int frame_size; /**< Stack frame size, in words */
struct spe_function *f;
boolean error;
};
/**
* Allocate an intermediate temporary register.
*/
static int
get_itemp(struct codegen *gen)
{
int t = spe_allocate_available_register(gen->f);
assert(gen->num_itemps < Elements(gen->itemps));
gen->itemps[gen->num_itemps++] = t;
return t;
}
/**
* Free all intermediate temporary registers. To be called after each
* instruction has been emitted.
*/
static void
free_itemps(struct codegen *gen)
{
int i;
for (i = 0; i < gen->num_itemps; i++) {
spe_release_register(gen->f, gen->itemps[i]);
}
gen->num_itemps = 0;
}
/**
* Return index of an SPE register containing {1.0, 1.0, 1.0, 1.0}.
* The register is allocated and initialized upon the first call.
*/
static int
get_const_one_reg(struct codegen *gen)
{
if (gen->one_reg <= 0) {
gen->one_reg = spe_allocate_available_register(gen->f);
spe_indent(gen->f, 4);
spe_comment(gen->f, -4, "init constant reg = 1.0:");
/* one = {1.0, 1.0, 1.0, 1.0} */
spe_load_float(gen->f, gen->one_reg, 1.0f);
spe_indent(gen->f, -4);
}
return gen->one_reg;
}
/**
* Return index of the address register.
* Used for indirect register loads/stores.
*/
static int
get_address_reg(struct codegen *gen)
{
if (gen->addr_reg <= 0) {
gen->addr_reg = spe_allocate_available_register(gen->f);
spe_indent(gen->f, 4);
spe_comment(gen->f, -4, "init address reg = 0:");
/* init addr = {0, 0, 0, 0} */
spe_zero(gen->f, gen->addr_reg);
spe_indent(gen->f, -4);
}
return gen->addr_reg;
}
/**
* Return index of the master execution mask.
* The register is allocated an initialized upon the first call.
*
* The master execution mask controls which pixels in a quad are
* modified, according to surrounding conditionals, loops, etc.
*/
static int
get_exec_mask_reg(struct codegen *gen)
{
if (gen->exec_mask_reg <= 0) {
gen->exec_mask_reg = spe_allocate_available_register(gen->f);
/* XXX this may not be needed */
spe_comment(gen->f, 0*-4, "initialize master execution mask = ~0");
spe_load_int(gen->f, gen->exec_mask_reg, ~0);
}
return gen->exec_mask_reg;
}
/** Return index of the conditional (if/else) execution mask register */
static int
get_cond_mask_reg(struct codegen *gen)
{
if (gen->cond_mask_reg <= 0) {
gen->cond_mask_reg = spe_allocate_available_register(gen->f);
}
return gen->cond_mask_reg;
}
/** Return index of the loop execution mask register */
static int
get_loop_mask_reg(struct codegen *gen)
{
if (gen->loop_mask_reg <= 0) {
gen->loop_mask_reg = spe_allocate_available_register(gen->f);
}
return gen->loop_mask_reg;
}
static boolean
is_register_src(struct codegen *gen, int channel,
const struct tgsi_full_src_register *src)
{
int swizzle = tgsi_util_get_full_src_register_swizzle(src, channel);
int sign_op = tgsi_util_get_full_src_register_sign_mode(src, channel);
if (swizzle > TGSI_SWIZZLE_W || sign_op != TGSI_UTIL_SIGN_KEEP) {
return FALSE;
}
if (src->Register.File == TGSI_FILE_TEMPORARY ||
src->Register.File == TGSI_FILE_IMMEDIATE) {
return TRUE;
}
return FALSE;
}
static boolean
is_memory_dst(struct codegen *gen, int channel,
const struct tgsi_full_dst_register *dst)
{
if (dst->Register.File == TGSI_FILE_OUTPUT) {
return TRUE;
}
else {
return FALSE;
}
}
/**
* Return the index of the SPU temporary containing the named TGSI
* source register. If the TGSI register is a TGSI_FILE_TEMPORARY we
* just return the corresponding SPE register. If the TGIS register
* is TGSI_FILE_INPUT/CONSTANT/IMMEDIATE we allocate a new SPE register
* and emit an SPE load instruction.
*/
static int
get_src_reg(struct codegen *gen,
int channel,
const struct tgsi_full_src_register *src)
{
int reg = -1;
int swizzle = tgsi_util_get_full_src_register_swizzle(src, channel);
boolean reg_is_itemp = FALSE;
uint sign_op;
assert(swizzle >= TGSI_SWIZZLE_X);
assert(swizzle <= TGSI_SWIZZLE_W);
{
int index = src->Register.Index;
assert(swizzle < 4);
if (src->Register.Indirect) {
/* XXX unfinished */
}
switch (src->Register.File) {
case TGSI_FILE_TEMPORARY:
reg = gen->temp_regs[index][swizzle];
break;
case TGSI_FILE_INPUT:
{
/* offset is measured in quadwords, not bytes */
int offset = index * 4 + swizzle;
reg = get_itemp(gen);
reg_is_itemp = TRUE;
/* Load: reg = memory[(machine_reg) + offset] */
spe_lqd(gen->f, reg, gen->inputs_reg, offset * 16);
}
break;
case TGSI_FILE_IMMEDIATE:
reg = gen->imm_regs[index][swizzle];
break;
case TGSI_FILE_CONSTANT:
{
/* offset is measured in quadwords, not bytes */
int offset = index * 4 + swizzle;
reg = get_itemp(gen);
reg_is_itemp = TRUE;
/* Load: reg = memory[(machine_reg) + offset] */
spe_lqd(gen->f, reg, gen->constants_reg, offset * 16);
}
break;
default:
assert(0);
}
}
/*
* Handle absolute value, negate or set-negative of src register.
*/
sign_op = tgsi_util_get_full_src_register_sign_mode(src, channel);
if (sign_op != TGSI_UTIL_SIGN_KEEP) {
/*
* All sign ops are done by manipulating bit 31, the IEEE float sign bit.
*/
const int bit31mask_reg = get_itemp(gen);
int result_reg;
if (reg_is_itemp) {
/* re-use 'reg' for the result */
result_reg = reg;
}
else {
/* alloc a new reg for the result */
result_reg = get_itemp(gen);
}
/* mask with bit 31 set, the rest cleared */
spe_load_uint(gen->f, bit31mask_reg, (1 << 31));
if (sign_op == TGSI_UTIL_SIGN_CLEAR) {
spe_andc(gen->f, result_reg, reg, bit31mask_reg);
}
else if (sign_op == TGSI_UTIL_SIGN_SET) {
spe_and(gen->f, result_reg, reg, bit31mask_reg);
}
else {
assert(sign_op == TGSI_UTIL_SIGN_TOGGLE);
spe_xor(gen->f, result_reg, reg, bit31mask_reg);
}
reg = result_reg;
}
return reg;
}
/**
* Return the index of an SPE register to use for the given TGSI register.
