Evandro Menezes 23cfeced38 [InstCombine] Expand the simplification of pow() into exp2()
Generalize the simplification of `pow(2.0, y)` to `pow(2.0 ** n, y)` for all
scalar and vector types.

This improvement helps some benchmarks in SPEC CPU2000 and CPU2006, such as
252.eon, 447.dealII, 453.povray.  Otherwise, no significant regressions on
x86-64 or A64.

Differential revision: https://reviews.llvm.org/D49273

llvm-svn: 341095
2018-08-30 19:04:51 +00:00

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