Source code
Revision control
Copy as Markdown
Other Tools
// Copyright 2014 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// NEON common code.
#ifndef WEBP_DSP_NEON_H_
#define WEBP_DSP_NEON_H_
#include "src/dsp/dsp.h"
#if defined(WEBP_USE_NEON)
#include <arm_neon.h>
// Right now, some intrinsics functions seem slower, so we disable them
// everywhere except newer clang/gcc or aarch64 where the inline assembly is
// incompatible.
#if LOCAL_CLANG_PREREQ(3, 8) || LOCAL_GCC_PREREQ(4, 9) || WEBP_AARCH64
#define WEBP_USE_INTRINSICS // use intrinsics when possible
#endif
#define INIT_VECTOR2(v, a, b) do { \
v.val[0] = a; \
v.val[1] = b; \
} while (0)
#define INIT_VECTOR3(v, a, b, c) do { \
v.val[0] = a; \
v.val[1] = b; \
v.val[2] = c; \
} while (0)
#define INIT_VECTOR4(v, a, b, c, d) do { \
v.val[0] = a; \
v.val[1] = b; \
v.val[2] = c; \
v.val[3] = d; \
} while (0)
// if using intrinsics, this flag avoids some functions that make gcc-4.6.3
// crash ("internal compiler error: in immed_double_const, at emit-rtl.").
// (probably similar to gcc.gnu.org/bugzilla/show_bug.cgi?id=48183)
#if !(LOCAL_CLANG_PREREQ(3, 8) || LOCAL_GCC_PREREQ(4, 8) || WEBP_AARCH64)
#define WORK_AROUND_GCC
#endif
static WEBP_INLINE int32x4x4_t Transpose4x4_NEON(const int32x4x4_t rows) {
uint64x2x2_t row01, row23;
row01.val[0] = vreinterpretq_u64_s32(rows.val[0]);
row01.val[1] = vreinterpretq_u64_s32(rows.val[1]);
row23.val[0] = vreinterpretq_u64_s32(rows.val[2]);
row23.val[1] = vreinterpretq_u64_s32(rows.val[3]);
// Transpose 64-bit values (there's no vswp equivalent)
{
const uint64x1_t row0h = vget_high_u64(row01.val[0]);
const uint64x1_t row2l = vget_low_u64(row23.val[0]);
const uint64x1_t row1h = vget_high_u64(row01.val[1]);
const uint64x1_t row3l = vget_low_u64(row23.val[1]);
row01.val[0] = vcombine_u64(vget_low_u64(row01.val[0]), row2l);
row23.val[0] = vcombine_u64(row0h, vget_high_u64(row23.val[0]));
row01.val[1] = vcombine_u64(vget_low_u64(row01.val[1]), row3l);
row23.val[1] = vcombine_u64(row1h, vget_high_u64(row23.val[1]));
}
{
const int32x4x2_t out01 = vtrnq_s32(vreinterpretq_s32_u64(row01.val[0]),
vreinterpretq_s32_u64(row01.val[1]));
const int32x4x2_t out23 = vtrnq_s32(vreinterpretq_s32_u64(row23.val[0]),
vreinterpretq_s32_u64(row23.val[1]));
int32x4x4_t out;
out.val[0] = out01.val[0];
out.val[1] = out01.val[1];
out.val[2] = out23.val[0];
out.val[3] = out23.val[1];
return out;
}
}
#if 0 // Useful debug macro.
#include <stdio.h>
#define PRINT_REG(REG, SIZE) do { \
int i; \
printf("%s \t[%d]: 0x", #REG, SIZE); \
if (SIZE == 8) { \
uint8_t _tmp[8]; \
vst1_u8(_tmp, (REG)); \
for (i = 0; i < 8; ++i) printf("%.2x ", _tmp[i]); \
} else if (SIZE == 16) { \
uint16_t _tmp[4]; \
vst1_u16(_tmp, (REG)); \
for (i = 0; i < 4; ++i) printf("%.4x ", _tmp[i]); \
} \
printf("\n"); \
} while (0)
#endif
#endif // WEBP_USE_NEON
#endif // WEBP_DSP_NEON_H_