Give lit a --xunit-xml-output option for saving results in xunit format
  
  --xunit-xml-output saves test results to disk in JUnit's xml format. This will allow Jenkins to report the details of a lit run.
  
  Based on a patch by David Chisnall.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223163 91177308-0d34-0410-b5e6-96231b3b80d8
[X86][SSE] Keep 4i32 vector insertions in integer domain on SSE4.1 targets

4i32 shuffles for single insertions into zero vectors lowers to X86vzmovl which was using (v)blendps - causing domain switch stalls. This patch fixes this by using (v)pblendw instead.

The updated tests on test/CodeGen/X86/sse41.ll still contain a domain stall due to the use of insertps - I'm looking at fixing this in a future patch.

Differential Revision: http://reviews.llvm.org/D6458



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223165 91177308-0d34-0410-b5e6-96231b3b80d8
Apply loop-rotate to several vectorizer tests.

Such loops shouldn't be vectorized due to the loops form.
After applying loop-rotate (+simplifycfg) the tests again start to check
what they are intended to check.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223170 91177308-0d34-0410-b5e6-96231b3b80d8
PR21302. Vectorize only bottom-tested loops.

rdar://problem/18886083

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223171 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64: don't be too greedy when folding :lo12: accesses into mem ops.

This frequently leads to cases like:
   ldr xD, [xN, :lo12:var]
   add xA, xN, :lo12:var
   ldr xD, [xA, #8]

where the ADD would have been needed anyway, and the two distinct addressing
modes can prevent the formation of an ldp. Because of how we handle ADRP
(aggressively forming an ADRP/ADD pseudo-inst at ISel time), this pattern also
results in duplicated ADRP instructions (one on its own to cover the ldr, and
one combined with the add).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223172 91177308-0d34-0410-b5e6-96231b3b80d8