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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.
 */
/*
  Copyright (c) 2005 Eliot Dresselhaus

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#ifndef included_vector_sse2_h
#define included_vector_sse2_h

#include <vppinfra/error_bootstrap.h>	/* for ASSERT */
#include <x86intrin.h>

/* *INDENT-OFF* */
#define foreach_sse42_vec128i \
  _(i,8,16,epi8) _(i,16,8,epi16) _(i,32,4,epi32)  _(i,64,2,epi64x)
#define foreach_sse42_vec128u \
  _(u,8,16,epi8) _(u,16,8,epi16) _(u,32,4,epi32)  _(u,64,2,epi64x)
#define foreach_sse42_vec128f \
  _(f,32,4,ps) _(f,64,2,pd)

/* splat, load_unaligned, store_unaligned, is_all_zero, is_equal,
   is_all_equal */
#define _(t, s, c, i) \
static_always_inline t##s##x##c						\
t##s##x##c##_splat (t##s x)						\
{ return (t##s##x##c) _mm_set1_##i (x); }				\
\
static_always_inline t##s##x##c						\
t##s##x##c##_load_unaligned (void *p)					\
{ return (t##s##x##c) _mm_loadu_si128 (p); }				\
\
static_always_inline void						\
t##s##x##c##_store_unaligned (t##s##x##c v, void *p)			\
{ _mm_storeu_si128 ((__m128i *) p, (__m128i) v); }			\
\
static_always_inline int						\
t##s##x##c##_is_all_zero (t##s##x##c x)					\
{ return _mm_testz_si128 ((__m128i) x, (__m128i) x); }			\
\
static_always_inline int						\
t##s##x##c##_is_equal (t##s##x##c a, t##s##x##c b)			\
{ return t##s##x##c##_is_all_zero (a ^ b); }				\
\
static_always_inline int						\
t##s##x##c##_is_all_equal (t##s##x##c v, t##s x)			\
{ return t##s##x##c##_is_equal (v, t##s##x##c##_splat (x)); };		\

foreach_sse42_vec128i foreach_sse42_vec128u
#undef _

/* min, max */
#define _(t, s, c, i) \
static_always_inline t##s##x##c						\
t##s##x##c##_min (t##s##x##c a, t##s##x##c b)				\
{ return (t##s##x##c) _mm_min_##i ((__m128i) a, (__m128i) b); }		\
\
static_always_inline t##s##x##c						\
t##s##x##c##_max (t##s##x##c a, t##s##x##c b)				\
{ return (t##s##x##c) _mm_max_##i ((__m128i) a, (__m128i) b); }		\

_(i,8,16,epi8) _(i,16,8,epi16) _(i,32,4,epi32)  _(i,64,2,epi64)
_(u,8,16,epu8) _(u,16,8,epu16) _(u,32,4,epu32)  _(u,64,2,epu64)
#undef _
/* *INDENT-ON* */

#define CLIB_VEC128_SPLAT_DEFINED
#define CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE

/* 128 bit interleaves. */
always_inline u8x16
u8x16_interleave_hi (u8x16 a, u8x16 b)
{
  return (u8x16) _mm_unpackhi_epi8 ((__m128i) a, (__m128i) b);
}

always_inline u8x16
u8x16_interleave_lo (u8x16 a, u8x16 b)
{
  return (u8x16) _mm_unpacklo_epi8 ((__m128i) a, (__m128i) b);
}

always_inline u16x8
u16x8_interleave_hi (u16x8 a, u16x8 b)
{
  return (u16x8) _mm_unpackhi_epi16 ((__m128i) a, (__m128i) b);
}

always_inline u16x8
u16x8_interleave_lo (u16x8 a, u16x8 b)
{
  return (u16x8) _mm_unpacklo_epi16 ((__m128i) a, (__m128i) b);
}

always_inline u32x4
u32x4_interleave_hi (u32x4 a, u32x4 b)
{
  return (u32x4) _mm_unpackhi_epi32 ((__m128i) a, (__m128i) b);
}

always_inline u32x4
u32x4_interleave_lo (u32x4 a, u32x4 b)
{
  return (u32x4) _mm_unpacklo_epi32 ((__m128i) a, (__m128i) b);
}

always_inline u64x2
u64x2_interleave_hi (u64x2 a, u64x2 b)
{
  return (u64x2) _mm_unpackhi_epi64 ((__m128i) a, (__m128i) b);
}

always_inline u64x2
u64x2_interleave_lo (u64x2 a, u64x2 b)
{
  return (u64x2) _mm_unpacklo_epi64 ((__m128i) a, (__m128i) b);
}

