mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
94 lines
3.8 KiB
C
94 lines
3.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/intrin/pcmpgtb.h"
|
|
#include "libc/intrin/pmovmskb.h"
|
|
#include "libc/intrin/punpckhbw.h"
|
|
#include "libc/intrin/punpcklbw.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/str/thompike.h"
|
|
#include "libc/str/utf16.h"
|
|
|
|
/* 34x speedup for ascii */
|
|
static inline noasan axdx_t tprecode8to16_sse2(char16_t *dst, size_t dstsize,
|
|
const char *src, axdx_t r) {
|
|
uint8_t v1[16], v2[16], vz[16];
|
|
__builtin_memset(vz, 0, 16);
|
|
while (r.ax + 16 < dstsize) {
|
|
__builtin_memcpy(v1, src + r.dx, 16);
|
|
pcmpgtb((int8_t *)v2, (int8_t *)v1, (int8_t *)vz);
|
|
if (pmovmskb(v2) != 0xFFFF) break;
|
|
punpcklbw(v2, v1, vz);
|
|
punpckhbw(v1, v1, vz);
|
|
__builtin_memcpy(dst + r.ax + 0, v2, 16);
|
|
__builtin_memcpy(dst + r.ax + 8, v1, 16);
|
|
r.ax += 16;
|
|
r.dx += 16;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* Transcodes UTF-8 to UTF-16.
|
|
*
|
|
* This is a low-level function intended for the core runtime. Use
|
|
* utf8to16() for a much better API that uses malloc().
|
|
*
|
|
* @param dst is output buffer
|
|
* @param dstsize is shorts in dst
|
|
* @param src is NUL-terminated UTF-8 input string
|
|
* @return ax shorts written excluding nul
|
|
* @return dx index of character after nul word in src
|
|
*/
|
|
axdx_t tprecode8to16(char16_t *dst, size_t dstsize, const char *src) {
|
|
axdx_t r;
|
|
unsigned w;
|
|
int x, y, a, b, i, n;
|
|
r.ax = 0;
|
|
r.dx = 0;
|
|
for (;;) {
|
|
if (!IsTiny() && !((uintptr_t)(src + r.dx) & 15)) {
|
|
r = tprecode8to16_sse2(dst, dstsize, src, r);
|
|
}
|
|
x = src[r.dx++] & 0377;
|
|
if (x >= 0300) {
|
|
a = ThomPikeByte(x);
|
|
n = ThomPikeLen(x) - 1;
|
|
for (i = 0;;) {
|
|
if (!(b = src[r.dx + i] & 0377)) break;
|
|
if (!ThomPikeCont(b)) break;
|
|
a = ThomPikeMerge(a, b);
|
|
if (++i == n) {
|
|
r.dx += i;
|
|
x = a;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (!x) break;
|
|
w = EncodeUtf16(x);
|
|
while (w && r.ax + 1 < dstsize) {
|
|
dst[r.ax++] = w;
|
|
w >>= 16;
|
|
}
|
|
}
|
|
if (r.ax < dstsize) {
|
|
dst[r.ax] = 0;
|
|
}
|
|
return r;
|
|
}
|