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tcg/optimize: add constant folding for setcond

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Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2012-09-06 16:47:14 +02:00
parent 65a7cce17d
commit f8dd19e5c7
1 changed files with 81 additions and 0 deletions
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81
tcg/optimize.c
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@ -267,6 +267,67 @@ static TCGArg do_constant_folding(TCGOpcode op, TCGArg x, TCGArg y)
return res;
}
static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x,
TCGArg y, TCGCond c)
{
switch (op_bits(op)) {
case 32:
switch (c) {
case TCG_COND_EQ:
return (uint32_t)x == (uint32_t)y;
case TCG_COND_NE:
return (uint32_t)x != (uint32_t)y;
case TCG_COND_LT:
return (int32_t)x < (int32_t)y;
case TCG_COND_GE:
return (int32_t)x >= (int32_t)y;
case TCG_COND_LE:
return (int32_t)x <= (int32_t)y;
case TCG_COND_GT:
return (int32_t)x > (int32_t)y;
case TCG_COND_LTU:
return (uint32_t)x < (uint32_t)y;
case TCG_COND_GEU:
return (uint32_t)x >= (uint32_t)y;
case TCG_COND_LEU:
return (uint32_t)x <= (uint32_t)y;
case TCG_COND_GTU:
return (uint32_t)x > (uint32_t)y;
}
break;
case 64:
switch (c) {
case TCG_COND_EQ:
return (uint64_t)x == (uint64_t)y;
case TCG_COND_NE:
return (uint64_t)x != (uint64_t)y;
case TCG_COND_LT:
return (int64_t)x < (int64_t)y;
case TCG_COND_GE:
return (int64_t)x >= (int64_t)y;
case TCG_COND_LE:
return (int64_t)x <= (int64_t)y;
case TCG_COND_GT:
return (int64_t)x > (int64_t)y;
case TCG_COND_LTU:
return (uint64_t)x < (uint64_t)y;
case TCG_COND_GEU:
return (uint64_t)x >= (uint64_t)y;
case TCG_COND_LEU:
return (uint64_t)x <= (uint64_t)y;
case TCG_COND_GTU:
return (uint64_t)x > (uint64_t)y;
}
break;
}
fprintf(stderr,
"Unrecognized bitness %d or condition %d in "
"do_constant_folding_cond.\n", op_bits(op), c);
tcg_abort();
}
/* Propagate constants and copies, fold constant expressions. */
static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
TCGArg *args, TCGOpDef *tcg_op_defs)
@ -522,6 +583,26 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
args += 3;
break;
}
CASE_OP_32_64(setcond):
if (temps[args[1]].state == TCG_TEMP_CONST
&& temps[args[2]].state == TCG_TEMP_CONST) {
gen_opc_buf[op_index] = op_to_movi(op);
tmp = do_constant_folding_cond(op, temps[args[1]].val,
temps[args[2]].val, args[3]);
tcg_opt_gen_movi(gen_args, args[0], tmp, nb_temps, nb_globals);
gen_args += 2;
args += 4;
break;
} else {
reset_temp(args[0], nb_temps, nb_globals);
gen_args[0] = args[0];
gen_args[1] = args[1];
gen_args[2] = args[2];
gen_args[3] = args[3];
gen_args += 4;
args += 4;
break;
}
case INDEX_op_call:
nb_call_args = (args[0] >> 16) + (args[0] & 0xffff);
if (!(args[nb_call_args + 1] & (TCG_CALL_CONST | TCG_CALL_PURE))) {