* If the TGSI register is TGSI_FILE_TEMPORARAY, the index of the
* corresponding SPE register is returned. If the TGSI register is
* TGSI_FILE_OUTPUT we allocate an intermediate temporary register.
* See store_dest_reg() below...
*/
static int
get_dst_reg(struct codegen *gen,
int channel,
const struct tgsi_full_dst_register *dest)
{
int reg = -1;
switch (dest->Register.File) {
case TGSI_FILE_TEMPORARY:
if (gen->if_nesting > 0 || gen->loop_nesting > 0)
reg = get_itemp(gen);
else
reg = gen->temp_regs[dest->Register.Index][channel];
break;
case TGSI_FILE_OUTPUT:
reg = get_itemp(gen);
break;
default:
assert(0);
}
return reg;
}
/**
* When a TGSI instruction is writing to an output register, this
* function emits the SPE store instruction to store the value_reg.
* \param value_reg the SPE register containing the value to store.
* This would have been returned by get_dst_reg().
*/
static void
store_dest_reg(struct codegen *gen,
int value_reg, int channel,
const struct tgsi_full_dst_register *dest)
{
/*
* XXX need to implement dst reg clamping/saturation
*/
#if 0
switch (inst->Instruction.Saturate) {
case TGSI_SAT_NONE:
break;
case TGSI_SAT_ZERO_ONE:
break;
case TGSI_SAT_MINUS_PLUS_ONE:
break;
default:
assert( 0 );
}
#endif
switch (dest->Register.File) {
case TGSI_FILE_TEMPORARY:
if (gen->if_nesting > 0 || gen->loop_nesting > 0) {
int d_reg = gen->temp_regs[dest->Register.Index][channel];
int exec_reg = get_exec_mask_reg(gen);
/* Mix d with new value according to exec mask:
* d[i] = mask_reg[i] ? value_reg : d_reg
*/
spe_selb(gen->f, d_reg, d_reg, value_reg, exec_reg);
}
else {
/* we're not inside a condition or loop: do nothing special */
}
break;
case TGSI_FILE_OUTPUT:
{
/* offset is measured in quadwords, not bytes */
int offset = dest->Register.Index * 4 + channel;
if (gen->if_nesting > 0 || gen->loop_nesting > 0) {
int exec_reg = get_exec_mask_reg(gen);
int curval_reg = get_itemp(gen);
/* First read the current value from memory:
* Load: curval = memory[(machine_reg) + offset]
*/
spe_lqd(gen->f, curval_reg, gen->outputs_reg, offset * 16);
/* Mix curval with newvalue according to exec mask:
* d[i] = mask_reg[i] ? value_reg : d_reg
*/
spe_selb(gen->f, curval_reg, curval_reg, value_reg, exec_reg);
/* Store: memory[(machine_reg) + offset] = curval */
spe_stqd(gen->f, curval_reg, gen->outputs_reg, offset * 16);
}
else {
/* Store: memory[(machine_reg) + offset] = reg */
spe_stqd(gen->f, value_reg, gen->outputs_reg, offset * 16);
}
}
break;
default:
assert(0);
}
}
static void
emit_prologue(struct codegen *gen)
{
gen->frame_size = 1024; /* XXX temporary, should be dynamic */
spe_comment(gen->f, 0, "Function prologue:");
/* save $lr on stack # stqd $lr,16($sp) */
spe_stqd(gen->f, SPE_REG_RA, SPE_REG_SP, 16);
if (gen->frame_size >= 512) {
/* offset is too large for ai instruction */
int offset_reg = spe_allocate_available_register(gen->f);
int sp_reg = spe_allocate_available_register(gen->f);
/* offset = -framesize */
spe_load_int(gen->f, offset_reg, -gen->frame_size);
/* sp = $sp */
spe_move(gen->f, sp_reg, SPE_REG_SP);
/* $sp = $sp + offset_reg */
spe_a(gen->f, SPE_REG_SP, SPE_REG_SP, offset_reg);
/* save $sp in stack frame */
spe_stqd(gen->f, sp_reg, SPE_REG_SP, 0);
/* clean up */
spe_release_register(gen->f, offset_reg);
spe_release_register(gen->f, sp_reg);
}
else {
/* save stack pointer # stqd $sp,-frameSize($sp) */
spe_stqd(gen->f, SPE_REG_SP, SPE_REG_SP, -gen->frame_size);
/* adjust stack pointer # ai $sp,$sp,-frameSize */
spe_ai(gen->f, SPE_REG_SP, SPE_REG_SP, -gen->frame_size);
}
}
static void
emit_epilogue(struct codegen *gen)
{
const int return_reg = 3;
spe_comment(gen->f, 0, "Function epilogue:");
spe_comment(gen->f, 0, "return the killed mask");
if (gen->kill_mask_reg > 0) {
/* shader called KIL, return the "alive" mask */
spe_move(gen->f, return_reg, gen->kill_mask_reg);
}
else {
/* return {0,0,0,0} */
spe_load_uint(gen->f, return_reg, 0);
}
spe_comment(gen->f, 0, "restore stack and return");
if (gen->frame_size >= 512) {
/* offset is too large for ai instruction */
int offset_reg = spe_allocate_available_register(gen->f);
/* offset = framesize */
spe_load_int(gen->f, offset_reg, gen->frame_size);
/* $sp = $sp + offset */
spe_a(gen->f, SPE_REG_SP, SPE_REG_SP, offset_reg);
/* clean up */
spe_release_register(gen->f, offset_reg);
}
else {
/* restore stack pointer # ai $sp,$sp,frameSize */
spe_ai(gen->f, SPE_REG_SP, SPE_REG_SP, gen->frame_size);
}
/* restore $lr # lqd $lr,16($sp) */
spe_lqd(gen->f, SPE_REG_RA, SPE_REG_SP, 16);
/* return from function call */
spe_bi(gen->f, SPE_REG_RA, 0, 0);
}
#define FOR_EACH_ENABLED_CHANNEL(inst, ch) \
for (ch = 0; ch < 4; ch++) \
if (inst->Dst[0].Register.WriteMask & (1 << ch))
static boolean
emit_ARL(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch = 0, src_reg, addr_reg;
src_reg = get_src_reg(gen, ch, &inst->Src[0]);
addr_reg = get_address_reg(gen);
/* convert float to int */
spe_cflts(gen->f, addr_reg, src_reg, 0);
free_itemps(gen);
return TRUE;
}
static boolean
emit_MOV(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, src_reg[4], dst_reg[4];
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
src_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
dst_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
if (is_register_src(gen, ch, &inst->Src[0]) &&
is_memory_dst(gen, ch, &inst->Dst[0])) {
/* special-case: register to memory store */
store_dest_reg(gen, src_reg[ch], ch, &inst->Dst[0]);
}
else {
spe_move(gen->f, dst_reg[ch], src_reg[ch]);
store_dest_reg(gen, dst_reg[ch], ch, &inst->Dst[0]);
}
}
free_itemps(gen);
return TRUE;
}
/**
* Emit binary operation
*/
static boolean
emit_binop(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s1_reg[4], s2_reg[4], d_reg[4];
/* Loop over Red/Green/Blue/Alpha channels, fetch src operands */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
s2_reg[ch] = get_src_reg(gen, ch, &inst->Src[1]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
}
/* Loop over Red/Green/Blue/Alpha channels, do the op, store results */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
/* Emit actual SPE instruction: d = s1 + s2 */
switch (inst->Instruction.Opcode) {
case TGSI_OPCODE_ADD:
spe_fa(gen->f, d_reg[ch], s1_reg[ch], s2_reg[ch]);
break;
case TGSI_OPCODE_SUB:
spe_fs(gen->f, d_reg[ch], s1_reg[ch], s2_reg[ch]);
break;
case TGSI_OPCODE_MUL:
spe_fm(gen->f, d_reg[ch], s1_reg[ch], s2_reg[ch]);
break;
default:
;
}
}
/* Store the result (a no-op for TGSI_FILE_TEMPORARY dests) */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
/* Free any intermediate temps we allocated */
free_itemps(gen);
return TRUE;
}
/**
* Emit multiply add. See emit_ADD for comments.
