1 files changed, 96 insertions, 0 deletions
diff --git a/intl/uconv/nsUTF8ToUnicodeSSE2.cpp b/intl/uconv/nsUTF8ToUnicodeSSE2.cpp
new file mode 100644
index 000000000..58e92be9b
--- /dev/null
+++ b/intl/uconv/nsUTF8ToUnicodeSSE2.cpp
@@ -0,0 +1,96 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This file should only be compiled if you're on x86 or x86_64.  Additionally,
+// you'll need to compile this file with -msse2 if you're using gcc.
+
+#include <emmintrin.h>
+#include "nscore.h"
+
+namespace mozilla {
+namespace SSE2 {
+
+void
+Convert_ascii_run(const char *&src,
+                  char16_t  *&dst,
+                  int32_t      len)
+{
+  if (len > 15) {
+    __m128i in, out1, out2;
+    __m128d *outp1, *outp2;
+    __m128i zeroes;
+    uint32_t offset;
+
+    // align input to 16 bytes
+    while ((NS_PTR_TO_UINT32(src) & 15) && len > 0) {
+      if (*src & 0x80U)
+        return;
+      *dst++ = (char16_t) *src++;
+      len--;
+    }
+
+    zeroes = _mm_setzero_si128();
+
+    offset = NS_PTR_TO_UINT32(dst) & 15;
+
+    // Note: all these inner loops have to break, not return; we need
+    // to let the single-char loop below catch any leftover
+    // byte-at-a-time ASCII chars, since this function must consume
+    // all available ASCII chars before it returns
+
+    if (offset == 0) {
+      while (len > 15) {
+        in = _mm_load_si128((__m128i *) src);
+        if (_mm_movemask_epi8(in))
+          break;
+        out1 = _mm_unpacklo_epi8(in, zeroes);
+        out2 = _mm_unpackhi_epi8(in, zeroes);
+        _mm_stream_si128((__m128i *) dst, out1);
+        _mm_stream_si128((__m128i *) (dst + 8), out2);
+        dst += 16;
+        src += 16;
+        len -= 16;
+      }
+    } else if (offset == 8) {
+      outp1 = (__m128d *) &out1;
+      outp2 = (__m128d *) &out2;
+      while (len > 15) {
+        in = _mm_load_si128((__m128i *) src);
+        if (_mm_movemask_epi8(in))
+          break;
+        out1 = _mm_unpacklo_epi8(in, zeroes);
+        out2 = _mm_unpackhi_epi8(in, zeroes);
+        _mm_storel_epi64((__m128i *) dst, out1);
+        _mm_storel_epi64((__m128i *) (dst + 8), out2);
+        _mm_storeh_pd((double *) (dst + 4), *outp1);
+        _mm_storeh_pd((double *) (dst + 12), *outp2);
+        src += 16;
+        dst += 16;
+        len -= 16;
+      }
+    } else {
+      while (len > 15) {
+        in = _mm_load_si128((__m128i *) src);
+        if (_mm_movemask_epi8(in))
+          break;
+        out1 = _mm_unpacklo_epi8(in, zeroes);
+        out2 = _mm_unpackhi_epi8(in, zeroes);
+        _mm_storeu_si128((__m128i *) dst, out1);
+        _mm_storeu_si128((__m128i *) (dst + 8), out2);
+        src += 16;
+        dst += 16;
+        len -= 16;
+      }
+    }
+  }
+
+  // finish off a byte at a time
+
+  while (len-- > 0 && (*src & 0x80U) == 0) {
+    *dst++ = (char16_t) *src++;
+  }
+}
+
+} // namespace SSE2
+} // namespace mozilla