diff --git a/src/nfa/arm/truffle.hpp b/src/nfa/arm/truffle.hpp
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+/*
+ * Copyright (c) 2015-2017, Intel Corporation
+ * Copyright (c) 2020-2021, VectorCamp PC
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of Intel Corporation nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** \file
+ * \brief Truffle: character class acceleration.
+ *
+ */
+
+template <uint16_t S>
+static really_inline
+const SuperVector<S> blockSingleMask(SuperVector<S> shuf_mask_lo_highclear, SuperVector<S> shuf_mask_lo_highset, SuperVector<S> chars) {
+
+    chars.print8("chars");
+    shuf_mask_lo_highclear.print8("shuf_mask_lo_highclear");
+    shuf_mask_lo_highset.print8("shuf_mask_lo_highset");
+
+    SuperVector<S> highconst = SuperVector<S>::dup_u8(0x80);
+    highconst.print8("highconst");
+    SuperVector<S> shuf_mask_hi = SuperVector<S>::dup_u64(0x8040201008040201);
+    shuf_mask_hi.print8("shuf_mask_hi");
+    
+    SuperVector<S> shuf1 = shuf_mask_lo_highclear.pshufb(chars);
+    shuf1.print8("shuf1");
+    SuperVector<S> t1 = chars ^ highconst;
+    t1.print8("t1");
+    SuperVector<S> shuf2 = shuf_mask_lo_highset.pshufb(t1);
+    shuf2.print8("shuf2");
+    SuperVector<S> t2 = highconst.opandnot(chars.template vshr_64_imm<4>());
+    t2.print8("t2");
+    SuperVector<S> shuf3 = shuf_mask_hi.pshufb(t2);
+    shuf3.print8("shuf3");
+    SuperVector<S> res = (shuf1 | shuf2) & shuf3;
+    res.print8("(shuf1 | shuf2) & shuf3");
+
+    return !res.eq(SuperVector<S>::Zeroes());
+}