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This PR is about the rs6000 backend emitting wrong assembly for whole vector shift by 0, and while I think it is desirable to fix the backend, I don't see a point why the expander should try to emit that, whole vector shift by 0 is identity, we can just return the operand. 2020-04-23 Jakub Jelinek <jakub@redhat.com> PR target/94710 * optabs.c (expand_vec_perm_const): For shift_amt const0_rtx just return v2.
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