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> > where POINTER_PLUS_EXPR last operand has sizetype type, thus unsigned, > > and in the testcase gimple_assign_rhs2 (def) is thus 0xf000000000000001ULL > > which multiplied by 8 doesn't fit into signed HWI. If it would be treated > > as signed offset instead, it would fit (-0xfffffffffffffffLL, multiplied > > by 8 is -0x7ffffffffffffff8LL). Unfortunately with the poly_int obfuscation > > I'm not sure how to convert it from unsigned to signed poly_int. > > mem_ref_offset provides a boiler-plate for this: > > poly_offset_int::from (wi::to_poly_wide (TREE_OPERAND (t, 1)), SIGNED); Thanks, that seems to work. The test now works on both big-endian and little-endian. 2020-03-05 Richard Biener <rguenther@suse.de> Jakub Jelinek <jakub@redhat.com> PR tree-optimization/93582 * tree-ssa-sccvn.c (vn_reference_lookup_3): Treat POINTER_PLUS_EXPR last operand as signed when looking for memset offset. Formatting fix. * gcc.dg/tree-ssa/pr93582-11.c: New test. Co-authored-by: Richard Biener <rguenther@suse.de>
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