e305d956c0
Chrome does not detect NEON instruction set at runtime in WebRTC code starting with M50, which is now in Stable. Remove support for runtime detection for simplicity. The only remaining piece of Chrome that will continue to depend on runtime detection is /net, where devices with _broken_ neon support are also detected, and it is not configurable via GYP/GN. BUG=522035 NOPRESUBMIT=true Review-Url: https://codereview.webrtc.org/1955413003 Cr-Commit-Position: refs/heads/master@{#12778}
134 lines
4.5 KiB
C
134 lines
4.5 KiB
C
/*
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* Copyright (c) 2012 The WebRTC project authors. 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 LICENSE 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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/* The global function contained in this file initializes SPL function
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* pointers, currently only for ARM platforms.
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*
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* Some code came from common/rtcd.c in the WebM project.
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*/
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#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
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#include "webrtc/system_wrappers/include/cpu_features_wrapper.h"
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/* Declare function pointers. */
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MaxAbsValueW16 WebRtcSpl_MaxAbsValueW16;
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MaxAbsValueW32 WebRtcSpl_MaxAbsValueW32;
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MaxValueW16 WebRtcSpl_MaxValueW16;
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MaxValueW32 WebRtcSpl_MaxValueW32;
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MinValueW16 WebRtcSpl_MinValueW16;
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MinValueW32 WebRtcSpl_MinValueW32;
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CrossCorrelation WebRtcSpl_CrossCorrelation;
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DownsampleFast WebRtcSpl_DownsampleFast;
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ScaleAndAddVectorsWithRound WebRtcSpl_ScaleAndAddVectorsWithRound;
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#if (!defined(WEBRTC_HAS_NEON)) && !defined(MIPS32_LE)
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/* Initialize function pointers to the generic C version. */
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static void InitPointersToC() {
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WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16C;
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WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32C;
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WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16C;
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WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32C;
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WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16C;
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WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32C;
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WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelationC;
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WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFastC;
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WebRtcSpl_ScaleAndAddVectorsWithRound =
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WebRtcSpl_ScaleAndAddVectorsWithRoundC;
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}
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#endif
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#if defined(WEBRTC_HAS_NEON)
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/* Initialize function pointers to the Neon version. */
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static void InitPointersToNeon() {
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WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16Neon;
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WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32Neon;
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WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16Neon;
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WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32Neon;
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WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16Neon;
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WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32Neon;
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WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelationNeon;
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WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFastNeon;
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WebRtcSpl_ScaleAndAddVectorsWithRound =
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WebRtcSpl_ScaleAndAddVectorsWithRoundC;
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}
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#endif
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#if defined(MIPS32_LE)
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/* Initialize function pointers to the MIPS version. */
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static void InitPointersToMIPS() {
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WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16_mips;
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WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16_mips;
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WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32_mips;
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WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16_mips;
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WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32_mips;
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WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelation_mips;
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WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFast_mips;
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#if defined(MIPS_DSP_R1_LE)
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WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32_mips;
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WebRtcSpl_ScaleAndAddVectorsWithRound =
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WebRtcSpl_ScaleAndAddVectorsWithRound_mips;
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#else
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WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32C;
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WebRtcSpl_ScaleAndAddVectorsWithRound =
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WebRtcSpl_ScaleAndAddVectorsWithRoundC;
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#endif
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}
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#endif
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static void InitFunctionPointers(void) {
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#if defined(WEBRTC_HAS_NEON)
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InitPointersToNeon();
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#elif defined(MIPS32_LE)
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InitPointersToMIPS();
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#else
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InitPointersToC();
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#endif /* WEBRTC_HAS_NEON */
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}
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#if defined(WEBRTC_POSIX)
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#include <pthread.h>
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static void once(void (*func)(void)) {
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static pthread_once_t lock = PTHREAD_ONCE_INIT;
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pthread_once(&lock, func);
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}
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#elif defined(_WIN32)
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#include <windows.h>
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static void once(void (*func)(void)) {
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/* Didn't use InitializeCriticalSection() since there's no race-free context
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* in which to execute it.
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*
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* TODO(kma): Change to different implementation (e.g.
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* InterlockedCompareExchangePointer) to avoid issues similar to
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* http://code.google.com/p/webm/issues/detail?id=467.
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*/
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static CRITICAL_SECTION lock = {(void *)((size_t)-1), -1, 0, 0, 0, 0};
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static int done = 0;
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EnterCriticalSection(&lock);
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if (!done) {
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func();
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done = 1;
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}
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LeaveCriticalSection(&lock);
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}
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/* There's no fallback version as an #else block here to ensure thread safety.
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* In case of neither pthread for WEBRTC_POSIX nor _WIN32 is present, build
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* system should pick it up.
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*/
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#endif /* WEBRTC_POSIX */
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void WebRtcSpl_Init() {
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once(InitFunctionPointers);
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}
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