102 lines
3.9 KiB
C
102 lines
3.9 KiB
C
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// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// NEON common code.
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#ifndef WEBP_DSP_NEON_H_
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#define WEBP_DSP_NEON_H_
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#include <arm_neon.h>
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#include "dsp_dsp.h"
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// Right now, some intrinsics functions seem slower, so we disable them
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// everywhere except newer clang/gcc or aarch64 where the inline assembly is
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// incompatible.
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#if LOCAL_CLANG_PREREQ(3,8) || LOCAL_GCC_PREREQ(4,9) || defined(__aarch64__)
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#define WEBP_USE_INTRINSICS // use intrinsics when possible
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#endif
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#define INIT_VECTOR2(v, a, b) do { \
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v.val[0] = a; \
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v.val[1] = b; \
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} while (0)
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#define INIT_VECTOR3(v, a, b, c) do { \
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v.val[0] = a; \
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v.val[1] = b; \
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v.val[2] = c; \
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} while (0)
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#define INIT_VECTOR4(v, a, b, c, d) do { \
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v.val[0] = a; \
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v.val[1] = b; \
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v.val[2] = c; \
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v.val[3] = d; \
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} while (0)
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// if using intrinsics, this flag avoids some functions that make gcc-4.6.3
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// crash ("internal compiler error: in immed_double_const, at emit-rtl.").
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// (probably similar to gcc.gnu.org/bugzilla/show_bug.cgi?id=48183)
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#if !(LOCAL_CLANG_PREREQ(3,8) || LOCAL_GCC_PREREQ(4,8) || defined(__aarch64__))
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#define WORK_AROUND_GCC
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#endif
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static WEBP_INLINE int32x4x4_t Transpose4x4_NEON(const int32x4x4_t rows) {
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uint64x2x2_t row01, row23;
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row01.val[0] = vreinterpretq_u64_s32(rows.val[0]);
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row01.val[1] = vreinterpretq_u64_s32(rows.val[1]);
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row23.val[0] = vreinterpretq_u64_s32(rows.val[2]);
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row23.val[1] = vreinterpretq_u64_s32(rows.val[3]);
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// Transpose 64-bit values (there's no vswp equivalent)
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{
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const uint64x1_t row0h = vget_high_u64(row01.val[0]);
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const uint64x1_t row2l = vget_low_u64(row23.val[0]);
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const uint64x1_t row1h = vget_high_u64(row01.val[1]);
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const uint64x1_t row3l = vget_low_u64(row23.val[1]);
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row01.val[0] = vcombine_u64(vget_low_u64(row01.val[0]), row2l);
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row23.val[0] = vcombine_u64(row0h, vget_high_u64(row23.val[0]));
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row01.val[1] = vcombine_u64(vget_low_u64(row01.val[1]), row3l);
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row23.val[1] = vcombine_u64(row1h, vget_high_u64(row23.val[1]));
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}
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{
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const int32x4x2_t out01 = vtrnq_s32(vreinterpretq_s32_u64(row01.val[0]),
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vreinterpretq_s32_u64(row01.val[1]));
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const int32x4x2_t out23 = vtrnq_s32(vreinterpretq_s32_u64(row23.val[0]),
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vreinterpretq_s32_u64(row23.val[1]));
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int32x4x4_t out;
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out.val[0] = out01.val[0];
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out.val[1] = out01.val[1];
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out.val[2] = out23.val[0];
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out.val[3] = out23.val[1];
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return out;
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}
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}
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#if 0 // Useful debug macro.
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#include <stdio.h>
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#define PRINT_REG(REG, SIZE) do { \
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int i; \
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printf("%s \t[%d]: 0x", #REG, SIZE); \
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if (SIZE == 8) { \
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uint8_t _tmp[8]; \
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vst1_u8(_tmp, (REG)); \
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for (i = 0; i < 8; ++i) printf("%.2x ", _tmp[i]); \
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} else if (SIZE == 16) { \
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uint16_t _tmp[4]; \
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vst1_u16(_tmp, (REG)); \
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for (i = 0; i < 4; ++i) printf("%.4x ", _tmp[i]); \
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} \
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printf("\n"); \
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} while (0)
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#endif
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#endif // WEBP_DSP_NEON_H_
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