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Add shortcuts to SwapEndian_16() and SwapEndian_32() internal functions to improve optimization if called with constant inputs.

This commit is contained in:
Dean Camera 2011-08-16 05:00:45 +00:00
parent ef4cff29c3
commit 3478178127
5 changed files with 53 additions and 25 deletions
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47
Demos/Device/Incomplete/TestAndMeasurement/TestAndMeasurement.c
View File

@ -65,7 +65,13 @@ static bool IsTMCBulkOUTReset = false;
static uint8_t CurrentTransferTag = 0;
/** Length of last data transfer, for reporting to the host in case an in-progress transfer is aborted */
static uint32_t LastTransferLength = 0;
static uint16_t LastTransferLength = 0;
/** Buffer to hold the next message to sent to the TMC host */
static uint8_t NextResponseBuffer[64];
/** Indicates the length of the next response to send */
static uint8_t NextReponseLen;
/** Main program entry point. This routine contains the overall program flow, including initial
* setup of all components and the main program loop.
@ -318,6 +324,27 @@ void EVENT_USB_Device_ControlRequest(void)
}
}
void ProcessSentMessage(uint8_t* const Data, const uint8_t Length)
{
if (strncmp((char*)Data, "*IDN?", 5) == 0)
strcpy((char*)NextResponseBuffer, "LUFA TMC DEMO");
NextReponseLen = strlen((char*)NextResponseBuffer);
}
uint8_t GetNextMessage(uint8_t* const Data)
{
strcpy((char*)NextResponseBuffer, "LUFA TMC DEMO");
NextReponseLen = strlen((char*)NextResponseBuffer);
// ---
uint8_t DataLen = MIN(NextReponseLen, 64);
strlcpy((char*)Data, (char*)NextResponseBuffer, DataLen);
return DataLen;
}
/** Function to manage TMC data transmission and reception to and from the host. */
void TMC_Task(void)
{
@ -326,7 +353,7 @@ void TMC_Task(void)
return;
TMC_MessageHeader_t MessageHeader;
uint16_t BytesTransferred;
uint8_t MessagePayload[128];
/* Try to read in a TMC message from the interface, process if one is available */
if (ReadTMCHeader(&MessageHeader))
@ -337,34 +364,32 @@ void TMC_Task(void)
switch (MessageHeader.MessageID)
{
case TMC_MESSAGEID_DEV_DEP_MSG_OUT:
BytesTransferred = 0;
while (Endpoint_Discard_Stream(MessageHeader.TransferSize, &BytesTransferred) ==
LastTransferLength = 0;
while (Endpoint_Read_Stream_LE(MessagePayload, MIN(MessageHeader.TransferSize, sizeof(MessagePayload)), &LastTransferLength) ==
ENDPOINT_RWSTREAM_IncompleteTransfer)
{
if (IsTMCBulkOUTReset)
break;
}
LastTransferLength = BytesTransferred;
Endpoint_ClearOUT();
ProcessSentMessage(MessagePayload, LastTransferLength);
break;
case TMC_MESSAGEID_DEV_DEP_MSG_IN:
Endpoint_ClearOUT();
char MessageData[] = "TMC Class Test";
MessageHeader.TransferSize = strlen(MessageData);
MessageHeader.TransferSize = GetNextMessage(MessagePayload);
MessageHeader.MessageIDSpecific.DeviceOUT.LastMessageTransaction = true;
WriteTMCHeader(&MessageHeader);
BytesTransferred = 0;
while (Endpoint_Write_Stream_LE(MessageData, MessageHeader.TransferSize, &BytesTransferred) ==
LastTransferLength = 0;
while (Endpoint_Write_Stream_LE(MessagePayload, MessageHeader.TransferSize, &LastTransferLength) ==
ENDPOINT_RWSTREAM_IncompleteTransfer)
{
if (IsTMCBulkINReset)
break;
}
LastTransferLength = BytesTransferred;
Endpoint_ClearIN();
break;

14
Demos/Device/Incomplete/TestAndMeasurement/TestAndMeasurement.h
View File

@ -108,19 +108,15 @@
typedef struct
{
unsigned LastMessageTransaction : 1;
unsigned Reserved : 7;
uint8_t Reserved2[3];
uint8_t LastMessageTransaction;
uint8_t TermChar;
uint8_t Reserved[2];
} TMC_DevOUTMessageHeader_t;
typedef struct
{
unsigned TermCharEnabled : 1;
unsigned Reserved : 7;
uint8_t TermChar;
uint8_t Reserved2[2];
uint8_t LastMessageTransaction;
uint8_t Reserved[3];
} TMC_DevINMessageHeader_t;
typedef struct

10
LUFA/Common/CompilerSpecific.h
View File

@ -70,26 +70,26 @@
*
* \param[in, out] StructPtr Pointer to a structure which is to be forced into indirect access mode.
*/
#define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr))
#define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr))
/** Forces GCC to create a memory barrier, ensuring that memory accesses are not reordered past the barrier point.
* This can be used before ordering-critical operations, to ensure that the compiler does not re-order the resulting
* assembly output in an unexpected manner on sections of code that are ordering-specific.
*/
#define GCC_MEMORY_BARRIER() __asm__ __volatile__("" ::: "memory");
#define GCC_MEMORY_BARRIER() __asm__ __volatile__("" ::: "memory");
/** Evaluates to boolean true if the specified value can be determined at compile time to be a constant value
* when compiling under GCC.
*
* \param[in] x Value to check compile time constantness of.
*
* \return Boolean true if the given value is known to be a compile time constant.
* \return Boolean true if the given value is known to be a compile time constant, false otherwise.
*/
#define GCC_IS_COMPILE_CONST(x) __builtin_constant_p(x)
#define GCC_IS_COMPILE_CONST(x) __builtin_constant_p(x)
#else
#define GCC_FORCE_POINTER_ACCESS(StructPtr)
#define GCC_MEMORY_BARRIER()
#define GCC_IS_COMPILE_CONST(x) 0
#define GCC_IS_COMPILE_CONST(x) 0
#endif
#endif

6
LUFA/Common/Endianness.h
View File

@ -394,6 +394,9 @@
static inline uint16_t SwapEndian_16(const uint16_t Word) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
static inline uint16_t SwapEndian_16(const uint16_t Word)
{
if (GCC_IS_COMPILE_CONST(Word))
return SWAPENDIAN_16(Word);
uint8_t Temp;
union
@ -420,6 +423,9 @@
static inline uint32_t SwapEndian_32(const uint32_t DWord) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
static inline uint32_t SwapEndian_32(const uint32_t DWord)
{
if (GCC_IS_COMPILE_CONST(DWord))
return SWAPENDIAN_32(DWord);
uint8_t Temp;
union

1
LUFA/ManPages/ChangeLog.txt
View File

@ -75,6 +75,7 @@
* - Fixed KeyboardHost and KeyboardHostWithParser demos displaying incorrect values when numerical keys were pressed
* - Fixed compile errors in the incomplete BluetoothHost demo application (thanks to Timo Lindfors)
* - Fixed incorrect Dataflash buffer use in the DataflashManager_WriteBlocks_RAM() function of several demos/projects (thanks to Jeremy Willden)
* - Fixed incorrect logging interval (always 500ms longer than requested) in the TempDataLogger project
*
* \section Sec_ChangeLog110528 Version 110528
* <b>New:</b>