*/
static boolean
emit_MAD(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s1_reg[4], s2_reg[4], s3_reg[4], d_reg[4];
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
s2_reg[ch] = get_src_reg(gen, ch, &inst->Src[1]);
s3_reg[ch] = get_src_reg(gen, ch, &inst->Src[2]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_fma(gen->f, d_reg[ch], s1_reg[ch], s2_reg[ch], s3_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit linear interpolate. See emit_ADD for comments.
*/
static boolean
emit_LRP(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s1_reg[4], s2_reg[4], s3_reg[4], d_reg[4], tmp_reg[4];
/* setup/get src/dst/temp regs */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
s2_reg[ch] = get_src_reg(gen, ch, &inst->Src[1]);
s3_reg[ch] = get_src_reg(gen, ch, &inst->Src[2]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
tmp_reg[ch] = get_itemp(gen);
}
/* d = s3 + s1(s2 - s3) */
/* do all subtracts, then all fma, then all stores to better pipeline */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_fs(gen->f, tmp_reg[ch], s2_reg[ch], s3_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_fma(gen->f, d_reg[ch], tmp_reg[ch], s1_reg[ch], s3_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit reciprocal or recip sqrt.
*/
static boolean
emit_RCP_RSQ(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s1_reg[4], d_reg[4], tmp_reg[4];
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
tmp_reg[ch] = get_itemp(gen);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
if (inst->Instruction.Opcode == TGSI_OPCODE_RCP) {
/* tmp = 1/s1 */
spe_frest(gen->f, tmp_reg[ch], s1_reg[ch]);
}
else {
/* tmp = 1/sqrt(s1) */
spe_frsqest(gen->f, tmp_reg[ch], s1_reg[ch]);
}
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
/* d = float_interp(s1, tmp) */
spe_fi(gen->f, d_reg[ch], s1_reg[ch], tmp_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit absolute value. See emit_ADD for comments.
*/
static boolean
emit_ABS(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s1_reg[4], d_reg[4];
const int bit31mask_reg = get_itemp(gen);
/* mask with bit 31 set, the rest cleared */
spe_load_uint(gen->f, bit31mask_reg, (1 << 31));
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
}
/* d = sign bit cleared in s1 */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_andc(gen->f, d_reg[ch], s1_reg[ch], bit31mask_reg);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit 3 component dot product. See emit_ADD for comments.
*/
static boolean
emit_DP3(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch;
int s1x_reg, s1y_reg, s1z_reg;
int s2x_reg, s2y_reg, s2z_reg;
int t0_reg = get_itemp(gen), t1_reg = get_itemp(gen);
s1x_reg = get_src_reg(gen, CHAN_X, &inst->Src[0]);
s2x_reg = get_src_reg(gen, CHAN_X, &inst->Src[1]);
s1y_reg = get_src_reg(gen, CHAN_Y, &inst->Src[0]);
s2y_reg = get_src_reg(gen, CHAN_Y, &inst->Src[1]);
s1z_reg = get_src_reg(gen, CHAN_Z, &inst->Src[0]);
s2z_reg = get_src_reg(gen, CHAN_Z, &inst->Src[1]);
/* t0 = x0 * x1 */
spe_fm(gen->f, t0_reg, s1x_reg, s2x_reg);
/* t1 = y0 * y1 */
spe_fm(gen->f, t1_reg, s1y_reg, s2y_reg);
/* t0 = z0 * z1 + t0 */
spe_fma(gen->f, t0_reg, s1z_reg, s2z_reg, t0_reg);
/* t0 = t0 + t1 */
spe_fa(gen->f, t0_reg, t0_reg, t1_reg);
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
int d_reg = get_dst_reg(gen, ch, &inst->Dst[0]);
spe_move(gen->f, d_reg, t0_reg);
store_dest_reg(gen, d_reg, ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit 4 component dot product. See emit_ADD for comments.
*/
static boolean
emit_DP4(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch;
int s0x_reg, s0y_reg, s0z_reg, s0w_reg;
int s1x_reg, s1y_reg, s1z_reg, s1w_reg;
int t0_reg = get_itemp(gen), t1_reg = get_itemp(gen);
s0x_reg = get_src_reg(gen, CHAN_X, &inst->Src[0]);
s1x_reg = get_src_reg(gen, CHAN_X, &inst->Src[1]);
s0y_reg = get_src_reg(gen, CHAN_Y, &inst->Src[0]);
s1y_reg = get_src_reg(gen, CHAN_Y, &inst->Src[1]);
s0z_reg = get_src_reg(gen, CHAN_Z, &inst->Src[0]);
s1z_reg = get_src_reg(gen, CHAN_Z, &inst->Src[1]);
s0w_reg = get_src_reg(gen, CHAN_W, &inst->Src[0]);
s1w_reg = get_src_reg(gen, CHAN_W, &inst->Src[1]);
/* t0 = x0 * x1 */
spe_fm(gen->f, t0_reg, s0x_reg, s1x_reg);
/* t1 = y0 * y1 */
spe_fm(gen->f, t1_reg, s0y_reg, s1y_reg);
/* t0 = z0 * z1 + t0 */
spe_fma(gen->f, t0_reg, s0z_reg, s1z_reg, t0_reg);
/* t1 = w0 * w1 + t1 */
spe_fma(gen->f, t1_reg, s0w_reg, s1w_reg, t1_reg);
/* t0 = t0 + t1 */
spe_fa(gen->f, t0_reg, t0_reg, t1_reg);
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
int d_reg = get_dst_reg(gen, ch, &inst->Dst[0]);
spe_move(gen->f, d_reg, t0_reg);
store_dest_reg(gen, d_reg, ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit homogeneous dot product. See emit_ADD for comments.
