diff options
| -rw-r--r-- | arch/x86/lib/crc32-glue.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/lib/crc32-glue.c b/arch/x86/lib/crc32-glue.c index 4b4721176799..e3f93b17ac3f 100644 --- a/arch/x86/lib/crc32-glue.c +++ b/arch/x86/lib/crc32-glue.c @@ -57,7 +57,15 @@ u32 crc32c_arch(u32 crc, const u8 *p, size_t len) num_longs != 0; num_longs--, p += sizeof(unsigned long)) asm(CRC32_INST : "+r" (crc) : ASM_INPUT_RM (*(unsigned long *)p)); - for (len %= sizeof(unsigned long); len; len--, p++) + if (sizeof(unsigned long) > 4 && (len & 4)) { + asm("crc32l %1, %0" : "+r" (crc) : ASM_INPUT_RM (*(u32 *)p)); + p += 4; + } + if (len & 2) { + asm("crc32w %1, %0" : "+r" (crc) : ASM_INPUT_RM (*(u16 *)p)); + p += 2; + } + if (len & 1) asm("crc32b %1, %0" : "+r" (crc) : ASM_INPUT_RM (*p)); return crc; |