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

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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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10
lonetix/include/df/bufio.h
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@ -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) \
#define 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)