12677f2 · text · git.iko.soy

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encodeUtf8: squeeze out a little more fast path performance

12677f2Bryan O'Sullivan13 years ago

cbits/cbits.c+14−1

@@ -245,8 +245,21 @@ _hs_text_encode_utf8(uint8_t **destp, const uint16_t *src, size_t srcoff,

245 while (srcend - src >= 4) {

246 uint64_t w = *((uint64_t *) src);

247

248− if (w & 0xFF80FF80FF80FF80ULL)

248+ if (w & 0xFF80FF80FF80FF80ULL) {

249+ if (!(w & 0x000000000000FF80ULL)) {

250+ *dest++ = w & 0xFFFF;

251+ src++;

252+ if (!(w & 0x00000000FF800000ULL)) {

253+ *dest++ = (w >> 16) & 0xFFFF;

254+ src++;

255+ if (!(w & 0x0000FF8000000000ULL)) {

256+ *dest++ = (w >> 32) & 0xFFFF;

257+ src++;

258+ }

259+ }

260+ }

249 break;

261 break;

262+ }

250 *dest++ = w & 0xFFFF;

263 *dest++ = w & 0xFFFF;

251 *dest++ = (w >> 16) & 0xFFFF;

264 *dest++ = (w >> 16) & 0xFFFF;

252 *dest++ = (w >> 32) & 0xFFFF;

265 *dest++ = (w >> 32) & 0xFFFF;