llvm-project

Commit Graph

Author	SHA1	Message	Date
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
Bob Wilson	ba8ac74fd9	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. llvm-svn: 97065	2010-02-24 22:15:53 +00:00
Bob Wilson	c6c13a3515	Use NEON vmin/vmax instructions for floating-point selects. Radar 7461718. llvm-svn: 96572	2010-02-18 06:05:53 +00:00

Author

SHA1

Message

Date

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

Bob Wilson

ba8ac74fd9

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.

llvm-svn: 97065

2010-02-24 22:15:53 +00:00

Bob Wilson

c6c13a3515

Use NEON vmin/vmax instructions for floating-point selects.

Radar 7461718.

llvm-svn: 96572

2010-02-18 06:05:53 +00:00

3 Commits