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Re: [RFC][PATCH 0/2] aarch64: Add optimized ASIMD versions of sinf/cosf
On Tue, 13 Jun 2017, Adhemerval Zanella wrote:
> x86_64 does this trick using ifunc (sysdeps/x86_64/fpu/multiarch/e_pow-fma4.c
> for instance).
That's only relevant where you have architecture variants with and without
fma (then you can have a generic source file, built with different options
and using IFUNC). For 32-bit ARM conditional fma availability is relevant
(bug 15503 notes that we ought to use VFMA in the fma / fmaf functions in
glibc, with IFUNCs where necessary), for AArch64 fma is always present.
Joseph S. Myers