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This simplifies the code by adding a predicate and a constraint for 1/2/3. The aarch64 backend has a similar predicate called aarch64_shift_imm_<mode> which they use there. OK? Built and tested on riscv32-linux-gnu and riscv64-linux-gnu with no regressions. Thanks, Andrew Pinski gcc/ChangeLog: * config/riscv/constraints.md (Ds3): New constraint. * config/riscv/predicates.md (imm123_operand): New predicate. * config/riscv/bitmanip.md (*shNadd): Use Ds3 and imm123_operand. (*shNadduw): Likewise.
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