diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2024-02-03 11:45:23 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2024-02-16 14:30:17 +0100 |
| commit | dcd3e1de9d17dc43dfed87a9fc814b9dec508043 (patch) | |
| tree | f4dc28be4bafb8cde3a619428250517fac82244d /arch/s390/include/asm/fpu-insn-asm.h | |
| parent | cb2a1dd589a0ce97429bf2beeb560e5b030c2ccc (diff) | |
s390/checksum: provide csum_partial_copy_nocheck()
With csum_partial(), which reads all bytes into registers it is easy to
also implement csum_partial_copy_nocheck() which copies the buffer while
calculating its checksum.
For a 512 byte buffer this reduces the runtime by 19%. Compared to the old
generic variant (memcpy() + cksm instruction) runtime is reduced by 42%).
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/fpu-insn-asm.h')
| -rw-r--r-- | arch/s390/include/asm/fpu-insn-asm.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/s390/include/asm/fpu-insn-asm.h b/arch/s390/include/asm/fpu-insn-asm.h index aaf42c513a21..02ccfe46050a 100644 --- a/arch/s390/include/asm/fpu-insn-asm.h +++ b/arch/s390/include/asm/fpu-insn-asm.h @@ -531,6 +531,16 @@ MRXBOPC 0, 0x37, v1 .endm +/* VECTOR STORE WITH LENGTH */ +.macro VSTL v, gr, disp, base + VX_NUM v1, \v + GR_NUM b2, \base + GR_NUM r3, \gr + .word 0xE700 | ((v1&15) << 4) | r3 + .word (b2 << 12) | (\disp) + MRXBOPC 0, 0x3f, v1 +.endm + /* Vector integer instructions */ /* VECTOR AND */ |