From 570f6c70808287fc78e3f8f5372a095ec6ef7878 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Fri, 28 Feb 2025 18:22:37 +0200
Subject: [PATCH] aarch64: Add runtime detection of extensions on Windows and
macOS
---
common/cpu.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 56 insertions(+), 1 deletion(-)
diff --git a/common/cpu.c b/common/cpu.c
index f182cfde..31506264 100644
--- a/common/cpu.c
+++ b/common/cpu.c
@@ -484,6 +484,60 @@ static uint32_t detect_flags( void )
return flags;
}
+
+#elif defined(__APPLE__)
+#include <sys/sysctl.h>
+
+static int have_feature( const char *feature )
+{
+ int supported = 0;
+ size_t size = sizeof(supported);
+ if ( sysctlbyname( feature, &supported, &size, NULL, 0 ) )
+ return 0;
+ return supported;
+}
+
+static uint32_t detect_flags( void )
+{
+ uint32_t flags = 0;
+
+ if ( have_feature( "hw.optional.arm.FEAT_DotProd" ) )
+ flags |= X264_CPU_DOTPROD;
+ if ( have_feature( "hw.optional.arm.FEAT_I8MM" ) )
+ flags |= X264_CPU_I8MM;
+ /* No SVE and SVE2 feature detection available on Apple platforms. */
+ return flags;
+}
+
+#elif defined(_WIN32)
+#include <windows.h>
+
+static uint32_t detect_flags( void )
+{
+ uint32_t flags = 0;
+
+#ifdef PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE
+ if ( IsProcessorFeaturePresent( PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE ) )
+ flags |= X264_CPU_DOTPROD;
+#endif
+#ifdef PF_ARM_SVE_INSTRUCTIONS_AVAILABLE
+ if ( IsProcessorFeaturePresent( PF_ARM_SVE_INSTRUCTIONS_AVAILABLE ) )
+ flags |= X264_CPU_SVE;
+#endif
+#ifdef PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE
+ if ( IsProcessorFeaturePresent( PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE ) )
+ flags |= X264_CPU_SVE2;
+#endif
+#ifdef PF_ARM_SVE_I8MM_INSTRUCTIONS_AVAILABLE
+ /* There's no PF_* flag that indicates whether plain I8MM is available
+ * or not. But if SVE_I8MM is available, that also implies that
+ * regular I8MM is available. */
+ if ( IsProcessorFeaturePresent( PF_ARM_SVE_I8MM_INSTRUCTIONS_AVAILABLE ) )
+ flags |= X264_CPU_I8MM;
+#endif
+ return flags;
+}
+
#endif
uint32_t x264_cpu_detect( void )
@@ -509,7 +563,8 @@ uint32_t x264_cpu_detect( void )
#endif
// Where possible, try to do runtime detection as well.
-#if defined(__linux__) || HAVE_ELF_AUX_INFO
+#if defined(__linux__) || HAVE_ELF_AUX_INFO || \
+ defined(__APPLE__) || defined(_WIN32)
flags |= detect_flags();
#endif
--
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