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The mul24 matching could interfere with SLSR and the other addressing mode related passes. This probably is not the optimal placement, but is an intermediate step. This should probably be moved after all the generic IR passes, particularly LSR. Moving this after LSR seems to help in some cases, and hurts others. As-is in this patch, in idiv-licm, it saves 1-2 instructions inside some of the loop bodies, but increases the number in others. Moving this later helps these loops. In the new lsr tests in mul24-pass-ordering, the intrinsic prevents introducing more instructions in the loop preheader, so moving this later ends up hurting them. This shouldn't be any worse than before the intrinsics were introduced in r366094, and LSR should probably be smarter. I think it's because it doesn't know the and inside the loop will be folded away. llvm-svn: 369991 |
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