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tcg: Optimize movcond for constant comparisons

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Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2012-09-21 10:13:37 -07:00 committed by Aurelien Jarno
parent d0a16297c9
commit fa01a2084e
1 changed files with 40 additions and 0 deletions
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40
tcg/optimize.c
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@ -394,6 +394,14 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
args[3] = tcg_swap_cond(args[3]);
}
break;
CASE_OP_32_64(movcond):
if (temps[args[1]].state == TCG_TEMP_CONST
&& temps[args[2]].state != TCG_TEMP_CONST) {
tmp = args[1];
args[1] = args[2];
args[2] = tmp;
args[5] = tcg_swap_cond(args[5]);
}
default:
break;
}
@ -614,6 +622,38 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
}
args += 4;
break;
CASE_OP_32_64(movcond):
if (temps[args[1]].state == TCG_TEMP_CONST
&& temps[args[2]].state == TCG_TEMP_CONST) {
tmp = do_constant_folding_cond(op, temps[args[1]].val,
temps[args[2]].val, args[5]);
if (args[0] == args[4-tmp]
|| (temps[args[4-tmp]].state == TCG_TEMP_COPY
&& temps[args[4-tmp]].val == args[0])) {
gen_opc_buf[op_index] = INDEX_op_nop;
} else if (temps[args[4-tmp]].state == TCG_TEMP_CONST) {
gen_opc_buf[op_index] = op_to_movi(op);
tcg_opt_gen_movi(gen_args, args[0], temps[args[4-tmp]].val,
nb_temps, nb_globals);
gen_args += 2;
} else {
gen_opc_buf[op_index] = op_to_mov(op);
tcg_opt_gen_mov(gen_args, args[0], args[4-tmp],
nb_temps, nb_globals);
gen_args += 2;
}
} 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];
gen_args[5] = args[5];
gen_args += 6;
}
args += 6;
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))) {