int num_itemps;
int itemps[3];
+ /** Current IF/ELSE/ENDIF nesting level */
+ int if_nesting;
+ /** Index of execution mask register */
+ int exec_mask_reg;
+
struct spe_function *f;
boolean error;
};
{
if (gen->one_reg <= 0) {
gen->one_reg = spe_allocate_available_register(gen->f);
- }
- /* one = {1.0, 1.0, 1.0, 1.0} */
- spe_load_float(gen->f, gen->one_reg, 1.0f);
+ /* one = {1.0, 1.0, 1.0, 1.0} */
+ spe_load_float(gen->f, gen->one_reg, 1.0f);
#if DISASSEM
- printf("il\tr%d, 1.0f\n", gen->one_reg);
+ printf("\til\tr%d, 1.0f\n", gen->one_reg);
#endif
+ }
return gen->one_reg;
}
+/**
+ * Return index of the pixel execution mask.
+ * The register is allocated an initialized upon the first call.
+ *
+ * The pixel 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);
+
+ /* exec_mask = {~0, ~0, ~0, ~0} */
+ spe_load_int(gen->f, gen->exec_mask_reg, ~0);
+#if DISASSEM
+ printf("INIT EXEC MASK:\n");
+ printf("\tload\tr%d, 0x%x\n", gen->exec_mask_reg, ~0);
+#endif
+ }
+
+ return gen->exec_mask_reg;
+}
+
+
/**
* Return the index of the SPU temporary containing the named TGSI
* source register. If the TGSI register is a TGSI_FILE_TEMPORARY we
int channel,
const struct tgsi_full_src_register *src)
{
- int reg;
+ int reg = -1;
int swizzle = tgsi_util_get_full_src_register_extswizzle(src, channel);
assert(swizzle >= 0);
/* Load: reg = memory[(machine_reg) + offset] */
spe_lqd(gen->f, reg, gen->inputs_reg, offset);
#if DISASSEM
- printf("lqd\tr%d, r%d + %d\n", reg, gen->inputs_reg, offset);
+ printf("\tlqd\tr%d, r%d + %d\n", reg, gen->inputs_reg, offset);
#endif
}
break;
int channel,
const struct tgsi_full_dst_register *dest)
{
- int reg;
+ int reg = -1;
switch (dest->DstRegister.File) {
case TGSI_FILE_TEMPORARY:
- reg = gen->temp_regs[dest->DstRegister.Index][channel];
+ if (gen->if_nesting > 0)
+ reg = get_itemp(gen);
+ else
+ reg = gen->temp_regs[dest->DstRegister.Index][channel];
break;
case TGSI_FILE_OUTPUT:
reg = get_itemp(gen);
{
switch (dest->DstRegister.File) {
case TGSI_FILE_TEMPORARY:
- /* no-op */
+ if (gen->if_nesting > 0) {
+ int d_reg = gen->temp_regs[dest->DstRegister.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);
+#if DISASSEM
+ printf("\tselb\tr%d, r%d, r%d, r%d # EXEC MASK'ed\n",
+ d_reg, d_reg, value_reg, exec_reg);
+#endif
+ }
+ 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->DstRegister.Index * 4 + channel;
- /* Store: memory[(machine_reg) + offset] = reg */
- spe_stqd(gen->f, value_reg, gen->outputs_reg, offset);
+ if (gen->if_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);
+ /* 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);
#if DISASSEM
- printf("stqd\tr%d, r%d + %d\n", value_reg, gen->outputs_reg, offset);
+ printf("\tlqd\tr%d, r%d + %d\n",
+ curval_reg, gen->outputs_reg, offset);
+ printf("\tselb\tr%d, r%d, r%d, r%d # EXEC MASK'ed\n",
+ curval_reg, curval_reg, value_reg, exec_reg);
+ printf("\tstqd\tr%d, r%d + %d\n",
+ curval_reg, gen->outputs_reg, offset);
#endif
+ }
+ else {
+ /* Store: memory[(machine_reg) + offset] = reg */
+ spe_stqd(gen->f, value_reg, gen->outputs_reg, offset);
+#if DISASSEM
+ printf("\tstqd\tr%d, r%d + %d\n",
+ value_reg, gen->outputs_reg, offset);
+#endif
+ }
}
break;
default:
emit_MOV(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch;
+#if DISASSEM
+ printf("MOV:\n");
+#endif
for (ch = 0; ch < 4; ch++) {
if (inst->FullDstRegisters[0].DstRegister.WriteMask & (1 << ch)) {
int src_reg = get_src_reg(gen, ch, &inst->FullSrcRegisters[0]);
/* XXX we don't always need to actually emit a mov instruction here */
spe_move(gen->f, dst_reg, src_reg);
#if DISASSEM
- printf("mov\tr%d, r%d\n", dst_reg, src_reg);
+ printf("\tmov\tr%d, r%d\n", dst_reg, src_reg);
#endif
store_dest_reg(gen, dst_reg, ch, &inst->FullDstRegisters[0]);
free_itemps(gen);
}
+
/**
* Emit addition instructions. Recall that a single TGSI_OPCODE_ADD
