On Sun, Aug 21, 2016 at 02:04:49PM -0500, Daniel Santos wrote: > Thanks for the response! Perhaps an UNSPEC insn is needed here because I > have work to do on other passes too. For example, when the debug info is > created, it's giving the wrong location (on the stack) for where some > registers were saved.
Don't worry about this until you have the basics working. It is fiddly work but not really hard. > But my primary question is about how to generate a jump at the end of You could have a look at the rs6000 patterns (in rs6000.md) "*return_and_restore_gpregs_<mode>_r11" and the function that creates such patterns, "rs6000_emit_savres_rtx" in (rs6000.c). This does a whole bunch more than you need, but maybe you'll get the idea. Some points: - The pattern should describe all it does (restore what regs, etc.), not just the jump; - You should set a JUMP_LABEL (to ret_rtx) on the jump, and it should _be_ a jump_insn; - You want a separate pattern in the machine description for this. HTH, Segher
