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speed up float_to_bits

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Reduce overhead caused by inefficient call of read
for each float. Increases speed about 50x.
This commit is contained in:
Jiří Pinkava 2014-10-03 14:56:52 +02:00
parent f30c673b5b
commit 4139011a3a
1 changed files with 19 additions and 10 deletions
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27
src/float_to_bits.c
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@ -71,6 +71,9 @@ static void sym_int2bits(int sym, uint8_t *ret)
}
}
// size of IO buffers (number of elements)
#define BUF_SIZE 1024
int main(int argc, char **argv)
{
int fd, fd_out, opt;
@ -104,21 +107,27 @@ int main(int argc, char **argv)
}
while (1) {
int rc;
float fl;
uint8_t bits[2];
rc = read(fd, &fl, sizeof(fl));
float fl[BUF_SIZE];
uint8_t bits[2*BUF_SIZE];
rc = read(fd, fl, sizeof(*fl) * BUF_SIZE);
if (rc < 0) {
perror("read");
exit(1);
} else if (rc == 0)
} else if (rc == 0) {
break;
rc = process_sym_fl(fl);
sym_int2bits(rc, bits);
}
rc /= sizeof(*fl);
int i;
for (i = 0; i < rc; ++i) {
int sym = process_sym_fl(fl[i]);
sym_int2bits(sym, bits + i*2);
//printf("%2d %1u %1u %f\n", rc, bits[0], bits[1], fl);
if (opt_verbose)
printf("%1u%1u", bits[0], bits[1]);
if (opt_verbose) {
printf("%1u%1u", bits[2*i + 0], bits[2*i + 1]);
}
}
rc = write(fd_out, bits, 2);
rc = write(fd_out, bits, rc * 2);
if (rc < 0) {
perror("write");
exit(1);