llvm-project

6117bdd9 - [DAGCombiner] Fix subvector extraction index for big-endian STLF (#180795)

[DAGCombiner] Fix subvector extraction index for big-endian STLF (#180795) This PR fixes a big-endian regression in `ForwardStoreValueToDirectLoad` where the wrong subvector was being extracted. In big-endian, memory offset 0 corresponds to the high bits, so the extraction index needs to be adjusted. As suggested by @KennethHilmersson, calculate the extraction index as the difference between the number of elements in the intermediate vector and the load vector when in big-endian mode. Special thanks to Kenneth Hilmersson for providing the fix logic and the ARM regression test. https://github.com/llvm/llvm-project/pull/172523#issuecomment-3878065191 https://github.com/llvm/llvm-project/pull/172523#issuecomment-3879575092