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Mirror of https://github.com/RPCS3/llvm-mirror
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When forming permutation-based unaligned vector loads, we need to know whether it is valid to read ahead of the requested address by a full vector length. Doing so is more efficient (and allows for more CSE with later loads), but could trigger a page fault if invalid. To determine validity, we look for other loads in the same block that access the relevant address range. The relevant point here is that we need to do this as part of the process of forming permutation-based vector loads, and this happens quite early in the SDAG pipeline - specifically before many of the address calculations are fully canonicalized. As a result, we need to try harder to recognize base+offset address computations, because they still might appear as chain of adds (base+offset+offset, for example). To account for this, we'll look through chains of adds, accumulating the constant offsets. llvm-svn: 246813 |
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