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The size of the FPU registers is dictated by the 'f' and 'd' features, not the core processor register size. Processors with the 'd' feature have 64-bit FPU registers. Processors without the 'd' feature but with the 'f' feature have 32-bit FPU registers. Signed-off-by: Keith Packard <keithp@keithp.com> [Palmer: This requires manually triggering a rebuild of riscv32-softmmu/gdbstub-xml.c] Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>