static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
TCGArg *args, TCGOpDef *tcg_op_defs)
{
- int i, nb_ops, op_index, nb_temps, nb_globals, nb_call_args;
- tcg_target_ulong mask, affected;
- TCGOpcode op;
- const TCGOpDef *def;
+ int nb_ops, op_index, nb_temps, nb_globals;
TCGArg *gen_args;
- TCGArg tmp;
/* Array VALS has an element for each temp.
If this temp holds a constant then its value is kept in VALS' element.
nb_ops = tcg_opc_ptr - s->gen_opc_buf;
gen_args = args;
for (op_index = 0; op_index < nb_ops; op_index++) {
- op = s->gen_opc_buf[op_index];
- def = &tcg_op_defs[op];
- /* Do copy propagation */
+ TCGOpcode op = s->gen_opc_buf[op_index];
+ const TCGOpDef *def = &tcg_op_defs[op];
+ tcg_target_ulong mask, affected;
+ int nb_oargs, nb_iargs, nb_args, i;
+ TCGArg tmp;
+
if (op == INDEX_op_call) {
- int nb_oargs = args[0] >> 16;
- int nb_iargs = args[0] & 0xffff;
- for (i = nb_oargs + 1; i < nb_oargs + nb_iargs + 1; i++) {
- if (temps[args[i]].state == TCG_TEMP_COPY) {
- args[i] = find_better_copy(s, args[i]);
- }
- }
+ *gen_args++ = tmp = *args++;
+ nb_oargs = tmp >> 16;
+ nb_iargs = tmp & 0xffff;
+ nb_args = nb_oargs + nb_iargs + def->nb_cargs;
} else {
- for (i = def->nb_oargs; i < def->nb_oargs + def->nb_iargs; i++) {
- if (temps[args[i]].state == TCG_TEMP_COPY) {
- args[i] = find_better_copy(s, args[i]);
- }
+ nb_oargs = def->nb_oargs;
+ nb_iargs = def->nb_iargs;
+ nb_args = def->nb_args;
+ }
+
+ /* Do copy propagation */
+ for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
+ if (temps[args[i]].state == TCG_TEMP_COPY) {
+ args[i] = find_better_copy(s, args[i]);
}
}
break;
CASE_OP_32_64(setcond):
+ case INDEX_op_setcond2_i32:
mask = 1;
break;
CASE_OP_32_64(qemu_ld):
{
- TCGMemOp mop = args[def->nb_oargs + def->nb_iargs];
+ TCGMemOp mop = args[nb_oargs + nb_iargs];
if (!(mop & MO_SIGN)) {
mask = (2ULL << ((8 << (mop & MO_SIZE)) - 1)) - 1;
}
}
if (mask == 0) {
- assert(def->nb_oargs == 1);
+ assert(nb_oargs == 1);
s->gen_opc_buf[op_index] = op_to_movi(op);
tcg_opt_gen_movi(gen_args, args[0], 0);
- args += def->nb_oargs + def->nb_iargs + def->nb_cargs;
+ args += nb_args;
gen_args += 2;
continue;
}
if (affected == 0) {
- assert(def->nb_oargs == 1);
+ assert(nb_oargs == 1);
if (temps_are_copies(args[0], args[1])) {
s->gen_opc_buf[op_index] = INDEX_op_nop;
} else if (temps[args[1]].state != TCG_TEMP_CONST) {
tcg_opt_gen_movi(gen_args, args[0], temps[args[1]].val);
gen_args += 2;
}
- args += def->nb_iargs + 1;
+ args += nb_args;
continue;
}
tmp = do_constant_folding_cond2(&args[0], &args[2], args[4]);
if (tmp != 2) {
if (tmp) {
+ do_brcond_true:
reset_all_temps(nb_temps);
s->gen_opc_buf[op_index] = INDEX_op_br;
gen_args[0] = args[5];
gen_args += 1;
} else {
+ do_brcond_false:
s->gen_opc_buf[op_index] = INDEX_op_nop;
}
} else if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE)
&& temps[args[3]].val == 0) {
/* Simplify LT/GE comparisons vs zero to a single compare
vs the high word of the input. */
+ do_brcond_high:
reset_all_temps(nb_temps);
s->gen_opc_buf[op_index] = INDEX_op_brcond_i32;
gen_args[0] = args[1];
gen_args[2] = args[4];
gen_args[3] = args[5];
gen_args += 4;
+ } else if (args[4] == TCG_COND_EQ) {
+ /* Simplify EQ comparisons where one of the pairs
+ can be simplified. */
+ tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
+ args[0], args[2], TCG_COND_EQ);
+ if (tmp == 0) {
+ goto do_brcond_false;
+ } else if (tmp == 1) {
+ goto do_brcond_high;
+ }
+ tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
+ args[1], args[3], TCG_COND_EQ);
+ if (tmp == 0) {
+ goto do_brcond_false;
+ } else if (tmp != 1) {
+ goto do_default;
+ }
+ do_brcond_low:
