[PATCH] D26819: Integer division expansion should handle constant divisors intelligently

[Dmitri Shtilman via llvm-commits]

Hi all,

The following patch improves integer division sw expansion.
Namely - the case of division by a constant, which would be expanded to a simple multiplication by a magic number rather than a full division loop.
Implementation follows the DAG code in TargetLowering::BuildSDIV().
Ref: "Hacker's Delight" or "The PowerPC Compiler Writer's Guide”.

Please review.
Dmitri

https://reviews.llvm.org/D26819
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