K 10
svn:author
V 3
dim
K 8
svn:date
V 27
2023-08-13T08:44:18.947367Z
K 7
svn:log
V 893
Use a builtin where possible in msun

Some of the functions in msun can be implemented using a compiler
builtin function to generate a small number of instructions. Implement
this support in fma, fmax, fmin, and sqrt on arm64.

Care must be taken as the builtin can be implemented as a function
call on some architectures that lack direct support. In these cases
we need to use the original code path.

As we don't set errno on failure build with -fno-math-errno so the
toolchain doesn't convert a builtin into a function call when it
detects a failure, e.g. gcc will add a call to sqrt when the input
is negative leading to an infinite loop.

Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D32801

(cherry picked from commit b2e843161dc3b79777e873183447c92ed9c3703a)

Git Hash:   dd565d99901a891192e0b821cab5f9523c603f38
Git Author: andrew@FreeBSD.org
END