FD.io VPP  v18.01.2-1-g9b554f3
Vector Packet Processing
vector_neon.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef included_vector_neon_h
17 #define included_vector_neon_h
18 #include <arm_neon.h>
19 
20 /* Splats. */
21 
22 #define u8x16_splat(i) vdupq_n_u8(i)
23 #define u16x8_splat(i) vdupq_n_u16(i)
24 #define i16x8_splat(i) vdupq_n_s16(i)
25 #define u32x4_splat(i) vdupq_n_u32(i)
26 #define i32x4_splat(i) vdupq_n_s32(i)
27 
28 /* Arithmetic */
29 #define u16x8_add(a,b) vaddq_u16(a,b)
30 #define i16x8_add(a,b) vaddq_s16(a,b)
31 #define u16x8_sub_saturate(a,b) vsubq_u16(a,b)
32 #define i16x8_sub_saturate(a,b) vsubq_s16(a,b)
33 
34 #define u16x8_is_equal(a,b) vceqq_u16(a,b)
35 #define i16x8_is_equal(a,b) vceqq_i16(a,b)
36 
38 u16x8_zero_byte_mask (u16x8 input)
39 {
40  u8x16 vall_one = vdupq_n_u8 (0x0);
41  u8x16 res_values = { 0x01, 0x02, 0x04, 0x08,
42  0x10, 0x20, 0x40, 0x80,
43  0x01, 0x02, 0x04, 0x08,
44  0x10, 0x20, 0x40, 0x80
45  };
46 
47  /* input --> [0x80, 0x40, 0x01, 0xf0, ... ] */
48  u8x16 test_result =
49  vreinterpretq_u8_u16 (vceqq_u16 (input, vreinterpretq_u16_u8 (vall_one)));
50  u8x16 before_merge = vminq_u8 (test_result, res_values);
51  /*before_merge--> [0x80, 0x00, 0x00, 0x10, ... ] */
52  /* u8x16 --> [a,b,c,d, e,f,g,h, i,j,k,l, m,n,o,p] */
53  /* pair add until we have 2 uint64_t */
54  u16x8 merge1 = vpaddlq_u8 (before_merge);
55  /* u16x8--> [a+b,c+d, e+f,g+h, i+j,k+l, m+n,o+p] */
56  u32x4 merge2 = vpaddlq_u16 (merge1);
57  /* u32x4--> [a+b+c+d, e+f+g+h, i+j+k+l, m+n+o+p] */
58  u64x2 merge3 = vpaddlq_u32 (merge2);
59  /* u64x2--> [a+b+c+d+e+f+g+h, i+j+k+l+m+n+o+p] */
60  return (u32) (vgetq_lane_u64 (merge3, 1) << 8) + vgetq_lane_u64 (merge3, 0);
61 }
62 
63 #endif /* included_vector_neon_h */
64 
65 /*
66  * fd.io coding-style-patch-verification: ON
67  *
68  * Local Variables:
69  * eval: (c-set-style "gnu")
70  * End:
71  */
#define always_inline
Definition: clib.h:92
unsigned long long u32x4
Definition: ixge.c:28
static u32 u16x8_zero_byte_mask(u16x8 input)
Definition: vector_neon.h:38
unsigned int u32
Definition: types.h:88