12677f2 · text · git.iko.soy

encodeUtf8: squeeze out a little more fast path performance

If we're about to drop from the fast to the slow path, try to cut our losses by pushing out a few more bytes before we give up.

commit12677f25326dce692f702e4dc95e88b80b5bf960 authorBryan O'Sullivan <bos@serpentine.com> dateThu 9 Jan 2014, 15:13 (13 years ago) parentdf38ae8

1 file changed+14−1

unifiedsplit

cbits/cbits.c+14−1

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

245245 while (srcend - src >= 4) {

246246 uint64_t w = *((uint64_t *) src);

247247

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+ }

249261 break;

262+ }

250263 *dest++ = w & 0xFFFF;

251264 *dest++ = (w >> 16) & 0xFFFF;

252265 *dest++ = (w >> 32) & 0xFFFF;