[Bug rtl-optimization/62041] vector fneg codegen uses a subtract instead of an xor (x86-64)

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62041

--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #2)
> https://gcc.gnu.org/ml/gcc-patches/2014-07/msg01812.html would most likely
> fix it...

Ah, no, it doesn't:

  _2 = { -0.0, -0.0, -0.0, -0.0 } - x_1(D);

doesn't get simplified to negate_expr in gimple either.