*/
static boolean
emit_DPH(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
/* XXX rewrite this function to look more like DP3/DP4 */
int ch;
int s1_reg = get_src_reg(gen, CHAN_X, &inst->Src[0]);
int s2_reg = get_src_reg(gen, CHAN_X, &inst->Src[1]);
int tmp_reg = get_itemp(gen);
/* t = x0 * x1 */
spe_fm(gen->f, tmp_reg, s1_reg, s2_reg);
s1_reg = get_src_reg(gen, CHAN_Y, &inst->Src[0]);
s2_reg = get_src_reg(gen, CHAN_Y, &inst->Src[1]);
/* t = y0 * y1 + t */
spe_fma(gen->f, tmp_reg, s1_reg, s2_reg, tmp_reg);
s1_reg = get_src_reg(gen, CHAN_Z, &inst->Src[0]);
s2_reg = get_src_reg(gen, CHAN_Z, &inst->Src[1]);
/* t = z0 * z1 + t */
spe_fma(gen->f, tmp_reg, s1_reg, s2_reg, tmp_reg);
s2_reg = get_src_reg(gen, CHAN_W, &inst->Src[1]);
/* t = w1 + t */
spe_fa(gen->f, tmp_reg, s2_reg, tmp_reg);
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
int d_reg = get_dst_reg(gen, ch, &inst->Dst[0]);
spe_move(gen->f, d_reg, tmp_reg);
store_dest_reg(gen, tmp_reg, ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit 3-component vector normalize.
*/
static boolean
emit_NRM3(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch;
int src_reg[3];
int t0_reg = get_itemp(gen), t1_reg = get_itemp(gen);
src_reg[0] = get_src_reg(gen, CHAN_X, &inst->Src[0]);
src_reg[1] = get_src_reg(gen, CHAN_Y, &inst->Src[0]);
src_reg[2] = get_src_reg(gen, CHAN_Z, &inst->Src[0]);
/* t0 = x * x */
spe_fm(gen->f, t0_reg, src_reg[0], src_reg[0]);
/* t1 = y * y */
spe_fm(gen->f, t1_reg, src_reg[1], src_reg[1]);
/* t0 = z * z + t0 */
spe_fma(gen->f, t0_reg, src_reg[2], src_reg[2], t0_reg);
/* t0 = t0 + t1 */
spe_fa(gen->f, t0_reg, t0_reg, t1_reg);
/* t1 = 1.0 / sqrt(t0) */
spe_frsqest(gen->f, t1_reg, t0_reg);
spe_fi(gen->f, t1_reg, t0_reg, t1_reg);
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
int d_reg = get_dst_reg(gen, ch, &inst->Dst[0]);
/* dst = src[ch] * t1 */
spe_fm(gen->f, d_reg, src_reg[ch], t1_reg);
store_dest_reg(gen, d_reg, ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit cross product. See emit_ADD for comments.
*/
static boolean
emit_XPD(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int s1_reg = get_src_reg(gen, CHAN_Z, &inst->Src[0]);
int s2_reg = get_src_reg(gen, CHAN_Y, &inst->Src[1]);
int tmp_reg = get_itemp(gen);
/* t = z0 * y1 */
spe_fm(gen->f, tmp_reg, s1_reg, s2_reg);
s1_reg = get_src_reg(gen, CHAN_Y, &inst->Src[0]);
s2_reg = get_src_reg(gen, CHAN_Z, &inst->Src[1]);
/* t = y0 * z1 - t */
spe_fms(gen->f, tmp_reg, s1_reg, s2_reg, tmp_reg);
if (inst->Dst[0].Register.WriteMask & (1 << CHAN_X)) {
store_dest_reg(gen, tmp_reg, CHAN_X, &inst->Dst[0]);
}
s1_reg = get_src_reg(gen, CHAN_X, &inst->Src[0]);
s2_reg = get_src_reg(gen, CHAN_Z, &inst->Src[1]);
/* t = x0 * z1 */
spe_fm(gen->f, tmp_reg, s1_reg, s2_reg);
s1_reg = get_src_reg(gen, CHAN_Z, &inst->Src[0]);
s2_reg = get_src_reg(gen, CHAN_X, &inst->Src[1]);
/* t = z0 * x1 - t */
spe_fms(gen->f, tmp_reg, s1_reg, s2_reg, tmp_reg);
if (inst->Dst[0].Register.WriteMask & (1 << CHAN_Y)) {
store_dest_reg(gen, tmp_reg, CHAN_Y, &inst->Dst[0]);
}
s1_reg = get_src_reg(gen, CHAN_Y, &inst->Src[0]);
s2_reg = get_src_reg(gen, CHAN_X, &inst->Src[1]);
/* t = y0 * x1 */
spe_fm(gen->f, tmp_reg, s1_reg, s2_reg);
s1_reg = get_src_reg(gen, CHAN_X, &inst->Src[0]);
s2_reg = get_src_reg(gen, CHAN_Y, &inst->Src[1]);
/* t = x0 * y1 - t */
spe_fms(gen->f, tmp_reg, s1_reg, s2_reg, tmp_reg);
if (inst->Dst[0].Register.WriteMask & (1 << CHAN_Z)) {
store_dest_reg(gen, tmp_reg, CHAN_Z, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit inequality instruction.
* Note that the SPE fcgt instruction produces 0x0 and 0xffffffff as
* the result but OpenGL/TGSI needs 0.0 and 1.0 results.
* We can easily convert 0x0/0xffffffff to 0.0/1.0 with a bitwise AND.
*/
static boolean
emit_inequality(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s1_reg[4], s2_reg[4], d_reg[4], one_reg;
boolean complement = FALSE;
one_reg = get_const_one_reg(gen);
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
s2_reg[ch] = get_src_reg(gen, ch, &inst->Src[1]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
switch (inst->Instruction.Opcode) {
case TGSI_OPCODE_SGT:
spe_fcgt(gen->f, d_reg[ch], s1_reg[ch], s2_reg[ch]);
break;
case TGSI_OPCODE_SLT:
spe_fcgt(gen->f, d_reg[ch], s2_reg[ch], s1_reg[ch]);
break;
case TGSI_OPCODE_SGE:
spe_fcgt(gen->f, d_reg[ch], s2_reg[ch], s1_reg[ch]);
complement = TRUE;
break;
case TGSI_OPCODE_SLE:
spe_fcgt(gen->f, d_reg[ch], s1_reg[ch], s2_reg[ch]);
complement = TRUE;
break;
case TGSI_OPCODE_SEQ:
spe_fceq(gen->f, d_reg[ch], s1_reg[ch], s2_reg[ch]);
break;
case TGSI_OPCODE_SNE:
spe_fceq(gen->f, d_reg[ch], s1_reg[ch], s2_reg[ch]);
complement = TRUE;
break;
default:
assert(0);
}
}
/* convert d from 0x0/0xffffffff to 0.0/1.0 */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
/* d = d & one_reg */
if (complement)
spe_andc(gen->f, d_reg[ch], one_reg, d_reg[ch]);
else
spe_and(gen->f, d_reg[ch], one_reg, d_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit compare.
