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This contains both a generic fixlet for targets implementing the leaf register optimization (SPARC and Xtensa) and the implementation of the target hook TARGET_ZERO_CALL_USED_REGS which is needed to make this work on the SPARC. gcc/ChangeLog: * function.c (gen_call_used_regs_seq): In a function subject to the leaf register optimization, skip registers that are not present. * config/sparc/sparc.c (TARGET_ZERO_CALL_USED_REGS): Define to... (sparc_zero_call_used_regs): ...this. New function.
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