The movsi and movdi constraints allowed the source to be any absolute symbolic expression ("S"). That's OK for operands that have already been vetted by the aarch64_mov_operand predicate but causes problems if the register allocator substitutes an equivalence (the usual "the constraints can't accept more than the predicates" restriction). Although all other uses of "S" in the backend are redundant and could in principle be removed, "S" itself is a publicly-documented constraint and so we'd have to keep its definition. This patch therefore adds a new "Usa" constraint for legitimate absolute address operands. 2017-05-08 Richard Sandiford <richard.sandiford@arm.com> gcc/ * config/aarch64/constraints.md (Usa): New constraint. * config/aarch64/aarch64.md (*movsi_aarch64, *movdi_aarch64): Use it. From-SVN: r247746
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