Chandler Carruth be6c70dbd4 [shuffle] Teach the shuffle fuzzer to fuzz blends, including forming
a tree of inputs to blend iteratively together.

This required a pretty substantial rewrite of the innards. The number of
shuffle instructions is now bounded in terms of tree-height. There is
a flag to disable blends so that its still possible to test single input
shuffles. I've also improved various aspects of how the test program is
generated, primarily to simplify the test harness and allow some
optimizations to clean up how we actually check the results and build up
the inputs.

Again, apologies for my likely horrible use of Python... But hey, it
works! (Ish?)

llvm-svn: 215530
2014-08-13 09:05:59 +00:00
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