[PATCH] D13994: [SimplifyLibCalls] Optimization for pow(x, n) where n is some constant

[Mandeep Singh Grang via llvm-commits]

mgrang marked an inline comment as done.
mgrang added a comment.

I have limited the transformation to a max of 8 fmuls (thus max exponent=32).

Using addition-chains can reduce the no. of fmuls in few cases but storing the addition-chains for each exponent will incur space overhead.
The current implementation of exponentiation by binary expansion seems much cleaner IMO.


http://reviews.llvm.org/D13994