move firstMatch, lastMatch to own header in util

src/util/match.hpp

@@ -0,0 +1,102 @@
+/*
+ * 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.
+ */
+
+#include "ue2common.h"
+#include "util/arch.h"
+#include "util/bitutils.h"
+#include "util/unaligned.h"
+
+#include "util/supervector/supervector.hpp"
+
+template <u16 S>
+const u8 *firstMatch(const u8 *buf, typename SuperVector<S>::movemask_type z);
+
+template <u16 S>
+const u8 *lastMatch(const u8 *buf, typename SuperVector<S>::movemask_type z);
+
+template <>
+really_really_inline
+const u8 *firstMatch<16>(const u8 *buf, typename SuperVector<16>::movemask_type z) {
+    DEBUG_PRINTF("buf %p z %08x \n", buf, z);
+    DEBUG_PRINTF("z %08x\n", z);
+    if (unlikely(z != 0xffff)) {
+        u32 pos = ctz32(~z & 0xffff);
+        DEBUG_PRINTF("~z %08x\n", ~z);
+        DEBUG_PRINTF("match @ pos %u\n", pos);
+        assert(pos < 16);
+        return buf + pos;
+    } else {
+        return NULL; // no match
+    }
+}
+
+template <>
+really_really_inline
+const u8 *firstMatch<64>(const u8 *buf, typename SuperVector<64>::movemask_type z) {
+    DEBUG_PRINTF("z 0x%016llx\n", z);
+    if (unlikely(z != ~0ULL)) {
+        u32 pos = ctz64(~z);
+        DEBUG_PRINTF("match @ pos %u\n", pos);
+        assert(pos < 64);
+        return buf + pos;
+    } else {
+        return NULL; // no match
+    }
+}
+
+template <>
+really_really_inline
+const u8 *lastMatch<16>(const u8 *buf, typename SuperVector<16>::movemask_type z) {
+    DEBUG_PRINTF("buf %p z %08x \n", buf, z);
+    DEBUG_PRINTF("z %08x\n", z);
+    if (unlikely(z != 0xffff)) {
+        u32 pos = clz32(~z & 0xffff);
+        DEBUG_PRINTF("~z %08x\n", ~z);
+        DEBUG_PRINTF("match @ pos %u\n", pos);
+        assert(pos >= 16 && pos < 32);
+        return buf + (31 - pos);
+    } else {
+        return NULL; // no match
+    }
+}
+
+template <>
+really_really_inline
+const u8 *lastMatch<64>(const u8 *buf, typename SuperVector<64>::movemask_type z) {
+    DEBUG_PRINTF("z 0x%016llx\n", z);
+    if (unlikely(z != ~0ULL)) {
+        u32 pos = clz64(~z);
+        DEBUG_PRINTF("match @ pos %u\n", pos);
+        assert(pos < 64);
+        return buf + pos;
+    } else {
+        return NULL; // no match
+    }
+}
+