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libm: Detect fast fmaf support 

Anything with fast FMA is assumed to have fast FMAF, along with
32-bit arms that advertise 32-bit FP support and __ARM_FEATURE_FMA

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard via Newlib 2020-08-08 15:34:12 -07:00 committed by Corinna Vinschen
parent 432b331c79
commit 0c1989070e
1 changed files with 8 additions and 0 deletions
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8
newlib/libm/common/math_config.h
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@ -79,6 +79,14 @@
# endif
#endif
#ifndef HAVE_FAST_FMAF
# if HAVE_FAST_FMA || (__ARM_FEATURE_FMA && (__ARM_FP & 4))
# define HAVE_FAST_FMAF 1
# else
# define HAVE_FAST_FMAF 0
# endif
#endif
#if HAVE_FAST_ROUND
/* When set, the roundtoint and converttoint functions are provided with
the semantics documented below. */