+ reset_all_temps(nb_temps);
+ s->gen_opc_buf[op_index] = INDEX_op_brcond_i32;
+ gen_args[0] = args[0];
+ gen_args[1] = args[2];
+ gen_args[2] = args[4];
+ gen_args[3] = args[5];
+ gen_args += 4;
+ } else if (args[4] == TCG_COND_NE) {
+ /* Simplify NE comparisons where one of the pairs
+ can be simplified. */
+ tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
+ args[0], args[2], TCG_COND_NE);
+ if (tmp == 0) {
+ goto do_brcond_high;
+ } else if (tmp == 1) {
+ goto do_brcond_true;
+ }
+ tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
+ args[1], args[3], TCG_COND_NE);
+ if (tmp == 0) {
+ goto do_brcond_low;
+ } else if (tmp == 1) {
+ goto do_brcond_true;
+ }
+ goto do_default;
} else {
goto do_default;
}
case INDEX_op_setcond2_i32:
tmp = do_constant_folding_cond2(&args[1], &args[3], args[5]);
if (tmp != 2) {
+ do_setcond_const:
s->gen_opc_buf[op_index] = INDEX_op_movi_i32;
tcg_opt_gen_movi(gen_args, args[0], tmp);
gen_args += 2;
&& temps[args[4]].val == 0) {
/* Simplify LT/GE comparisons vs zero to a single compare
vs the high word of the input. */
+ do_setcond_high:
s->gen_opc_buf[op_index] = INDEX_op_setcond_i32;
reset_temp(args[0]);
+ temps[args[0]].mask = 1;
gen_args[0] = args[0];
gen_args[1] = args[2];
gen_args[2] = args[4];
gen_args[3] = args[5];
gen_args += 4;
+ } else if (args[5] == TCG_COND_EQ) {
+ /* Simplify EQ comparisons where one of the pairs
+ can be simplified. */
+ tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
+ args[1], args[3], TCG_COND_EQ);
+ if (tmp == 0) {
+ goto do_setcond_const;
+ } else if (tmp == 1) {
+ goto do_setcond_high;
+ }
+ tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
+ args[2], args[4], TCG_COND_EQ);
+ if (tmp == 0) {
+ goto do_setcond_high;
+ } else if (tmp != 1) {
+ goto do_default;
+ }
+ do_setcond_low:
+ reset_temp(args[0]);
+ temps[args[0]].mask = 1;
+ s->gen_opc_buf[op_index] = INDEX_op_setcond_i32;
+ gen_args[0] = args[0];
+ gen_args[1] = args[1];
+ gen_args[2] = args[3];
+ gen_args[3] = args[5];
+ gen_args += 4;
+ } else if (args[5] == TCG_COND_NE) {
+ /* Simplify NE comparisons where one of the pairs
+ can be simplified. */
+ tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
+ args[1], args[3], TCG_COND_NE);
+ if (tmp == 0) {
+ goto do_setcond_high;
+ } else if (tmp == 1) {
+ goto do_setcond_const;
+ }
+ tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
+ args[2], args[4], TCG_COND_NE);
+ if (tmp == 0) {
+ goto do_setcond_low;
+ } else if (tmp == 1) {
+ goto do_setcond_const;
+ }
+ goto do_default;
} else {
goto do_default;
}
break;
case INDEX_op_call:
- nb_call_args = (args[0] >> 16) + (args[0] & 0xffff);
- if (!(args[nb_call_args + 1] & (TCG_CALL_NO_READ_GLOBALS |
- TCG_CALL_NO_WRITE_GLOBALS))) {
+ if (!(args[nb_oargs + nb_iargs + 1]
+ & (TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_WRITE_GLOBALS))) {
for (i = 0; i < nb_globals; i++) {
reset_temp(i);
}
}
- for (i = 0; i < (args[0] >> 16); i++) {
- reset_temp(args[i + 1]);
- }
- i = nb_call_args + 3;
- while (i) {
- *gen_args = *args;
- args++;
- gen_args++;
- i--;
- }
- break;
+ goto do_reset_output;
default:
do_default:
if (def->flags & TCG_OPF_BB_END) {
reset_all_temps(nb_temps);
} else {
- for (i = 0; i < def->nb_oargs; i++) {
+ do_reset_output:
+ for (i = 0; i < nb_oargs; i++) {
reset_temp(args[i]);
/* Save the corresponding known-zero bits mask for the
first output argument (only one supported so far). */
}
}
}
- for (i = 0; i < def->nb_args; i++) {
+ for (i = 0; i < nb_args; i++) {
gen_args[i] = args[i];
}
- args += def->nb_args;
- gen_args += def->nb_args;
+ args += nb_args;
+ gen_args += nb_args;
break;
}
}
projects / qemu.git / blobdiff