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Minimalistic fast math support #551

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Minimalistic fast math support #551

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Prevent reordering of some floating point op under fast-math
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@serge-sans-paille
serge-sans-paille committed Oct 12, 2021
commit 66e950d2e90c29f826f0ad2c842861c4b6ab4b42
4 changes: 2 additions & 2 deletions include/xsimd/arch/generic/xsimd_generic_math.hpp
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Expand Up @@ -1733,8 +1733,8 @@ namespace xsimd {
// to v. That's not what we want, so prevent compiler optimization here.
// FIXME: it may be better to emit a memory barrier here (?).
#ifdef __FAST_MATH__
volatile batch_type d0 = v + t2n;
batch_type d = *(batch_type*)(void*)(&d0) - t2n;
volatile auto d0 = (v + t2n).data;
batch_type d = batch_type(d0) - t2n;
#else
batch_type d0 = v + t2n;
batch_type d = d0 - t2n;
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