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Subject[PATCH] arm64:crc:accelerated-crc32-by-64bytes
Date
add 64 bytes loop to acceleration calculation

Signed-off-by: Rui Sun <sunrui26@huawei.com>
---
arch/arm64/lib/crc32.S | 54 ++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 50 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/lib/crc32.S b/arch/arm64/lib/crc32.S
index 5bc1e85..2b37009 100644
--- a/arch/arm64/lib/crc32.S
+++ b/arch/arm64/lib/crc32.S
@@ -15,15 +15,61 @@
.cpu generic+crc

.macro __crc32, c
-0: subs x2, x2, #16
- b.mi 8f
+
+64: cmp x2, #64
+ b.lt 32f
+
+ adds x11, x1, #16
+ adds x12, x1, #32
+ adds x13, x1, #48
+
+0 : subs x2, x2, #64
+ b.mi 32f
+
+ ldp x3, x4, [x1], #64
+ ldp x5, x6, [x11], #64
+ ldp x7, x8, [x12], #64
+ ldp x9, x10,[x13], #64
+
+ CPU_BE( rev x3, x3 )
+ CPU_BE( rev x4, x4 )
+ CPU_BE( rev x5, x5 )
+ CPU_BE( rev x6, x6 )
+ CPU_BE( rev x7, x7 )
+ CPU_BE( rev x8, x8 )
+ CPU_BE( rev x9, x9 )
+ CPU_BE( rev x10,x10 )
+
+ crc32\c\()x w0, w0, x3
+ crc32\c\()x w0, w0, x4
+ crc32\c\()x w0, w0, x5
+ crc32\c\()x w0, w0, x6
+ crc32\c\()x w0, w0, x7
+ crc32\c\()x w0, w0, x8
+ crc32\c\()x w0, w0, x9
+ crc32\c\()x w0, w0, x10
+
+ b.ne 0b
+ ret
+
+32: tbz x2, #5, 16f
+ ldp x3, x4, [x1], #16
+ ldp x5, x6, [x1], #16
+CPU_BE( rev x3, x3 )
+CPU_BE( rev x4, x4 )
+CPU_BE( rev x5, x5 )
+CPU_BE( rev x6, x6 )
+ crc32\c\()x w0, w0, x3
+ crc32\c\()x w0, w0, x4
+ crc32\c\()x w0, w0, x5
+ crc32\c\()x w0, w0, x6
+
+16: tbz x2, #4, 8f
ldp x3, x4, [x1], #16
CPU_BE( rev x3, x3 )
CPU_BE( rev x4, x4 )
crc32\c\()x w0, w0, x3
crc32\c\()x w0, w0, x4
- b.ne 0b
- ret

8: tbz x2, #3, 4f
ldr x3, [x1], #8
--
1.8.3.1
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