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[81.164.68.24]) by smtp.gmail.com with ESMTPSA id c5sm12176842edd.38.2017.10.30.06.08.41 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Oct 2017 06:08:41 -0700 (PDT) From: James Darnley To: ffmpeg-devel@ffmpeg.org Date: Mon, 30 Oct 2017 14:08:30 +0100 Message-Id: <20171030130835.28327-4-jdarnley@obe.tv> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171030130835.28327-1-jdarnley@obe.tv> References: <20171030130835.28327-1-jdarnley@obe.tv> Subject: [FFmpeg-devel] [PATCH 3/8] avutil: detect when AVX-512 is available X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" --- libavutil/x86/cpu.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/libavutil/x86/cpu.c b/libavutil/x86/cpu.c index f33088c8c7..b22a950b79 100644 --- a/libavutil/x86/cpu.c +++ b/libavutil/x86/cpu.c @@ -143,6 +143,7 @@ int ff_get_cpu_flags_x86(void) #endif /* HAVE_SSE */ } if (max_std_level >= 7) { + int xcr0_lo = 0, xcr0_hi = 0; cpuid(7, eax, ebx, ecx, edx); #if HAVE_AVX2 if ((rval & AV_CPU_FLAG_AVX) && (ebx & 0x00000020)) @@ -154,6 +155,14 @@ int ff_get_cpu_flags_x86(void) if (ebx & 0x00000100) rval |= AV_CPU_FLAG_BMI2; } +#if HAVE_AVX512 /* F, CD, BW, DQ, VL */ + xgetbv(0, xcr0_lo, xcr0_hi); + if ((xcr0_lo & 0xe6) == 0xe6) { + if ((ebx & 0xd0030000) == 0xd0030000) + rval |= AV_CPU_FLAG_AVX512; + + } +#endif } cpuid(0x80000000, max_ext_level, ebx, ecx, edx);