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Summary: Aiming to correct the ordering of loads/stores. This patch changes the insert point for loads to the position of the first load. It updates the ordering method for loads to insert before, rather than after. Before this patch the following sequence: "load a[1], store a[1], store a[0], load a[2]" Would incorrectly vectorize to "store a[0,1], load a[1,2]". The correctness check was assuming the insertion point for loads is at the position of the first load, when in practice it was at the last load. An alternative fix would have been to invert the correctness check. The current fix changes insert position but also requires reordering of instructions before the vectorized load. Updated testcases to reflect the changes. Reviewers: tstellarAMD, llvm-commits, jlebar, arsenm Subscribers: mzolotukhin Differential Revision: http://reviews.llvm.org/D22071 llvm-svn: 275117 |
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