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path: root/arch/tile/lib/memchr_32.c
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Diffstat (limited to 'arch/tile/lib/memchr_32.c')
-rw-r--r--arch/tile/lib/memchr_32.c35
1 files changed, 19 insertions, 16 deletions
diff --git a/arch/tile/lib/memchr_32.c b/arch/tile/lib/memchr_32.c
index 6235283b4859..cc3d9badf030 100644
--- a/arch/tile/lib/memchr_32.c
+++ b/arch/tile/lib/memchr_32.c
@@ -18,12 +18,24 @@
void *memchr(const void *s, int c, size_t n)
{
+ const uint32_t *last_word_ptr;
+ const uint32_t *p;
+ const char *last_byte_ptr;
+ uintptr_t s_int;
+ uint32_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. */
- const uintptr_t s_int = (uintptr_t) s;
- const uint32_t *p = (const uint32_t *)(s_int & -4);
+ s_int = (uintptr_t) s;
+ p = (const uint32_t *)(s_int & -4);
/* Create four copies of the byte for which we are looking. */
- const uint32_t goal = 0x01010101 * (uint8_t) c;
+ goal = 0x01010101 * (uint8_t) c;
/* Read the first word, but munge it so that bytes before the array
* will not match goal.
@@ -31,23 +43,14 @@ void *memchr(const void *s, int c, size_t n)
* Note that this shift count expression works because we know
* shift counts are taken mod 32.
*/
- const uint32_t before_mask = (1 << (s_int << 3)) - 1;
- uint32_t v = (*p | before_mask) ^ (goal & before_mask);
+ before_mask = (1 << (s_int << 3)) - 1;
+ v = (*p | before_mask) ^ (goal & before_mask);
/* Compute the address of the last byte. */
- const char *const last_byte_ptr = (const char *)s + n - 1;
+ last_byte_ptr = (const char *)s + n - 1;
/* Compute the address of the word containing the last byte. */
- const uint32_t *const last_word_ptr =
- (const uint32_t *)((uintptr_t) last_byte_ptr & -4);
-
- uint32_t bits;
- char *ret;
-
- if (__builtin_expect(n == 0, 0)) {
- /* Don't dereference any memory if the array is empty. */
- return NULL;
- }
+ last_word_ptr = (const uint32_t *)((uintptr_t) last_byte_ptr & -4);
while ((bits = __insn_seqb(v, goal)) == 0) {
if (__builtin_expect(p == last_word_ptr, 0)) {