*/
static boolean
emit_CMP(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch;
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
int s1_reg = get_src_reg(gen, ch, &inst->Src[0]);
int s2_reg = get_src_reg(gen, ch, &inst->Src[1]);
int s3_reg = get_src_reg(gen, ch, &inst->Src[2]);
int d_reg = get_dst_reg(gen, ch, &inst->Dst[0]);
int zero_reg = get_itemp(gen);
spe_zero(gen->f, zero_reg);
/* d = (s1 < 0) ? s2 : s3 */
spe_fcgt(gen->f, d_reg, zero_reg, s1_reg);
spe_selb(gen->f, d_reg, s3_reg, s2_reg, d_reg);
store_dest_reg(gen, d_reg, ch, &inst->Dst[0]);
free_itemps(gen);
}
return TRUE;
}
/**
* Emit trunc.
* Convert float to signed int
* Convert signed int to float
*/
static boolean
emit_TRUNC(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s1_reg[4], d_reg[4];
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
}
/* Convert float to int */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_cflts(gen->f, d_reg[ch], s1_reg[ch], 0);
}
/* Convert int to float */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_csflt(gen->f, d_reg[ch], d_reg[ch], 0);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit floor.
* If negative int subtract one
* Convert float to signed int
* Convert signed int to float
*/
static boolean
emit_FLR(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s1_reg[4], d_reg[4], tmp_reg[4], zero_reg, one_reg;
zero_reg = get_itemp(gen);
spe_zero(gen->f, zero_reg);
one_reg = get_const_one_reg(gen);
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
tmp_reg[ch] = get_itemp(gen);
}
/* If negative, subtract 1.0 */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_fcgt(gen->f, tmp_reg[ch], zero_reg, s1_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_selb(gen->f, tmp_reg[ch], zero_reg, one_reg, tmp_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_fs(gen->f, tmp_reg[ch], s1_reg[ch], tmp_reg[ch]);
}
/* Convert float to int */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_cflts(gen->f, tmp_reg[ch], tmp_reg[ch], 0);
}
/* Convert int to float */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_csflt(gen->f, d_reg[ch], tmp_reg[ch], 0);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Compute frac = Input - FLR(Input)
*/
static boolean
emit_FRC(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s1_reg[4], d_reg[4], tmp_reg[4], zero_reg, one_reg;
zero_reg = get_itemp(gen);
spe_zero(gen->f, zero_reg);
one_reg = get_const_one_reg(gen);
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
tmp_reg[ch] = get_itemp(gen);
}
/* If negative, subtract 1.0 */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_fcgt(gen->f, tmp_reg[ch], zero_reg, s1_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_selb(gen->f, tmp_reg[ch], zero_reg, one_reg, tmp_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_fs(gen->f, tmp_reg[ch], s1_reg[ch], tmp_reg[ch]);
}
/* Convert float to int */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_cflts(gen->f, tmp_reg[ch], tmp_reg[ch], 0);
}
/* Convert int to float */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_csflt(gen->f, tmp_reg[ch], tmp_reg[ch], 0);
}
/* d = s1 - FLR(s1) */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_fs(gen->f, d_reg[ch], s1_reg[ch], tmp_reg[ch]);
}
/* store result */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
#if 0
static void
print_functions(struct cell_context *cell)
{
struct cell_spu_function_info *funcs = &cell->spu_functions;
uint i;
for (i = 0; i < funcs->num; i++) {
printf("SPU func %u: %s at %u\n",
i, funcs->names[i], funcs->addrs[i]);
}
}
#endif
static uint
lookup_function(struct cell_context *cell, const char *funcname)
{
const struct cell_spu_function_info *funcs = &cell->spu_functions;
uint i, addr = 0;
for (i = 0; i < funcs->num; i++) {
if (strcmp(funcs->names[i], funcname) == 0) {
addr = funcs->addrs[i];
}
}
assert(addr && "spu function not found");
return addr / 4; /* discard 2 least significant bits */
}
/**
* Emit code to call a SPU function.
* Used to implement instructions like SIN/COS/POW/TEX/etc.
* If scalar, only the X components of the src regs are used, and the
* result is replicated across the dest register's XYZW components.
*/
static boolean
emit_function_call(struct codegen *gen,
const struct tgsi_full_instruction *inst,
char *funcname, uint num_args, boolean scalar)
{
const uint addr = lookup_function(gen->cell, funcname);
char comment[100];
int s_regs[3];
int func_called = FALSE;
uint a, ch;
int retval_reg = -1;
assert(num_args <= 3);
snprintf(comment, sizeof(comment), "CALL %s:", funcname);
spe_comment(gen->f, -4, comment);
if (scalar) {
for (a = 0; a < num_args; a++) {
s_regs[a] = get_src_reg(gen, CHAN_X, &inst->Src[a]);
}
/* we'll call the function, put the return value in this register,
* then replicate it across all write-enabled components in d_reg.
