x86/intmath: add VEX encoded versions of av_clipf() and av_clipd()

Prevents mixing inlined SSE instructions and AVX instructions when the compiler
generates the latter.

Signed-off-by: James Almer <jamrial@gmail.com>

libavutil/x86/intmath.h

@@ -134,6 +134,36 @@ static av_always_inline av_const float av_clipf_sse(float a, float amin, float a
 
 #endif /* __SSE__ */
 
+#if defined(__AVX__) && !defined(__INTEL_COMPILER)
+
+#undef av_clipd
+#define av_clipd av_clipd_avx
+static av_always_inline av_const double av_clipd_avx(double a, double amin, double amax)
+{
+#if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
+    if (amin > amax) abort();
+#endif
+    __asm__ ("vmaxsd %1, %0, %0 \n\t"
+             "vminsd %2, %0, %0 \n\t"
+             : "+&x"(a) : "xm"(amin), "xm"(amax));
+    return a;
+}
+
+#undef av_clipf
+#define av_clipf av_clipf_avx
+static av_always_inline av_const float av_clipf_avx(float a, float amin, float amax)
+{
+#if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
+    if (amin > amax) abort();
+#endif
+    __asm__ ("vmaxss %1, %0, %0 \n\t"
+             "vminss %2, %0, %0 \n\t"
+             : "+&x"(a) : "xm"(amin), "xm"(amax));
+    return a;
+}
+
+#endif /* __AVX__ */
+
 #endif /* __GNUC__ */
 
 #endif /* AVUTIL_X86_INTMATH_H */