Big endian is currently not supported for arm_sve.h
时间: 2024-06-06 20:11:27 浏览: 111
As an AI language model, I cannot accurately confirm the current status of support for big endian in arm_sve.h. However, it is recommended to consult the official documentation or forums to confirm the current status of support for big endian in arm_sve.h.
相关问题
你给的代码报错form_para.cpp:340:14: No matching function for call to 'swap' move.h:182:5: candidate function [with _Tp = QByteRef] not viable: expects an lvalue for 1st argument stl_bvector.h:114:3: candidate function not viable: no known conversion from 'QByteRef' to 'std::_Bit_reference' for 1st argument stl_bvector.h:122:3: candidate function not viable: no known conversion from 'QByteRef' to 'std::_Bit_reference' for 1st argument stl_bvector.h:130:3: candidate function not viable: no known conversion from 'QByteRef' to 'bool &' for 1st argument move.h:205:5: candidate template ignored: could not match '_Tp[_Nm]' against 'QByteRef' stl_pair.h:490:5: candidate template ignored: could not match 'pair<_T1, _T2>' against 'QByteRef' stl_pair.h:498:5: candidate template ignored: could not match 'pair<_T1, _T2>' against 'QByteRef' ... shared_ptr_base.h:1738:5: candidate template ignored: could not match '__weak_ptr<_Tp, _Lp>' against 'QByteRef' shared_ptr.h:490:5: candidate template ignored: could not match 'shared_ptr<_Tp>' against 'QByteRef' shared_ptr.h:611:5: candidate template ignored: could not match 'weak_ptr<_Tp>' against 'QByteRef'
非常抱歉,我的代码还是有误。QByteArray的swap函数确实只接受一个参数。如果要交换两个字节的高低位,可以使用以下代码:
```cpp
uint16_t value = 0x1234; // 待转换的uint16_t值
QByteArray bytes(reinterpret_cast<const char*>(&value), sizeof(value)); // 将uint16_t转换成QByteArray
char temp = bytes[0];
bytes[0] = bytes[1];
bytes[1] = temp;
QString str(bytes); // 将QByteArray转换成QString
```
在上述代码中,我们使用一个临时变量temp来交换QByteArray中的两个字节的高低位。最终,输出的字符串为:"4321"。
请注意,上述代码假定机器采用的是little-endian格式,即低地址存放的是值的低位字节。如果机器采用的是big-endian格式,即低地址存放的是值的高位字节,则需要交换QByteArray中的第0个字节和第1个字节。
DataId DiagSH_GetTargetReadDID( void ) { uint16_t off_set = 0; DataId ret_did = 0; uint32_t tmpoff_set = 0; tmpoff_set = ( DiagSH_GetReuestReadDIDIdx() * 2 ); if(tmpoff_set < DIAG_CANMSG_DATA_SIZE_MAX){ off_set = (uint16_t)tmpoff_set; } else{ off_set = (uint16_t)(DIAG_CANMSG_DATA_SIZE_MAX - 1); } #ifndef DIAGSH_BIG_ENDIAN ret_did = (DataId)DiagSH_RequestBuffer.msg_info.body[off_set] << 8; ret_did |= (DataId)DiagSH_RequestBuffer.msg_info.body[(uint32_t)(off_set+1)]; #else /* DIAGSH_BIG_ENDIAN */ ret_did = (DataId)DiagSH_RequestBuffer.msg_info.body[off_set+1] << 8; ret_did |= (DataId)DiagSH_RequestBuffer.msg_info.body[off_set]; #endif /* DIAGSH_BIG_ENDIAN */ return ret_did; }
这段代码是一个函数DiagSH_GetTargetReadDID,返回类型为DataId。该函数的目的是获取一个目标读取DID(Diagnostic Identifier)。
首先,定义了一个uint16_t类型的变量off_set,并初始化为0。接着,定义了一个DataId类型的变量ret_did,并初始化为0。同时,定义了一个uint32_t类型的变量tmpoff_set,并初始化为0。
接下来,将DiagSH_GetReuestReadDIDIdx()的返回值乘以2,并将结果赋给tmpoff_set。然后,通过比较tmpoff_set和DIAG_CANMSG_DATA_SIZE_MAX的大小,来确定off_set的值。如果tmpoff_set小于DIAG_CANMSG_DATA_SIZE_MAX,则将tmpoff_set强制转换为uint16_t类型,并赋给off_set;否则,将DIAG_CANMSG_DATA_SIZE_MAX减去1,并强制转换为uint16_t类型,赋给off_set。
接下来是一段条件编译的代码块。如果未定义DIAGSH_BIG_ENDIAN宏,则执行下面的代码块。在这个代码块中,ret_did的值由两个字节组成,第一个字节是DiagSH_RequestBuffer.msg_info.body[off_set]左移8位后的结果,第二个字节是DiagSH_RequestBuffer.msg_info.body[off_set+1]的值。
如果定义了DIAGSH_BIG_ENDIAN宏,则执行下面的代码块。在这个代码块中,ret_did的值由两个字节组成,第一个字节是DiagSH_RequestBuffer.msg_info.body[off_set+1]左移8位后的结果,第二个字节是DiagSH_RequestBuffer.msg_info.body[off_set]的值。
最后,返回ret_did的值。
总的来说,这段代码的作用是根据一定规则从DiagSH_RequestBuffer中读取数据,并将其转换为DataId类型后返回。具体的逻辑与字节序的处理有关。