*/
retval_reg = spe_allocate_available_register(gen->f);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
int d_reg;
ubyte usedRegs[SPE_NUM_REGS];
uint i, numUsed;
if (!scalar) {
for (a = 0; a < num_args; a++) {
s_regs[a] = get_src_reg(gen, ch, &inst->Src[a]);
}
}
d_reg = get_dst_reg(gen, ch, &inst->Dst[0]);
if (!scalar || !func_called) {
/* for a scalar function, we'll really only call the function once */
numUsed = spe_get_registers_used(gen->f, usedRegs);
assert(numUsed < gen->frame_size / 16 - 2);
/* save registers to stack */
for (i = 0; i < numUsed; i++) {
uint reg = usedRegs[i];
int offset = 2 + i;
spe_stqd(gen->f, reg, SPE_REG_SP, 16 * offset);
}
/* setup function arguments */
for (a = 0; a < num_args; a++) {
spe_move(gen->f, 3 + a, s_regs[a]);
}
/* branch to function, save return addr */
spe_brasl(gen->f, SPE_REG_RA, addr);
/* save function's return value */
if (scalar)
spe_move(gen->f, retval_reg, 3);
else
spe_move(gen->f, d_reg, 3);
/* restore registers from stack */
for (i = 0; i < numUsed; i++) {
uint reg = usedRegs[i];
if (reg != d_reg && reg != retval_reg) {
int offset = 2 + i;
spe_lqd(gen->f, reg, SPE_REG_SP, 16 * offset);
}
}
func_called = TRUE;
}
if (scalar) {
spe_move(gen->f, d_reg, retval_reg);
}
store_dest_reg(gen, d_reg, ch, &inst->Dst[0]);
free_itemps(gen);
}
if (scalar) {
spe_release_register(gen->f, retval_reg);
}
return TRUE;
}
static boolean
emit_TEX(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
const uint target = inst->Texture.Texture;
const uint unit = inst->Src[1].Register.Index;
uint addr;
int ch;
int coord_regs[4], d_regs[4];
switch (target) {
case TGSI_TEXTURE_1D:
case TGSI_TEXTURE_2D:
addr = lookup_function(gen->cell, "spu_tex_2d");
break;
case TGSI_TEXTURE_3D:
addr = lookup_function(gen->cell, "spu_tex_3d");
break;
case TGSI_TEXTURE_CUBE:
addr = lookup_function(gen->cell, "spu_tex_cube");
break;
default:
ASSERT(0 && "unsupported texture target");
return FALSE;
}
assert(inst->Src[1].Register.File == TGSI_FILE_SAMPLER);
spe_comment(gen->f, -4, "CALL tex:");
/* get src/dst reg info */
for (ch = 0; ch < 4; ch++) {
coord_regs[ch] = get_src_reg(gen, ch, &inst->Src[0]);
d_regs[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
}
{
ubyte usedRegs[SPE_NUM_REGS];
uint i, numUsed;
numUsed = spe_get_registers_used(gen->f, usedRegs);
assert(numUsed < gen->frame_size / 16 - 2);
/* save registers to stack */
for (i = 0; i < numUsed; i++) {
uint reg = usedRegs[i];
int offset = 2 + i;
spe_stqd(gen->f, reg, SPE_REG_SP, 16 * offset);
}
/* setup function arguments (XXX depends on target) */
for (i = 0; i < 4; i++) {
spe_move(gen->f, 3 + i, coord_regs[i]);
}
spe_load_uint(gen->f, 7, unit); /* sampler unit */
/* branch to function, save return addr */
spe_brasl(gen->f, SPE_REG_RA, addr);
/* save function's return values (four pixel's colors) */
for (i = 0; i < 4; i++) {
spe_move(gen->f, d_regs[i], 3 + i);
}
/* restore registers from stack */
for (i = 0; i < numUsed; i++) {
uint reg = usedRegs[i];
if (reg != d_regs[0] &&
reg != d_regs[1] &&
reg != d_regs[2] &&
reg != d_regs[3]) {
int offset = 2 + i;
spe_lqd(gen->f, reg, SPE_REG_SP, 16 * offset);
}
}
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_regs[ch], ch, &inst->Dst[0]);
free_itemps(gen);
}
return TRUE;
}
/**
* KILL if any of src reg values are less than zero.
*/
static boolean
emit_KIL(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch;
int s_regs[4], kil_reg = -1, cmp_reg, zero_reg;
spe_comment(gen->f, -4, "CALL kil:");
/* zero = {0,0,0,0} */
zero_reg = get_itemp(gen);
spe_zero(gen->f, zero_reg);
cmp_reg = get_itemp(gen);
/* get src regs */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s_regs[ch] = get_src_reg(gen, ch, &inst->Src[0]);
}
/* test if any src regs are < 0 */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
if (kil_reg >= 0) {
/* cmp = 0 > src ? : ~0 : 0 */
spe_fcgt(gen->f, cmp_reg, zero_reg, s_regs[ch]);
/* kil = kil | cmp */
spe_or(gen->f, kil_reg, kil_reg, cmp_reg);
}
else {
kil_reg = get_itemp(gen);
/* kil = 0 > src ? : ~0 : 0 */
spe_fcgt(gen->f, kil_reg, zero_reg, s_regs[ch]);
}
}
if (gen->if_nesting || gen->loop_nesting) {
/* may have been a conditional kil */
spe_and(gen->f, kil_reg, kil_reg, gen->exec_mask_reg);
}
/* allocate the kill mask reg if needed */
if (gen->kill_mask_reg <= 0) {
gen->kill_mask_reg = spe_allocate_available_register(gen->f);
spe_move(gen->f, gen->kill_mask_reg, kil_reg);
}
else {
spe_or(gen->f, gen->kill_mask_reg, gen->kill_mask_reg, kil_reg);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit min or max.
*/
static boolean
emit_MIN_MAX(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch, s0_reg[4], s1_reg[4], d_reg[4], tmp_reg[4];
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
s0_reg[ch] = get_src_reg(gen, ch, &inst->Src[0]);
s1_reg[ch] = get_src_reg(gen, ch, &inst->Src[1]);
d_reg[ch] = get_dst_reg(gen, ch, &inst->Dst[0]);
tmp_reg[ch] = get_itemp(gen);
}
/* d = (s0 > s1) ? s0 : s1 */
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
if (inst->Instruction.Opcode == TGSI_OPCODE_MAX)
spe_fcgt(gen->f, tmp_reg[ch], s0_reg[ch], s1_reg[ch]);
else
spe_fcgt(gen->f, tmp_reg[ch], s1_reg[ch], s0_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
spe_selb(gen->f, d_reg[ch], s1_reg[ch], s0_reg[ch], tmp_reg[ch]);
}
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
store_dest_reg(gen, d_reg[ch], ch, &inst->Dst[0]);
}
free_itemps(gen);
return TRUE;
}
/**
* Emit code to update the execution mask.
* This needs to be done whenever the execution status of a conditional
* or loop is changed.
