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Sjoerd Meijer
e964d52e2d
Constants can also be materialised using the negated value and a MVN, and this case seem to have been missed for Thumb2. To check the constant materialisation costs, we now call getT2SOImmVal twice, once for the original constant and then also for its negated value, and this function checks if the constant can both be splatted or rotated. This was revealed by a test that optimises for minsize: instead of a LDR literal pool load and having a literal pool entry, just a MVN with an immediate is smaller (and also faster). Differential Revision: https://reviews.llvm.org/D57327 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352737 91177308-0d34-0410-b5e6-96231b3b80d8
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