add-len-check.patch
text/x-patch
Patch
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API reference →
Format: unified
| File | + | − |
|---|---|---|
| src/port/pg_crc32c_armv8.c | 12 | 3 |
diff --git a/src/port/pg_crc32c_armv8.c b/src/port/pg_crc32c_armv8.c
index 5fa57fb4927..682e8a1ca5d 100644
--- a/src/port/pg_crc32c_armv8.c
+++ b/src/port/pg_crc32c_armv8.c
@@ -127,19 +127,28 @@ pg_comp_crc32c_pmull(pg_crc32c crc, const void *data, size_t len)
pg_crc32c crc0 = crc;
const char *buf = data;
+ /*
+ * Immediately fall back to scalar path if the vector path is not
+ * guaranteed to perform at least one iteration after the alignment
+ * preamble.
+ */
+ if (len < 5 * sizeof(uint64x2_t))
+ return pg_comp_crc32c_armv8(crc, data, len);
+
/* align to 16 bytes */
- for (; len && ((uintptr_t) buf & 7); --len)
+ for (; (uintptr_t) buf & 7; --len)
{
crc0 = __crc32cb(crc0, *buf++);
}
- if (((uintptr_t) buf & 8) && len >= 8)
+ if ((uintptr_t) buf & 8)
{
crc0 = __crc32cd(crc0, *(const uint64_t *) buf);
buf += 8;
len -= 8;
}
- if (len >= 64)
+ Assert(len >= 64);
+
{
const char *end = buf + len;
const char *limit = buf + len - 64;