*/
static void
emit_update_exec_mask(struct codegen *gen)
{
const int exec_reg = get_exec_mask_reg(gen);
const int cond_reg = gen->cond_mask_reg;
const int loop_reg = gen->loop_mask_reg;
spe_comment(gen->f, 0, "Update master execution mask");
if (gen->if_nesting > 0 && gen->loop_nesting > 0) {
/* exec_mask = cond_mask & loop_mask */
assert(cond_reg > 0);
assert(loop_reg > 0);
spe_and(gen->f, exec_reg, cond_reg, loop_reg);
}
else if (gen->if_nesting > 0) {
assert(cond_reg > 0);
spe_move(gen->f, exec_reg, cond_reg);
}
else if (gen->loop_nesting > 0) {
assert(loop_reg > 0);
spe_move(gen->f, exec_reg, loop_reg);
}
else {
spe_load_int(gen->f, exec_reg, ~0x0);
}
}
static boolean
emit_IF(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
const int channel = 0;
int cond_reg;
cond_reg = get_cond_mask_reg(gen);
/* XXX push cond exec mask */
spe_comment(gen->f, 0, "init conditional exec mask = ~0:");
spe_load_int(gen->f, cond_reg, ~0);
/* update conditional execution mask with the predicate register */
int tmp_reg = get_itemp(gen);
int s1_reg = get_src_reg(gen, channel, &inst->Src[0]);
/* tmp = (s1_reg == 0) */
spe_ceqi(gen->f, tmp_reg, s1_reg, 0);
/* tmp = !tmp */
spe_complement(gen->f, tmp_reg, tmp_reg);
/* cond_mask = cond_mask & tmp */
spe_and(gen->f, cond_reg, cond_reg, tmp_reg);
gen->if_nesting++;
/* update the master execution mask */
emit_update_exec_mask(gen);
free_itemps(gen);
return TRUE;
}
static boolean
emit_ELSE(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
const int cond_reg = get_cond_mask_reg(gen);
spe_comment(gen->f, 0, "cond exec mask = !cond exec mask");
spe_complement(gen->f, cond_reg, cond_reg);
emit_update_exec_mask(gen);
return TRUE;
}
static boolean
emit_ENDIF(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
/* XXX todo: pop cond exec mask */
gen->if_nesting--;
emit_update_exec_mask(gen);
return TRUE;
}
static boolean
emit_BGNLOOP(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int exec_reg, loop_reg;
exec_reg = get_exec_mask_reg(gen);
loop_reg = get_loop_mask_reg(gen);
/* XXX push loop_exec mask */
spe_comment(gen->f, 0*-4, "initialize loop exec mask = ~0");
spe_load_int(gen->f, loop_reg, ~0x0);
gen->loop_nesting++;
gen->loop_start = spe_code_size(gen->f); /* in bytes */
return TRUE;
}
static boolean
emit_ENDLOOP(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
const int loop_reg = get_loop_mask_reg(gen);
const int tmp_reg = get_itemp(gen);
int offset;
/* tmp_reg = exec[0] | exec[1] | exec[2] | exec[3] */
spe_orx(gen->f, tmp_reg, loop_reg);
offset = gen->loop_start - spe_code_size(gen->f); /* in bytes */
/* branch back to top of loop if tmp_reg != 0 */
spe_brnz(gen->f, tmp_reg, offset / 4);
/* XXX pop loop_exec mask */
gen->loop_nesting--;
emit_update_exec_mask(gen);
return TRUE;
}
static boolean
emit_BRK(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
const int exec_reg = get_exec_mask_reg(gen);
const int loop_reg = get_loop_mask_reg(gen);
assert(gen->loop_nesting > 0);
spe_comment(gen->f, 0, "loop exec mask &= ~master exec mask");
spe_andc(gen->f, loop_reg, loop_reg, exec_reg);
emit_update_exec_mask(gen);
return TRUE;
}
static boolean
emit_CONT(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
assert(gen->loop_nesting > 0);
return TRUE;
}
static boolean
emit_DDX_DDY(struct codegen *gen, const struct tgsi_full_instruction *inst,
boolean ddx)
{
int ch;
FOR_EACH_ENABLED_CHANNEL(inst, ch) {
int s_reg = get_src_reg(gen, ch, &inst->Src[0]);
int d_reg = get_dst_reg(gen, ch, &inst->Dst[0]);
int t1_reg = get_itemp(gen);
int t2_reg = get_itemp(gen);
spe_splat_word(gen->f, t1_reg, s_reg, 0); /* upper-left pixel */
if (ddx) {
spe_splat_word(gen->f, t2_reg, s_reg, 1); /* upper-right pixel */
}
else {
spe_splat_word(gen->f, t2_reg, s_reg, 2); /* lower-left pixel */
}
spe_fs(gen->f, d_reg, t2_reg, t1_reg);
free_itemps(gen);
}
return TRUE;
}
/**
* Emit END instruction.
* We just return from the shader function at this point.
*
* Note that there may be more code after this that would be
* called by TGSI_OPCODE_CALL.
*/
static boolean
emit_END(struct codegen *gen)
{
emit_epilogue(gen);
return TRUE;
}
/**
* Emit code for the given instruction. Just a big switch stmt.
*/
static boolean
emit_instruction(struct codegen *gen,
const struct tgsi_full_instruction *inst)
{
switch (inst->Instruction.Opcode) {
case TGSI_OPCODE_ARL:
return emit_ARL(gen, inst);
case TGSI_OPCODE_MOV:
return emit_MOV(gen, inst);
case TGSI_OPCODE_ADD:
case TGSI_OPCODE_SUB:
case TGSI_OPCODE_MUL:
return emit_binop(gen, inst);
case TGSI_OPCODE_MAD:
return emit_MAD(gen, inst);
case TGSI_OPCODE_LRP:
return emit_LRP(gen, inst);
case TGSI_OPCODE_DP3:
return emit_DP3(gen, inst);
case TGSI_OPCODE_DP4:
return emit_DP4(gen, inst);
case TGSI_OPCODE_DPH:
return emit_DPH(gen, inst);
case TGSI_OPCODE_NRM:
return emit_NRM3(gen, inst);
case TGSI_OPCODE_XPD:
return emit_XPD(gen, inst);
case TGSI_OPCODE_RCP:
case TGSI_OPCODE_RSQ:
return emit_RCP_RSQ(gen, inst);
case TGSI_OPCODE_ABS:
return emit_ABS(gen, inst);
case TGSI_OPCODE_SGT:
case TGSI_OPCODE_SLT:
case TGSI_OPCODE_SGE:
case TGSI_OPCODE_SLE:
case TGSI_OPCODE_SEQ:
case TGSI_OPCODE_SNE:
return emit_inequality(gen, inst);
case TGSI_OPCODE_CMP:
return emit_CMP(gen, inst);
case TGSI_OPCODE_MIN:
case TGSI_OPCODE_MAX:
return emit_MIN_MAX(gen, inst);
case TGSI_OPCODE_TRUNC:
return emit_TRUNC(gen, inst);
case TGSI_OPCODE_FLR:
return emit_FLR(gen, inst);
case TGSI_OPCODE_FRC:
return emit_FRC(gen, inst);
case TGSI_OPCODE_END:
return emit_END(gen);
case TGSI_OPCODE_COS:
return emit_function_call(gen, inst, "spu_cos", 1, TRUE);
case TGSI_OPCODE_SIN:
return emit_function_call(gen, inst, "spu_sin", 1, TRUE);
case TGSI_OPCODE_POW:
return emit_function_call(gen, inst, "spu_pow", 2, TRUE);
case TGSI_OPCODE_EX2:
return emit_function_call(gen, inst, "spu_exp2", 1, TRUE);
case TGSI_OPCODE_LG2:
return emit_function_call(gen, inst, "spu_log2", 1, TRUE);
case TGSI_OPCODE_TEX:
/* fall-through for now */
case TGSI_OPCODE_TXD:
/* fall-through for now */
case TGSI_OPCODE_TXB:
/* fall-through for now */
case TGSI_OPCODE_TXL:
/* fall-through for now */
case TGSI_OPCODE_TXP:
return emit_TEX(gen, inst);
case TGSI_OPCODE_KIL:
return emit_KIL(gen, inst);
case TGSI_OPCODE_IF:
return emit_IF(gen, inst);
case TGSI_OPCODE_ELSE:
return emit_ELSE(gen, inst);
case TGSI_OPCODE_ENDIF:
return emit_ENDIF(gen, inst);
case TGSI_OPCODE_BGNLOOP:
return emit_BGNLOOP(gen, inst);
case TGSI_OPCODE_ENDLOOP:
return emit_ENDLOOP(gen, inst);
case TGSI_OPCODE_BRK:
return emit_BRK(gen, inst);
case TGSI_OPCODE_CONT:
return emit_CONT(gen, inst);
case TGSI_OPCODE_DDX:
return emit_DDX_DDY(gen, inst, TRUE);
case TGSI_OPCODE_DDY:
return emit_DDX_DDY(gen, inst, FALSE);
/* XXX lots more cases to do... */
default:
fprintf(stderr, "Cell: unimplemented TGSI instruction %d!\n",
inst->Instruction.Opcode);
return FALSE;
}
return TRUE;
}
/**
* Emit code for a TGSI immediate value (vector of four floats).
