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Author SHA1 Message Date
Benjamin Kramer
8398512f89 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128555 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-30 17:02:54 +00:00
Benjamin Kramer
546739656e InstCombine: If the divisor of an fdiv has an exact inverse, turn it into an fmul. 
Fixes PR9587.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128546 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-30 15:42:35 +00:00