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Diffstat (limited to 'arch/tile/lib/memchr_64.c')
-rw-r--r--arch/tile/lib/memchr_64.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/tile/lib/memchr_64.c b/arch/tile/lib/memchr_64.c
new file mode 100644
index 00000000000..84fdc8d8e73
--- /dev/null
+++ b/arch/tile/lib/memchr_64.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2011 Tilera Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/module.h>
+
+void *memchr(const void *s, int c, size_t n)
+{
+ const uint64_t *last_word_ptr;
+ const uint64_t *p;
+ const char *last_byte_ptr;
+ uintptr_t s_int;
+ uint64_t goal, before_mask, v, bits;
+ char *ret;
+
+ if (__builtin_expect(n == 0, 0)) {
+ /* Don't dereference any memory if the array is empty. */
+ return NULL;
+ }
+
+ /* Get an aligned pointer. */
+ s_int = (uintptr_t) s;
+ p = (const uint64_t *)(s_int & -8);
+
+ /* Create eight copies of the byte for which we are looking. */
+ goal = 0x0101010101010101ULL * (uint8_t) c;
+
+ /* Read the first word, but munge it so that bytes before the array
+ * will not match goal.
+ *
+ * Note that this shift count expression works because we know
+ * shift counts are taken mod 64.
+ */
+ before_mask = (1ULL << (s_int << 3)) - 1;
+ v = (*p | before_mask) ^ (goal & before_mask);
+
+ /* Compute the address of the last byte. */
+ last_byte_ptr = (const char *)s + n - 1;
+
+ /* Compute the address of the word containing the last byte. */
+ last_word_ptr = (const uint64_t *)((uintptr_t) last_byte_ptr & -8);
+
+ while ((bits = __insn_v1cmpeq(v, goal)) == 0) {
+ if (__builtin_expect(p == last_word_ptr, 0)) {
+ /* We already read the last word in the array,
+ * so give up.
+ */
+ return NULL;
+ }
+ v = *++p;
+ }
+
+ /* We found a match, but it might be in a byte past the end
+ * of the array.
+ */
+ ret = ((char *)p) + (__insn_ctz(bits) >> 3);
+ return (ret <= last_byte_ptr) ? ret : NULL;
+}
+EXPORT_SYMBOL(memchr);