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7ef0949020
This is an alternative to https://reviews.llvm.org/D37896. We can't decompose multiplies generically without a target hook to tell us when it's profitable. ARM and AArch64 may be able to remove some existing code that overlaps with this transform. This extends D52195 and may resolve PR34474: https://bugs.llvm.org/show_bug.cgi?id=34474 (still an open question about transforming legal vector multiplies, but we could open another bug report for those) llvm-svn: 342844
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