/* 128 bit packs. */
#define _(f, t, fn)                                                           \
  always_inline t t##_pack (f lo, f hi)                                       \
  {                                                                           \
    return (t) fn ((__m128i) lo, (__m128i) hi);                               \
  }

_ (i16x8, i8x16, _mm_packs_epi16)
_ (i16x8, u8x16, _mm_packus_epi16)
_ (i32x4, i16x8, _mm_packs_epi32)
_ (i32x4, u16x8, _mm_packus_epi32)

#undef _

#define _signed_binop(n,m,f,g)                                         \
  /* Unsigned */                                                       \
  always_inline u##n##x##m                                             \
  u##n##x##m##_##f (u##n##x##m x, u##n##x##m y)                        \
  { return (u##n##x##m) _mm_##g##n ((__m128i) x, (__m128i) y); } \
                                                                       \
  /* Signed */                                                         \
  always_inline i##n##x##m                                             \
  i##n##x##m##_##f (i##n##x##m x, i##n##x##m y)                        \
  { return (i##n##x##m) _mm_##g##n ((__m128i) x, (__m128i) y); }
/* Addition/subtraction with saturation. */
_signed_binop (8, 16, add_saturate, adds_epu)
_signed_binop (16, 8, add_saturate, adds_epu)
_signed_binop (8, 16, sub_saturate, subs_epu)
_signed_binop (16, 8, sub_saturate, subs_epu)
/* Multiplication. */
     always_inline i16x8 i16x8_mul_lo (i16x8 x, i16x8 y)
{
  return (i16x8) _mm_mullo_epi16 ((__m128i) x, (__m128i) y);
}

always_inline u16x8
u16x8_mul_lo (u16x8 x, u16x8 y)
{
  return (u16x8) _mm_mullo_epi16 ((__m128i) x, (__m128i) y);
}

always_inline i16x8
i16x8_mul_hi (i16x8 x, i16x8 y)
{
  return (i16x8) _mm_mulhi_epu16 ((__m128i) x, (__m128i) y);
}

always_inline u16x8
u16x8_mul_hi (u16x8 x, u16x8 y)
{
  return (u16x8) _mm_mulhi_epu16 ((__m128i) x, (__m128i) y);
}

/* 128 bit shifts. */

#define _(p,a,b,c,f)           \
  always_inline p##a##x##b p##a##x##b##_ishift_##c (p##a##x##b x, int i)       \
  { return (p##a##x##b) _mm_##f##i_epi##a ((__m128i) x, i); }                  \
                                                                               \
  always_inline p##a##x##b p##a##x##b##_shift_##c (p##a##x##b x, p##a##x##b y) \
  { return (p##a##x##b) _mm_##f##_epi##a ((__m128i) x, (__m128i) y); }

_(u, 16, 8, left, sll)
_(u, 32, 4, left, sll)
_(u, 64, 2, left, sll)
_(u, 16, 8, right, srl)
_(u, 32, 4, right, srl)
_(u, 64, 2, right, srl)
_(i, 16, 8, left, sll)
_(i, 32, 4, left, sll)
_(i, 64, 2, left, sll) _(i, 16, 8, right, sra) _(i, 32, 4, right, sra)
#undef _

#define u8x16_word_shift_left(a,n)  (u8x16) _mm_slli_si128((__m128i) a, n)
#define u8x16_word_shift_right(a,n) (u8x16) _mm_srli_si128((__m128i) a, n)

#define i8x16_word_shift_left(a,n) \
  ((i8x16) u8x16_word_shift_left((u8x16) (a), (n)))
#define i8x16_word_shift_right(a,n) \
  ((i8x16) u8x16_word_shift_right((u8x16) (a), (n)))

#define u16x8_word_shift_left(a,n) \
  ((u16x8) u8x16_word_shift_left((u8x16) (a), (n) * sizeof (u16)))
#define i16x8_word_shift_left(a,n) \
  ((u16x8) u8x16_word_shift_left((u8x16) (a), (n) * sizeof (u16)))
#define u16x8_word_shift_right(a,n) \
  ((u16x8) u8x16_word_shift_right((u8x16) (a), (n) * sizeof (u16)))
#define i16x8_word_shift_right(a,n) \
  ((i16x8) u8x16_word_shift_right((u8x16) (a), (n) * sizeof (u16)))

#define u32x4_word_shift_left(a,n) \
  ((u32x4) u8x16_word_shift_left((u8x16) (a), (n) * sizeof (u32)))
#define i32x4_word_shift_left(a,n) \
  ((u32x4) u8x16_word_shift_left((u8x16) (a), (n) * sizeof (u32)))
#define u32x4_word_shift_right(a,n) \
  ((u32x4) u8x16_word_shift_right((u8x16) (a), (n) * sizeof (u32)))
#define i32x4_word_shift_right(a,n) \
  ((i32x4) u8x16_word_shift_right((u8x16) (a), (n) * sizeof (u32)))

