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Author SHA1 Message Date
Benjamin Kramer af0ed953c5 Avoid turning a floating point division with a constant power of two into a denormal multiplication. 
Some platforms may treat denormals as zero, on other platforms multiplication
with a subnormal is slower than dividing by a normal.

llvm-svn: 128555
 2011-03-30 17:02:54 +00:00
Benjamin Kramer 8564e0de96 InstCombine: If the divisor of an fdiv has an exact inverse, turn it into an fmul. 
Fixes PR9587.

llvm-svn: 128546
 2011-03-30 15:42:35 +00:00