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3 Commits

Author SHA1 Message Date
Renato Golin
3382a84074 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177651 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-03-21 18:47:47 +00:00
Bob Wilson
e742bb53a3 Check for comparisons of +/- zero when optimizing less-than-or-equal and 
greater-than-or-equal SELECT_CCs to NEON vmin/vmax instructions.  This is
only allowed when UnsafeFPMath is set or when at least one of the operands
is known to be nonzero.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97065 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-24 22:15:53 +00:00
Bob Wilson
9f6c4c141f Use NEON vmin/vmax instructions for floating-point selects. 
Radar 7461718.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96572 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-02-18 06:05:53 +00:00