#define u64x2_word_shift_left(a,n) \
  ((u64x2) u8x16_word_shift_left((u8x16) (a), (n) * sizeof (u64)))
#define i64x2_word_shift_left(a,n) \
  ((u64x2) u8x16_word_shift_left((u8x16) (a), (n) * sizeof (u64)))
#define u64x2_word_shift_right(a,n) \
  ((u64x2) u8x16_word_shift_right((u8x16) (a), (n) * sizeof (u64)))
#define i64x2_word_shift_right(a,n) \
  ((i64x2) u8x16_word_shift_right((u8x16) (a), (n) * sizeof (u64)))

/* SSE2 has no rotate instructions: use shifts to simulate them. */
#define _(t,n,lr1,lr2)					\
  always_inline t##x##n					\
  t##x##n##_irotate_##lr1 (t##x##n w, int i)		\
  {							\
    ASSERT (i >= 0 && i <= BITS (t));			\
    return (t##x##n##_ishift_##lr1 (w, i)		\
	    | t##x##n##_ishift_##lr2 (w, BITS (t) - i)); \
  }							\
							\
  always_inline t##x##n					\
  t##x##n##_rotate_##lr1 (t##x##n w, t##x##n i)		\
  {							\
    t##x##n j = t##x##n##_splat (BITS (t));		\
    return (t##x##n##_shift_##lr1 (w, i)		\
	    | t##x##n##_shift_##lr2 (w, j - i));	\
  }

_(u16, 8, left, right);
_(u16, 8, right, left);
_(u32, 4, left, right);
_(u32, 4, right, left);
_(u64, 2, left, right);
_(u64, 2, right, left);

#undef _

always_inline u32
u8x16_max_scalar (u8x16 x)
{
  x = u8x16_max (x, u8x16_word_shift_right (x, 8));
  x = u8x16_max (x, u8x16_word_shift_right (x, 4));
  x = u8x16_max (x, u8x16_word_shift_right (x, 2));
  x = u8x16_max (x, u8x16_word_shift_right (x, 1));
  return _mm_extract_epi16 ((__m128i) x, 0) & 0xff;
}

always_inline u8
u8x16_min_scalar (u8x16 x)
{
  x = u8x16_min (x, u8x16_word_shift_right (x, 8));
  x = u8x16_min (x, u8x16_word_shift_right (x, 4));
  x = u8x16_min (x, u8x16_word_shift_right (x, 2));
  x = u8x16_min (x, u8x16_word_shift_right (x, 1));
  return _mm_extract_epi16 ((__m128i) x, 0) & 0xff;
}

always_inline i16
i16x8_max_scalar (i16x8 x)
{
  x = i16x8_max (x, i16x8_word_shift_right (x, 4));
  x = i16x8_max (x, i16x8_word_shift_right (x, 2));
  x = i16x8_max (x, i16x8_word_shift_right (x, 1));
  return _mm_extract_epi16 ((__m128i) x, 0);
}

always_inline i16
i16x8_min_scalar (i16x8 x)
{
  x = i16x8_min (x, i16x8_word_shift_right (x, 4));
  x = i16x8_min (x, i16x8_word_shift_right (x, 2));
  x = i16x8_min (x, i16x8_word_shift_right (x, 1));
  return _mm_extract_epi16 ((__m128i) x, 0);
}

#define u8x16_align_right(a, b, imm) \
  (u8x16) _mm_alignr_epi8 ((__m128i) a, (__m128i) b, imm)

static_always_inline u32
u32x4_min_scalar (u32x4 v)
{
  v = u32x4_min (v, (u32x4) u8x16_align_right ((u8x16) v, (u8x16) v, 8));
  v = u32x4_min (v, (u32x4) u8x16_align_right ((u8x16) v, (u8x16) v, 4));
  return v[0];
}

static_always_inline u32
u32x4_max_scalar (u32x4 v)
{
  v = u32x4_max (v, (u32x4) u8x16_align_right ((u8x16) v, (u8x16) v, 8));
  v = u32x4_max (v, (u32x4) u8x16_align_right ((u8x16) v, (u8x16) v, 4));
  return v[0];
}

static_always_inline u32
i32x4_min_scalar (i32x4 v)
{
  v = i32x4_min (v, (i32x4) u8x16_align_right ((u8x16) v, (u8x16) v, 8));
  v = i32x4_min (v, (i32x4) u8x16_align_right ((u8x16) v, (u8x16) v, 4));
  return v[0];
}

static_always_inline u32
i32x4_max_scalar (i32x4 v)
{
  v = i32x4_max (v, (i32x4) u8x16_align_right ((u8x16) v, (u8x16) v, 8));
  v = i32x4_max (v, (i32x4) u8x16_align_right ((u8x16) v, (u8x16) v, 4));
  return v[0];
}

static_always_inline u16
u8x16_msb_mask (u8x16 v)
{
  return _mm_movemask_epi8 ((__m128i) v);
}

static_always_inline u16
i8x16_msb_mask (i8x16 v)
{
  return _mm_movemask_epi8 ((__m128i) v);
}

