Function llvmint::x86::fma_vfnmadd_sd

pub unsafe extern "C" fn fma_vfnmadd_sd(a: f64x2, b: f64x2, c: f64x2) -> f64x2

The llvm.x86.fma.vfnmadd.sd intrinsic; known as __builtin_ia32_vfnmaddsd in GCC.