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A comment on How to write efficient matrix multiplication. Parent comment

Re:How to write efficient matrix multiplication by imurray on Sunday May 27, 2018 @05:35PM (#17169226)
This code:

    #define CSR_FLUSH_TO_ZERO         (1 << 15)
    unsigned csr = __builtin_ia32_stmxcsr();
    csr |= CSR_FLUSH_TO_ZERO;
    __builtin_ia32_ldmxcsr(csr);
from https://stackoverflow.com/a/8217313/ seems to work for me with gcc. I don't know how widely supported it would be.
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