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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
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