* This involves register allocation and initialization.
* XXX the initialization should be done by a "prepare" stage, not
* per quad execution!
*/
static boolean
emit_immediate(struct codegen *gen, const struct tgsi_full_immediate *immed)
{
int ch;
assert(gen->num_imm < MAX_TEMPS);
for (ch = 0; ch < 4; ch++) {
float val = immed->u[ch].Float;
if (ch > 0 && val == immed->u[ch - 1].Float) {
/* re-use previous register */
gen->imm_regs[gen->num_imm][ch] = gen->imm_regs[gen->num_imm][ch - 1];
}
else {
char str[100];
int reg = spe_allocate_available_register(gen->f);
if (reg < 0)
return FALSE;
sprintf(str, "init $%d = %f", reg, val);
spe_comment(gen->f, 0, str);
/* update immediate map */
gen->imm_regs[gen->num_imm][ch] = reg;
/* emit initializer instruction */
spe_load_float(gen->f, reg, val);
}
}
gen->num_imm++;
return TRUE;
}
/**
* Emit "code" for a TGSI declaration.
* We only care about TGSI TEMPORARY register declarations at this time.
* For each TGSI TEMPORARY we allocate four SPE registers.
*/
static boolean
emit_declaration(struct cell_context *cell,
struct codegen *gen, const struct tgsi_full_declaration *decl)
{
int i, ch;
switch (decl->Declaration.File) {
case TGSI_FILE_TEMPORARY:
for (i = decl->Range.First;
i <= decl->Range.Last;
i++) {
assert(i < MAX_TEMPS);
for (ch = 0; ch < 4; ch++) {
gen->temp_regs[i][ch] = spe_allocate_available_register(gen->f);
if (gen->temp_regs[i][ch] < 0)
return FALSE; /* out of regs */
}
/* XXX if we run out of SPE registers, we need to spill
* to SPU memory. someday...
*/
{
char buf[100];
sprintf(buf, "TGSI temp[%d] maps to SPU regs [$%d $%d $%d $%d]", i,
gen->temp_regs[i][0], gen->temp_regs[i][1],
gen->temp_regs[i][2], gen->temp_regs[i][3]);
spe_comment(gen->f, 0, buf);
}
}
break;
default:
; /* ignore */
}
return TRUE;
}
/**
* Translate TGSI shader code to SPE instructions. This is done when
* the state tracker gives us a new shader (via pipe->create_fs_state()).
*
* \param cell the rendering context (in)
* \param tokens the TGSI shader (in)
* \param f the generated function (out)
*/
boolean
cell_gen_fragment_program(struct cell_context *cell,
const struct tgsi_token *tokens,
struct spe_function *f)
{
struct tgsi_parse_context parse;
struct codegen gen;
uint ic = 0;
memset(&gen, 0, sizeof(gen));
gen.cell = cell;
gen.f = f;
/* For SPE function calls: reg $3 = first param, $4 = second param, etc. */
gen.inputs_reg = 3; /* pointer to inputs array */
gen.outputs_reg = 4; /* pointer to outputs array */
gen.constants_reg = 5; /* pointer to constants array */
spe_init_func(f, SPU_MAX_FRAGMENT_PROGRAM_INSTS * SPE_INST_SIZE);
spe_allocate_register(f, gen.inputs_reg);
spe_allocate_register(f, gen.outputs_reg);
spe_allocate_register(f, gen.constants_reg);
if (cell->debug_flags & CELL_DEBUG_ASM) {
spe_print_code(f, TRUE);
spe_indent(f, 2*8);
printf("Begin %s\n", __FUNCTION__);
tgsi_dump(tokens, 0);
}
tgsi_parse_init(&parse, tokens);
emit_prologue(&gen);
while (!tgsi_parse_end_of_tokens(&parse) && !gen.error) {
tgsi_parse_token(&parse);
switch (parse.FullToken.Token.Type) {
case TGSI_TOKEN_TYPE_IMMEDIATE:
if (f->print) {
_debug_printf(" # ");
tgsi_dump_immediate(&parse.FullToken.FullImmediate);
}
if (!emit_immediate(&gen, &parse.FullToken.FullImmediate))
gen.error = TRUE;
break;
case TGSI_TOKEN_TYPE_DECLARATION:
if (f->print) {
_debug_printf(" # ");
tgsi_dump_declaration(&parse.FullToken.FullDeclaration);
}
if (!emit_declaration(cell, &gen, &parse.FullToken.FullDeclaration))
gen.error = TRUE;
break;
case TGSI_TOKEN_TYPE_INSTRUCTION:
if (f->print) {
_debug_printf(" # ");
ic++;
tgsi_dump_instruction(&parse.FullToken.FullInstruction, ic);
}
if (!emit_instruction(&gen, &parse.FullToken.FullInstruction))
gen.error = TRUE;
break;
default:
assert(0);
}
}
if (gen.error) {
/* terminate the SPE code */
return emit_END(&gen);
}
if (cell->debug_flags & CELL_DEBUG_ASM) {
printf("cell_gen_fragment_program nr instructions: %d\n", f->num_inst);
printf("End %s\n", __FUNCTION__);
}
tgsi_parse_free( &parse );
return !gen.error;
}