https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96512

--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> ---
It's ok with GCC8.4.0.

/export/liuhongt/install/gcc8.4.0/bin/gcc -O1 -D_GCC_VEC_=1
-march=skylake-avx512 test.c -lm 

./a.out 

SIMD: avx512 -- vector size = 8
:: 0 == 0
:: 0.0666667 == 0.0666667
:: 0.133333 == 0.133333
:: 0.2 == 0.2
:: 0.266667 == 0.266667
:: 0.333333 == 0.333333
:: 0.4 == 0.4
:: 0.466667 == 0.466667
:: 0.533333 == 0.533333
:: 0.6 == 0.6
:: 0.666667 == 0.666667
:: 0.733333 == 0.733333
:: 0.8 == 0.8
:: 0.866667 == 0.866667
:: 0.933333 == 0.933333
:: 1 == 1

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