fpcvt.fx 操作 字型慣例
if (PR[qp]) {
fp_check_target_register;
if (tmp_isrcode = fp_reg_disabled(f1, f2, 0, 0))
disabled_fp_register_fault(tmp_isrcode, 0);

if (fp_is_natval([f2])) {
FR[f1] = NATVAL;
fp_update_psr(f1);
} else {
tmp_default_result_pair = fpcvt_exception_fault_check(f2, sf,
signed_form, trunc_form, &tmp_fp_env);
if (fp_raise_fault(tmp_fp_env))
fp_exception_fault(fp_decode_fault(tmp_fp_env));

if (fp_is_nan(tmp_default_result_pair.hi)) {
tmp_res_hi = INTEGER_INDEFINITE_32_BIT;
} else {
tmp_res = fp_ieee_rnd_to_int_sp(fp_reg_read_hi(f2), HIGH, &tmp_fp_env);
if (tmp_res.exponent)
tmp_res.significand = fp_U64_rsh(
tmp_res.significand, (FP_INTEGER_EXP - tmp_res.exponent));
if (signed_form && tmp_res.sign)
tmp_res.significand = (~tmp_res.significand) + 1;

tmp_res_hi = tmp_res.significand{31:0};
}

if (fp_is_nan(tmp_default_result_pair.lo)) {
tmp_res_lo = INTEGER_INDEFINITE_32_BIT;
} else {
tmp_res = fp_ieee_rnd_to_int_sp(fp_reg_read_lo(f2), LOW, &tmp_fp_env);
if (tmp_res.exponent)
tmp_res.significand = fp_U64_rsh(
tmp_res.significand, (FP_INTEGER_EXP - tmp_res.exponent));
if (signed_form && tmp_res.sign)
tmp_res.significand = (~tmp_res.significand) + 1;

tmp_res_lo = tmp_res.significand{31:0};
}

FR[f1].significand = fp_concatenate(tmp_res_hi, tmp_res_lo);
FR[f1].exponent = FP_INTEGER_EXP;
FR[f1].sign = FP_SIGN_POSITIVE;

fp_update_fpsr(sf, tmp_fp_env);
fp_update_psr(f1);
if (fp_raise_traps(tmp_fp_env))
fp_exception_trap(fp_decode_trap(tmp_fp_env));
}
}