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[SVE][LoopVectorize] Verify support for vectorizing loops with invariant loads

Authored by kmclaughlin on Mar 25 2021, 6:37 AM.

Description

[SVE][LoopVectorize] Verify support for vectorizing loops with invariant loads

D95598 added a cost model for broadcast shuffle, which should enable loops
such as the following to vectorize, where the load of b[42] is invariant
and can be done using a scalar load + splat:

for (int i=0; i<n; ++i)
  a[i] = b[i] + b[42];

This patch adds tests to verify that we can vectorize such loops.

Reviewed By: joechrisellis

Differential Revision: https://reviews.llvm.org/D98506

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