| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "media/base/vector_math.h" |
| #include "media/base/vector_math_testing.h" |
| |
| #include "base/cpu.h" |
| #include "base/logging.h" |
| #include "build/build_config.h" |
| |
| #if defined(ARCH_CPU_ARM_FAMILY) && defined(USE_NEON) |
| #include <arm_neon.h> |
| #endif |
| |
| namespace media { |
| namespace vector_math { |
| |
| // If we know the minimum architecture at compile time, avoid CPU detection. |
| // Force NaCl code to use C routines since (at present) nothing there uses these |
| // methods and plumbing the -msse built library is non-trivial. iOS lies about |
| // its architecture, so we also need to exclude it here. |
| #if defined(ARCH_CPU_X86_FAMILY) && !defined(OS_NACL) && !defined(OS_IOS) |
| #if defined(__SSE__) |
| #define FMAC_FUNC FMAC_SSE |
| #define FMUL_FUNC FMUL_SSE |
| void Initialize() {} |
| #else |
| // X86 CPU detection required. Functions will be set by Initialize(). |
| // TODO(dalecurtis): Once Chrome moves to an SSE baseline this can be removed. |
| #define FMAC_FUNC g_fmac_proc_ |
| #define FMUL_FUNC g_fmul_proc_ |
| |
| typedef void (*MathProc)(const float src[], float scale, int len, float dest[]); |
| static MathProc g_fmac_proc_ = NULL; |
| static MathProc g_fmul_proc_ = NULL; |
| |
| void Initialize() { |
| CHECK(!g_fmac_proc_); |
| CHECK(!g_fmul_proc_); |
| const bool kUseSSE = base::CPU().has_sse(); |
| g_fmac_proc_ = kUseSSE ? FMAC_SSE : FMAC_C; |
| g_fmul_proc_ = kUseSSE ? FMUL_SSE : FMUL_C; |
| } |
| #endif |
| #elif defined(ARCH_CPU_ARM_FAMILY) && defined(USE_NEON) |
| #define FMAC_FUNC FMAC_NEON |
| #define FMUL_FUNC FMUL_NEON |
| void Initialize() {} |
| #else |
| // Unknown architecture. |
| #define FMAC_FUNC FMAC_C |
| #define FMUL_FUNC FMUL_C |
| void Initialize() {} |
| #endif |
| |
| void FMAC(const float src[], float scale, int len, float dest[]) { |
| // Ensure |src| and |dest| are 16-byte aligned. |
| DCHECK_EQ(0u, reinterpret_cast<uintptr_t>(src) & (kRequiredAlignment - 1)); |
| DCHECK_EQ(0u, reinterpret_cast<uintptr_t>(dest) & (kRequiredAlignment - 1)); |
| return FMAC_FUNC(src, scale, len, dest); |
| } |
| |
| void FMAC_C(const float src[], float scale, int len, float dest[]) { |
| for (int i = 0; i < len; ++i) |
| dest[i] += src[i] * scale; |
| } |
| |
| void FMUL(const float src[], float scale, int len, float dest[]) { |
| // Ensure |src| and |dest| are 16-byte aligned. |
| DCHECK_EQ(0u, reinterpret_cast<uintptr_t>(src) & (kRequiredAlignment - 1)); |
| DCHECK_EQ(0u, reinterpret_cast<uintptr_t>(dest) & (kRequiredAlignment - 1)); |
| return FMUL_FUNC(src, scale, len, dest); |
| } |
| |
| void FMUL_C(const float src[], float scale, int len, float dest[]) { |
| for (int i = 0; i < len; ++i) |
| dest[i] = src[i] * scale; |
| } |
| |
| #if defined(ARCH_CPU_ARM_FAMILY) && defined(USE_NEON) |
| void FMAC_NEON(const float src[], float scale, int len, float dest[]) { |
| const int rem = len % 4; |
| const int last_index = len - rem; |
| float32x4_t m_scale = vmovq_n_f32(scale); |
| for (int i = 0; i < last_index; i += 4) { |
| vst1q_f32(dest + i, vmlaq_f32( |
| vld1q_f32(dest + i), vld1q_f32(src + i), m_scale)); |
| } |
| |
| // Handle any remaining values that wouldn't fit in an NEON pass. |
| for (int i = last_index; i < len; ++i) |
| dest[i] += src[i] * scale; |
| } |
| |
| void FMUL_NEON(const float src[], float scale, int len, float dest[]) { |
| const int rem = len % 4; |
| const int last_index = len - rem; |
| float32x4_t m_scale = vmovq_n_f32(scale); |
| for (int i = 0; i < last_index; i += 4) |
| vst1q_f32(dest + i, vmulq_f32(vld1q_f32(src + i), m_scale)); |
| |
| // Handle any remaining values that wouldn't fit in an NEON pass. |
| for (int i = last_index; i < len; ++i) |
| dest[i] = src[i] * scale; |
| } |
| #endif |
| |
| } // namespace vector_math |
| } // namespace media |