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Author SHA1 Message Date
Duncan Sands 4f53074cca Add a comment noting that the fdiv -> fmul conversion won't generate 
multiplication by a denormal, and some tests checking that.

llvm-svn: 154431
 2012-04-10 20:35:27 +00:00
Duncan Sands 2f1dc3814b Only have codegen turn fdiv by a constant into fmul by the reciprocal 
when -ffast-math, i.e. don't just always do it if the reciprocal can
be formed exactly.  There is already an IR level transform that does
that, and it does it more carefully.

llvm-svn: 154296
 2012-04-08 18:08:12 +00:00
Duncan Sands 5f8397a934 Convert floating point division by a constant into multiplication by the 
reciprocal if converting to the reciprocal is exact.  Do it even if inexact
if -ffast-math.  This substantially speeds up ac.f90 from the polyhedron
benchmarks.

llvm-svn: 154265
 2012-04-07 20:04:00 +00:00