Nikita Popov 9d7e86a978 [CodeGen] Handle vector UADDO, SADDO, USUBO, SSUBO ...

This is part of https://bugs.llvm.org/show_bug.cgi?id=40442.

Vector legalization is implemented for the add/sub overflow opcodes.
UMULO/SMULO are also handled as far as legalization is concerned, but
they don't support vector expansion yet (so no tests for them).

The vector result widening implementation is suboptimal, because it
could result in a legalization loop.

Differential Revision: https://reviews.llvm.org/D57639

llvm-svn: 353464

2019-02-07 21:02:22 +00:00

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