3 Commits

Author	SHA1	Message	Date
Duncan Sands	6d360055c5	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	28b9aa998e	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	cd52f3d447	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