[PATCH] D26628: Integer legalization: fix MUL expansion

[Paweł Bylica via llvm-commits]

chfast created this revision.
chfast added a reviewer: hfinkel.
chfast added a subscriber: llvm-commits.

This fixes the runtime results produces by the fallback multiplication expansion introduced in r270720.

For tests I created a fuzz tester that compares the results with Boost.Multiprecision.


https://reviews.llvm.org/D26628

Files:
  lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  test/CodeGen/X86/mul-i1024.ll
  test/CodeGen/X86/mul-i256.ll
  test/CodeGen/X86/mul-i512.ll

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