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[lonetix/bufio] Optimize buffer write operations avoiding copies, also introduce smallbytecopy.h

This commit is contained in:
Lorenzo Cogotti 2021-10-18 12:04:07 +02:00
parent 5ab4cd72a8
commit 45d9b20b9e
2 changed files with 42 additions and 14 deletions
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46
lonetix/bufio.c
View File

@ -12,6 +12,7 @@
#include "sys/sys_local.h" // for Sys_SetErrStat() - vsnprintf()
#include "bufio.h"
#include "numlib.h"
#include "smallbytecopy.h"
#include <assert.h>
#include <errno.h>
@ -73,7 +74,7 @@ void Bufio_Close(Stmrdbuf *sb)
if (sb->ops->Close) sb->ops->Close(sb->streamp);
}
Sint64 Bufio_Flush(Stmwrbuf *sb)
NOINLINE Sint64 Bufio_Flush(Stmwrbuf *sb)
{
assert(sb->ops->Write);
@ -90,6 +91,16 @@ Sint64 Bufio_Flush(Stmwrbuf *sb)
return sb->totalOut;
}
Sint64 _Bufio_SmallPutsn(Stmwrbuf *sb, const char *s, size_t nbytes)
{
if (sb->availOut + nbytes > sizeof(sb->buf) && Bufio_Flush(sb) == -1)
return -1;
_smallbytecopy64(sb->buf + sb->availOut, s, nbytes);
sb->availOut += nbytes;
return nbytes;
}
Sint64 _Bufio_Putsn(Stmwrbuf *sb, const char *s, size_t nbytes)
{
if (sb->availOut + nbytes > sizeof(sb->buf) && Bufio_Flush(sb) == -1)
@ -104,26 +115,41 @@ Sint64 _Bufio_Putsn(Stmwrbuf *sb, const char *s, size_t nbytes)
Sint64 Bufio_Putu(Stmwrbuf *sb, unsigned long long val)
{
char buf[DIGS(val) + 1];
if (sb->availOut + DIGS(val) + 1 > sizeof(sb->buf) && Bufio_Flush(sb) == -1)
return -1;
char *eptr = Utoa(val, buf);
return Bufio_Putsn(sb, buf, eptr - buf);
char *sptr = sb->buf + sb->availOut;
char *eptr = Utoa(val, sptr);
Sint64 n = eptr - sptr;
sb->availOut += n;
return n;
}
Sint64 Bufio_Putx(Stmwrbuf *sb, unsigned long long val)
{
char buf[XDIGS(val) + 1];
if (sb->availOut + XDIGS(val) + 1 > sizeof(sb->buf) && Bufio_Flush(sb) == -1)
return -1;
char *eptr = Xtoa(val, buf);
return Bufio_Putsn(sb, buf, eptr - buf);
char *sptr = sb->buf + sb->availOut;
char *eptr = Xtoa(val, sptr);
Sint64 n = eptr - sptr;
sb->availOut += n;
return n;
}
Sint64 Bufio_Puti(Stmwrbuf *sb, long long val)
{
char buf[1 + DIGS(val) + 1];
if (sb->availOut + 1 + DIGS(val) + 1 > sizeof(sb->buf) && Bufio_Flush(sb) == -1)
return -1;
char *eptr = Itoa(val, buf);
return Bufio_Putsn(sb, buf, eptr - buf);
char *sptr = sb->buf + sb->availOut;
char *eptr = Itoa(val, sptr);
Sint64 n = eptr - sptr;
sb->availOut += n;
return n;
}
Sint64 Bufio_Putf(Stmwrbuf *sb, double val)

8
lonetix/include/df/bufio.h
View File

@ -172,14 +172,16 @@ FORCE_INLINE Sint64 Bufio_Putc(Stmwrbuf *sb, char c)
* `nbytes`), -1 on error.
*/
Sint64 _Bufio_Putsn(Stmwrbuf *, const char *, size_t);
Sint64 _Bufio_SmallPutsn(Stmwrbuf *, const char *, size_t);
#ifdef __GNUC__
// Optimize to call Bufio_Putc() if 'nbytes' is statically known to be 1
// NOTE: Avoids needless EOLN overhead on Unix
#define Bufio_Putsn(sb, s, nbytes) ( \
(__builtin_constant_p(nbytes) && (nbytes) == 1) ? \
Bufio_Putc(sb, (s)[0]) : \
_Bufio_Putsn(sb, s, nbytes) \
(__builtin_constant_p(nbytes) && (nbytes) <= 64) ? \
(((nbytes) == 1) ? Bufio_Putc(sb, (s)[0]) \
: _Bufio_SmallPutsn(sb, s, nbytes)) \
: _Bufio_Putsn(sb, s, nbytes) \
)
#else
#define Bufio_Putsn(sb, s, nbytes) _Bufio_Putsn(sb, s, nbytes)