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Make stderr go faster

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This change makes _IONBF (unbuffered) stdio handles go 20x faster for
certain kinds of formatting directives by being smarter about buffers
This commit is contained in:
Justine Tunney 2023-08-11 11:56:35 -07:00
parent 2cbd09b4d4
commit 8fc778162e
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GPG key ID: BE714B4575D6E328
6 changed files with 70 additions and 38 deletions
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28
libc/fmt/divmod10.internal.h
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@ -2,23 +2,23 @@
#define COSMOPOLITAN_LIBC_FMT_DIVMOD10_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
forceinline uint64_t DivMod10(uint64_t x, unsigned *r) {
forceinline uint64_t __divmod10(uint64_t __x, unsigned *__r) {
#if defined(__STRICT_ANSI__) || !defined(__GNUC__) || \
(defined(__OPTIMIZE__) && !defined(__OPTIMIZE_SIZE__))
*r = x % 10;
return x / 10;
*__r = __x % 10;
return __x / 10;
#else
uint128_t dw;
unsigned long long hi, rm;
dw = x;
dw *= 0xcccccccccccccccdull;
hi = dw >> 64;
hi >>= 3;
rm = hi;
rm += rm << 2;
rm += rm;
*r = x - rm;
return hi;
uint128_t __dw;
unsigned long long __hi, __rm;
__dw = __x;
__dw *= 0xcccccccccccccccdull;
__hi = __dw >> 64;
__hi >>= 3;
__rm = __hi;
__rm += __rm << 2;
__rm += __rm;
*__r = __x - __rm;
return __hi;
#endif
}