aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm64/lib/crc32.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/lib/crc32.S')
-rw-r--r--arch/arm64/lib/crc32.S54
1 files changed, 49 insertions, 5 deletions
diff --git a/arch/arm64/lib/crc32.S b/arch/arm64/lib/crc32.S
index 5bc1e85b4e1c..f132f2a7522e 100644
--- a/arch/arm64/lib/crc32.S
+++ b/arch/arm64/lib/crc32.S
@@ -15,15 +15,59 @@
.cpu generic+crc
.macro __crc32, c
-0: subs x2, x2, #16
- b.mi 8f
- ldp x3, x4, [x1], #16
+ cmp x2, #16
+ b.lt 8f // less than 16 bytes
+
+ and x7, x2, #0x1f
+ and x2, x2, #~0x1f
+ cbz x7, 32f // multiple of 32 bytes
+
+ and x8, x7, #0xf
+ ldp x3, x4, [x1]
+ add x8, x8, x1
+ add x1, x1, x7
+ ldp x5, x6, [x8]
CPU_BE( rev x3, x3 )
CPU_BE( rev x4, x4 )
+CPU_BE( rev x5, x5 )
+CPU_BE( rev x6, x6 )
+
+ tst x7, #8
+ crc32\c\()x w8, w0, x3
+ csel x3, x3, x4, eq
+ csel w0, w0, w8, eq
+ tst x7, #4
+ lsr x4, x3, #32
+ crc32\c\()w w8, w0, w3
+ csel x3, x3, x4, eq
+ csel w0, w0, w8, eq
+ tst x7, #2
+ lsr w4, w3, #16
+ crc32\c\()h w8, w0, w3
+ csel w3, w3, w4, eq
+ csel w0, w0, w8, eq
+ tst x7, #1
+ crc32\c\()b w8, w0, w3
+ csel w0, w0, w8, eq
+ tst x7, #16
+ crc32\c\()x w8, w0, x5
+ crc32\c\()x w8, w8, x6
+ csel w0, w0, w8, eq
+ cbz x2, 0f
+
+32: ldp x3, x4, [x1], #32
+ sub x2, x2, #32
+ 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
- b.ne 0b
- ret
+ crc32\c\()x w0, w0, x5
+ crc32\c\()x w0, w0, x6
+ cbnz x2, 32b
+0: ret
8: tbz x2, #3, 4f
ldr x3, [x1], #8