[llvm-commits] A patch to add vector-zext support to LLVM

[Rotem, Nadav]

Hi,

Currently (according to LangRef) LLVM does not support code generation of vector zext (PR 9267). It looks like the problem is in the DAGCombiner which folds the zext into complex load instructions. The attached patch prevents this optimization on vectors since AFAIK none of the supported targets knows how to perform load+vector_zext in one instruction.
This patch enables code generation of vector zexts, which are expanded properly.
Added tests and changed LangRef.

Thanks,
Nadav
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