update NEWS

joe-nano · May 16, 2019 · b43eba5 · b43eba5
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+FFTW 3.3.9:
+
+* Fix wisdom for avx512.
+
+  The avx512 alignment requirement was set to 64 bytes, but this is
+  wrong.  Alignment requirements are a property of the platform (e.g.,
+  x86) and not of the instruction set (e.g., AVX).  Among other
+  things, this broke wisdom with avx512.
+
+  Note that avx512 support is still experimental because the FFTW
+  authors have no avx512 hardware available for testing.
+
 FFTW 3.3.8:
 
 * Fixed AVX, AVX2 for gcc-8.