#define CLIB_HAVE_VEC128_MSB_MASK

#undef _signed_binop

static_always_inline u32x4
u32x4_byte_swap (u32x4 v)
{
  u8x16 swap = {
    3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12
  };
  return (u32x4) _mm_shuffle_epi8 ((__m128i) v, (__m128i) swap);
}

static_always_inline u16x8
u16x8_byte_swap (u16x8 v)
{
  u8x16 swap = {
    1, 0, 3, 2, 5, 4, 7, 6, 9, 8, 11, 10, 13, 12, 15, 14,
  };
  return (u16x8) _mm_shuffle_epi8 ((__m128i) v, (__m128i) swap);
}

static_always_inline u8x16
u8x16_reflect (u8x16 v)
{
  u8x16 mask = {
    15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
  };
  return (u8x16) _mm_shuffle_epi8 ((__m128i) v, (__m128i) mask);
}

static_always_inline u32x4
u32x4_hadd (u32x4 v1, u32x4 v2)
{
  return (u32x4) _mm_hadd_epi32 ((__m128i) v1, (__m128i) v2);
}

static_always_inline u32 __clib_unused
u32x4_sum_elts (u32x4 sum4)
{
  sum4 += (u32x4) u8x16_align_right (sum4, sum4, 8);
  sum4 += (u32x4) u8x16_align_right (sum4, sum4, 4);
  return sum4[0];
}

/* _from_ */
/* *INDENT-OFF* */
#define _(f,t,i) \
static_always_inline t							\
t##_from_##f (f x)							\
{ return (t) _mm_cvt##i ((__m128i) x); }

_(u8x16, u16x8, epu8_epi16)
_(u8x16, u32x4, epu8_epi32)
_(u8x16, u64x2, epu8_epi64)
_(u16x8, u32x4, epu16_epi32)
_(u16x8, u64x2, epu16_epi64)
_(u32x4, u64x2, epu32_epi64)

_(i8x16, i16x8, epi8_epi16)
_(i8x16, i32x4, epi8_epi32)
_(i8x16, i64x2, epi8_epi64)
_(i16x8, i32x4, epi16_epi32)
_(i16x8, i64x2, epi16_epi64)
_(i32x4, i64x2, epi32_epi64)
#undef _
/* *INDENT-ON* */

static_always_inline u64x2
u64x2_gather (void *p0, void *p1)
{
  u64x2 r = { *(u64 *) p0, *(u64 *) p1 };
  return r;
}

static_always_inline u32x4
u32x4_gather (void *p0, void *p1, void *p2, void *p3)
{
  u32x4 r = { *(u32 *) p0, *(u32 *) p1, *(u32 *) p2, *(u32 *) p3 };
  return r;
}


static_always_inline void
u64x2_scatter (u64x2 r, void *p0, void *p1)
{
  *(u64 *) p0 = r[0];
  *(u64 *) p1 = r[1];
}

static_always_inline void
u32x4_scatter (u32x4 r, void *p0, void *p1, void *p2, void *p3)
{
  *(u32 *) p0 = r[0];
  *(u32 *) p1 = r[1];
  *(u32 *) p2 = r[2];
  *(u32 *) p3 = r[3];
}

static_always_inline void
u64x2_scatter_one (u64x2 r, int index, void *p)
{
  *(u64 *) p = r[index];
}

static_always_inline void
u32x4_scatter_one (u32x4 r, int index, void *p)
{
  *(u32 *) p = r[index];
}

static_always_inline u8x16
u8x16_is_greater (u8x16 v1, u8x16 v2)
{
  return (u8x16) _mm_cmpgt_epi8 ((__m128i) v1, (__m128i) v2);
}

static_always_inline u8x16
u8x16_blend (u8x16 v1, u8x16 v2, u8x16 mask)
{
  return (u8x16) _mm_blendv_epi8 ((__m128i) v1, (__m128i) v2, (__m128i) mask);
}

static_always_inline u8x16
u8x16_xor3 (u8x16 a, u8x16 b, u8x16 c)
{
#if __AVX512F__
  return (u8x16) _mm_ternarylogic_epi32 ((__m128i) a, (__m128i) b,
					 (__m128i) c, 0x96);
#endif
  return a ^ b ^ c;
}

#endif /* included_vector_sse2_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */