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Endian conversion using builtin functions [optimization] #217

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Endian conversion using builtin functions [optimization] #217

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70 changes: 26 additions & 44 deletions src/endianconv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -41,85 +41,67 @@
* POSSIBILITY OF SUCH DAMAGE.
*/


#include <stdint.h>

/* Toggle the 16 bit unsigned integer pointed by *p from little endian to
* big endian */
void memrev16(void *p) {
unsigned char *x = p, t;

t = x[0];
x[0] = x[1];
x[1] = t;
void memrev16(void *p)
{
uint16_t *p16 = (uint16_t *)p;
*p16 = __builtin_bswap16(*p16);
}

/* Toggle the 32 bit unsigned integer pointed by *p from little endian to
* big endian */
void memrev32(void *p) {
unsigned char *x = p, t;

t = x[0];
x[0] = x[3];
x[3] = t;
t = x[1];
x[1] = x[2];
x[2] = t;
void memrev32(void *p)
{
uint32_t *p32 = (uint32_t *)p;
*p32 = __builtin_bswap32(*p32);
}

/* Toggle the 64 bit unsigned integer pointed by *p from little endian to
* big endian */
void memrev64(void *p) {
unsigned char *x = p, t;

t = x[0];
x[0] = x[7];
x[7] = t;
t = x[1];
x[1] = x[6];
x[6] = t;
t = x[2];
x[2] = x[5];
x[5] = t;
t = x[3];
x[3] = x[4];
x[4] = t;
void memrev64(void *p)
{
uint64_t *p64 = (uint64_t *)p;
*p64 = __builtin_bswap64(*p64);
}

uint16_t intrev16(uint16_t v) {
memrev16(&v);
return v;
uint16_t intrev16(uint16_t v)
{
return __builtin_bswap16(v);
}

uint32_t intrev32(uint32_t v) {
memrev32(&v);
return v;
uint32_t intrev32(uint32_t v)
{
return __builtin_bswap32(v);
}

uint64_t intrev64(uint64_t v) {
memrev64(&v);
return v;
uint64_t intrev64(uint64_t v)
{
return __builtin_bswap64(v);
}

#ifdef REDIS_TEST
#include <stdio.h>

#define UNUSED(x) (void)(x)
int endianconvTest(int argc, char *argv[]) {
int endianconvTest(int argc, char *argv[])
{
char buf[32];

UNUSED(argc);
UNUSED(argv);

sprintf(buf,"ciaoroma");
sprintf(buf, "ciaoroma");
memrev16(buf);
printf("%s\n", buf);

sprintf(buf,"ciaoroma");
sprintf(buf, "ciaoroma");
memrev32(buf);
printf("%s\n", buf);

sprintf(buf,"ciaoroma");
sprintf(buf, "ciaoroma");
memrev64(buf);
printf("%s\n", buf);

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