Signed-off-by: James Almer <[email protected]>
---
libavutil/x86/intmath.h | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/libavutil/x86/intmath.h b/libavutil/x86/intmath.h
index 7aa6bc4..c42fa83 100644
--- a/libavutil/x86/intmath.h
+++ b/libavutil/x86/intmath.h
@@ -24,15 +24,35 @@
#include <stdint.h>
#include "config.h"
+#if defined(__GNUC__)
+
/* Our generic version of av_popcount is faster than GCC's built-in on
* CPUs that don't support the popcnt instruction.
*/
-#if defined(__GNUC__) && defined(__POPCNT__)
+#if defined(__POPCNT__)
#define av_popcount __builtin_popcount
#if ARCH_X86_64
#define av_popcount64 __builtin_popcountll
#endif
-#endif /* defined(__GNUC__) && defined(__POPCNT__) */
+#endif /* __POPCNT__ */
+
+#if defined(__BMI2__)
+
+#define av_mod_uintp2 av_mod_uintp2_bmi2
+static av_always_inline av_const unsigned av_mod_uintp2_bmi2(unsigned a,
unsigned p)
+{
+ if (av_builtin_constant_p(p))
+ return a & ((1 << p) - 1);
+ else {
+ unsigned x;
+ __asm__ ("bzhi %2, %1, %0 \n\t" : "=r"(x) : "rm"(a), "r"(p));
+ return x;
+ }
+}
+
+#endif /* __BMI2__ */
+
+#endif /* __GNUC__ */
#endif /* AVUTIL_X86_INTMATH_H */
--
2.3.2
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