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As the testcase shows, bswap can match even byte-swapping or indentity from low part of some wider SSA_NAME. For bswap replacement other than for vector CONSTRUCTOR the code has been using NOP_EXPR casts if the types weren't compatible, but for vectors we need to use VIEW_CONVERT_EXPR. The problem with the latter is that we require that it has the same size, which isn't guaranteed, so this patch in those cases first adds a narrowing NOP_EXPR cast and only afterwards does a VIEW_CONVERT_EXPR. 2021-01-07 Jakub Jelinek <jakub@redhat.com> PR tree-optimization/98568 * gimple-ssa-store-merging.c (bswap_view_convert): New function. (bswap_replace): Use it. * g++.dg/torture/pr98568.C: New test.
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