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/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef included_vector_neon_h
#define included_vector_neon_h
#include <arm_neon.h>
/* Arithmetic */
#define u16x8_sub_saturate(a,b) vsubq_u16(a,b)
#define i16x8_sub_saturate(a,b) vsubq_s16(a,b)
always_inline int
u8x16_is_all_zero (u8x16 x)
{
return !(vaddvq_u8 (x));
}
always_inline int
u16x8_is_all_zero (u16x8 x)
{
return !(vaddvq_u16 (x));
}
always_inline int
u32x4_is_all_zero (u32x4 x)
{
return !(vaddvq_u32 (x));
}
always_inline int
u64x2_is_all_zero (u64x2 x)
{
return !(vaddvq_u64 (x));
}
/* Converts all ones/zeros compare mask to bitmap. */
always_inline u32
u8x16_compare_byte_mask (u8x16 x)
{
uint8x16_t mask_shift =
{ -7, -6, -5, -4, -3, -2, -1, 0, -7, -6, -5, -4, -3, -2, -1, 0 };
uint8x16_t mask_and = vdupq_n_u8 (0x80);
x = vandq_u8 (x, mask_and);
x = vshlq_u8 (x, vreinterpretq_s8_u8 (mask_shift));
x = vpaddq_u8 (x, x);
x = vpaddq_u8 (x, x);
x = vpaddq_u8 (x, x);
return vgetq_lane_u8 (x, 0) | (vgetq_lane_u8 (x, 1) << 8);
}
always_inline u32
u16x8_zero_byte_mask (u16x8 input)
{
u8x16 vall_one = vdupq_n_u8 (0x0);
u8x16 res_values = { 0x01, 0x02, 0x04, 0x08,
0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x04, 0x08,
0x10, 0x20, 0x40, 0x80
};
/* input --> [0x80, 0x40, 0x01, 0xf0, ... ] */
u8x16 test_result =
vreinterpretq_u8_u16 (vceqq_u16 (input, vreinterpretq_u16_u8 (vall_one)));
u8x16 before_merge = vminq_u8 (test_result, res_values);
/*before_merge--> [0x80, 0x00, 0x00, 0x10, ... ] */
/* u8x16 --> [a,b,c,d, e,f,g,h, i,j,k,l, m,n,o,p] */
/* pair add until we have 2 uint64_t */
u16x8 merge1 = vpaddlq_u8 (before_merge);
/* u16x8--> [a+b,c+d, e+f,g+h, i+j,k+l, m+n,o+p] */
u32x4 merge2 = vpaddlq_u16 (merge1);
/* u32x4--> [a+b+c+d, e+f+g+h, i+j+k+l, m+n+o+p] */
u64x2 merge3 = vpaddlq_u32 (merge2);
/* u64x2--> [a+b+c+d+e+f+g+h, i+j+k+l+m+n+o+p] */
return (u32) (vgetq_lane_u64 (merge3, 1) << 8) + vgetq_lane_u64 (merge3, 0);
}
always_inline u32
u8x16_zero_byte_mask (u8x16 input)
{
return u16x8_zero_byte_mask ((u16x8) input);
}
always_inline u32
u32x4_zero_byte_mask (u32x4 input)
{
return u16x8_zero_byte_mask ((u16x8) input);
}
always_inline u32
u64x2_zero_byte_mask (u64x2 input)
{
return u16x8_zero_byte_mask ((u16x8) input);
}
#endif /* included_vector_neon_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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