optimize: replace while loop by memcpy

There is no need to use a while loop here. This patch simple copy
the last bytes with the system function.

Change-Id: Ibda72dca449746efeba5a1af2e45c5990f9cf347
Signed-off-by: Mathias K <kesmtp@freenet.de>
Reviewed-on: http://openocd.zylin.com/364


Tested-by: jenkins
Reviewed-by: Øyvind Harboe <oyvindharboe@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/flash/nor/stellaris.c

@@ -1214,14 +1214,9 @@ static int stellaris_write(struct flash_bank *bank, uint8_t *buffer, uint32_t of
 	if (bytes_remaining)
 	{
 		uint8_t last_word[4] = {0xff, 0xff, 0xff, 0xff};
-		int i = 0;
 
-		while (bytes_remaining > 0)
-		{
-			last_word[i++] = *(buffer + bytes_written);
-			bytes_remaining--;
-			bytes_written++;
-		}
+		/* copy the last remaining bytes into the write buffer */
+		memcpy(last_word, buffer+bytes_written, bytes_remaining);
 
 		if (!(address & 0xff))
 			LOG_DEBUG("0x%" PRIx32 "", address);

src/flash/nor/stm32lx.c

@@ -464,17 +464,12 @@ static int stm32lx_write(struct flash_bank *bank, uint8_t *buffer,
 
 	if (bytes_remaining)
 	{
-		uint32_t value = 0;
-		for (int i = 0; i < 4; i++)
-		{
-			if (bytes_remaining)
-			{
-				value += (buffer[i] << (8 * i));
-				bytes_remaining--;
-			}
-		}
+		uint8_t last_word[4] = {0xff, 0xff, 0xff, 0xff};
 
-		retval = target_write_u32(target, address, value);
+		/* copy the last remaining bytes into the write buffer */
+		memcpy(last_word, buffer+bytes_written, bytes_remaining);
+
+		retval = target_write_buffer(target, address, 4, last_word);
 		if (retval != ERROR_OK)
 			return retval;
 

src/flash/nor/str7x.c

@@ -707,14 +707,9 @@ static int str7x_write(struct flash_bank *bank, uint8_t *buffer,
 	if (bytes_remaining)
 	{
 		uint8_t last_dword[8] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
-		i = 0;
 
-		while (bytes_remaining > 0)
-		{
-			last_dword[i++] = *(buffer + bytes_written);
-			bytes_remaining--;
-			bytes_written++;
-		}
+		/* copy the last remaining bytes into the write buffer */
+		memcpy(last_dword, buffer+bytes_written, bytes_remaining);
 
 		/* command */
 		cmd = FLASH_DWPG;

src/flash/nor/str9x.c

@@ -618,14 +618,9 @@ static int str9x_write(struct flash_bank *bank,
 	if (bytes_remaining)
 	{
 		uint8_t last_halfword[2] = {0xff, 0xff};
-		i = 0;
 
-		while (bytes_remaining > 0)
-		{
-			last_halfword[i++] = *(buffer + bytes_written);
-			bytes_remaining--;
-			bytes_written++;
-		}
+		/* copy the last remaining bytes into the write buffer */
+		memcpy(last_halfword, buffer+bytes_written, bytes_remaining);
 
 		bank_adr = address & ~0x03;
 

src/flash/nor/str9xpec.c

@@ -714,14 +714,9 @@ static int str9xpec_write(struct flash_bank *bank, uint8_t *buffer,
 	if (bytes_remaining)
 	{
 		uint8_t last_dword[8] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
-		i = 0;
 
-		while (bytes_remaining > 0)
-		{
-			last_dword[i++] = *(buffer + bytes_written);
-			bytes_remaining--;
-			bytes_written++;
-		}
+		/* copy the last remaining bytes into the write buffer */
+		memcpy(last_dword, buffer+bytes_written, bytes_remaining);
 
 		str9xpec_set_instr(tap, ISC_PROGRAM, TAP_IRPAUSE);