[FFmpeg-devel] [PATCH v2 5/5] aarch64: Add Windows runtime detection of the dotprod instructions

From: "Martin Storsjö" <martin@martin.st>
To: ffmpeg-devel@ffmpeg.org
Subject: [FFmpeg-devel] [PATCH v2 5/5] aarch64: Add Windows runtime detection of the dotprod instructions
Date: Tue, 30 May 2023 15:30:43 +0300
Message-ID: <20230530123043.52940-5-martin@martin.st> (raw)
In-Reply-To: <20230530123043.52940-1-martin@martin.st>

For Windows, there's no publicly defined constant for checking for
the i8mm extension yet.
---
 libavutil/aarch64/cpu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libavutil/aarch64/cpu.c b/libavutil/aarch64/cpu.c
index ffb00f6dd2..4b97530240 100644
--- a/libavutil/aarch64/cpu.c
+++ b/libavutil/aarch64/cpu.c
@@ -94,6 +94,16 @@ static int detect_flags(void)
     return flags;
 }
 
+#elif defined(_WIN32)
+#include <windows.h>
+
+static int detect_flags(void)
+{
+    int flags = 0;
+    if (IsProcessorFeaturePresent(PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE))
+        flags |= AV_CPU_FLAG_DOTPROD;
+    return flags;
+}
 #else
 
 static int detect_flags(void)
-- 
2.37.1 (Apple Git-137.1)

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