* becomes (up to) four SPU "fa" instructions because we're doing SOA
emit_ADD(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch;
+#if DISASSEM
+ printf("ADD:\n");
+#endif
/* Loop over Red/Green/Blue/Alpha channels */
for (ch = 0; ch < 4; ch++) {
/* If the dest R, G, B or A writemask is enabled... */
/* Emit actual SPE instruction: d = s1 + s2 */
spe_fa(gen->f, d_reg, s1_reg, s2_reg);
#if DISASSEM
- printf("fa\tr%d, r%d, r%d\n", d_reg, s1_reg, s2_reg);
+ printf("\tfa\tr%d, r%d, r%d\n", d_reg, s1_reg, s2_reg);
#endif
/* Store the result (a no-op for TGSI_FILE_TEMPORARY dests) */
emit_MUL(struct codegen *gen, const struct tgsi_full_instruction *inst)
{
int ch;
+#if DISASSEM
+ printf("MUL:\n");
+#endif
for (ch = 0; ch < 4; ch++) {
if (inst->FullDstRegisters[0].DstRegister.WriteMask & (1 << ch)) {
int s1_reg = get_src_reg(gen, ch, &inst->FullSrcRegisters[0]);
/* d = s1 * s2 */
spe_fm(gen->f, d_reg, s1_reg, s2_reg);
#if DISASSEM
- printf("fm\tr%d, r%d, r%d\n", d_reg, s1_reg, s2_reg);
+ printf("\tfm\tr%d, r%d, r%d\n", d_reg, s1_reg, s2_reg);
#endif
store_dest_reg(gen, d_reg, ch, &inst->FullDstRegisters[0]);
free_itemps(gen);
{
int ch;
+#if DISASSEM
+ printf("SGT:\n");
+#endif
for (ch = 0; ch < 4; ch++) {
if (inst->FullDstRegisters[0].DstRegister.WriteMask & (1 << ch)) {
int s1_reg = get_src_reg(gen, ch, &inst->FullSrcRegisters[0]);
/* d = (s1 > s2) */
spe_fcgt(gen->f, d_reg, s1_reg, s2_reg);
#if DISASSEM
- printf("fcgt\tr%d, r%d, r%d\n", d_reg, s1_reg, s2_reg);
+ printf("\tfcgt\tr%d, r%d, r%d\n", d_reg, s1_reg, s2_reg);
#endif
/* convert d from 0x0/0xffffffff to 0.0/1.0 */
/* d = d & one_reg */
spe_and(gen->f, d_reg, d_reg, get_const_one_reg(gen));
#if DISASSEM
- printf("and\tr%d, r%d, r%d\n", d_reg, d_reg, get_const_one_reg(gen));
+ printf("\tand\tr%d, r%d, r%d\n", d_reg, d_reg, get_const_one_reg(gen));
#endif
store_dest_reg(gen, d_reg, ch, &inst->FullDstRegisters[0]);
}
+static boolean
+emit_IF(struct codegen *gen, const struct tgsi_full_instruction *inst)
+{
+ const int channel = 0;
+ const int exec_reg = get_exec_mask_reg(gen);
+
+ /* update execution mask with the predicate register */
+ int tmp_reg = spe_allocate_available_register(gen->f);
+ int s1_reg = get_src_reg(gen, channel, &inst->FullSrcRegisters[0]);
+
+ /* tmp = (s1_reg == 0) */
+ spe_ceqi(gen->f, tmp_reg, s1_reg, 0);
+ /* tmp = !tmp */
+ spe_complement(gen->f, tmp_reg);
+ /* exec_mask = exec_mask & tmp */
+ spe_and(gen->f, exec_reg, exec_reg, tmp_reg);
+#if DISASSEM
+ printf("IF:\n");
+ printf("\tseqi\tr%d, r%d, 0;\n", tmp_reg, s1_reg);
+ printf("\tcomp\tr%d\n", tmp_reg);
+ printf("\tand\tr%d, r%d, r%d\n", exec_reg, exec_reg, tmp_reg);
+#endif
+
+ gen->if_nesting++;
+
+ spe_release_register(gen->f, tmp_reg);
+
+ return true;
+}
+
+
+static boolean
+emit_ELSE(struct codegen *gen, const struct tgsi_full_instruction *inst)
+{
+ const int exec_reg = get_exec_mask_reg(gen);
+
+ /* exec_mask = !exec_mask */
+ spe_complement(gen->f, exec_reg);
+#if DISASSEM
+ printf("ELSE:\n");
+ printf("\tcomp\tr%d;\n", exec_reg);
+#endif
+ return true;
+}
+
+
+static boolean
+emit_ENDIF(struct codegen *gen, const struct tgsi_full_instruction *inst)
+{
+ const int exec_reg = get_exec_mask_reg(gen);
+
+ /* XXX todo: pop execution mask */
+
+ spe_load_int(gen->f, exec_reg, ~0x0);
+#if DISASSEM
+ printf("ENDIF:\n");
+ printf("\tli\tr%d, ~0x0\n", exec_reg);
+#endif
+
+ gen->if_nesting--;
+ return true;
+}
+
+
+
/**
* Emit END instruction.
* We just return from the shader function at this point.
/* return from function call */
spe_bi(gen->f, SPE_REG_RA, 0, 0);
#if DISASSEM
- printf("bi\trRA\n");
+ printf("\tbi\trRA\n");
#endif
return true;
}
case TGSI_OPCODE_END:
return emit_END(gen);
+ 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);
+
/* XXX lots more cases to do... */
default:
projects / mesa.git / commitdiff