Renato Golin b4dd6c5945 Avoid NEON SP-FP unless unsafe-math or Darwin ...

NEON is not IEEE 754 compliant, so we should avoid lowering single-precision
floating point operations with NEON unless unsafe-math is turned on. The
equivalent VFP instructions are IEEE 754 compliant, but in some cores they're
much slower, so some archs/OSs might still request it to be on by default,
such as Swift and Darwin.

llvm-svn: 177651

2013-03-21 18:47:47 +00:00

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