On Wed, 2011-08-24 at 16:05 -0500, Peter Bigot wrote: > Look at msp430-builtins.c in the implementation for delay cycles for > examples of generating local labels, comparison, and jump > instructions. You can probably use something like gen_rtx_MEM (Pmode, > gen_rtx_SYMBOL_REF (HImode, "__stack_base")) and use that to compare > against stack_pointer_rtx rather than having to push and pop r15.
Sorry for being so "helpless", but I looked at msp430-builtins.c and most of the code for delay cycles seems to just compute the number of required cycles. The only thing that is RTL related is a call to gen_delay_cycles() [which I never found the declaration for] and an emit_insn(). Perhaps I'm looking in the wrong place. I'm on the top commit on the master branch of git://mspgcc.git.sourceforge.net/gitroot/mspgcc/mspgcc > The ICEs are likely if you don't set RTX_FRAME_RELATED_P on the prolog > insns that access the stack pointer. Digging through GCC code I managed to find emit_cmp_and_jump_insns() but I have no reference to the generated insns to set RTX_FRAME_RELATED_P. I guess it makes sense though not to return any insn, since it may generate more than just one. > If you get it working solidly, please file a tracker ticket on the > mspgcc project and submit a patch for review and incorporation into > the development branches. The final version should set a new frame > flag in msp430_set_current_function, and implement it in > expand_prologue, probably right before MSP430_FF_prologue_eint. Considering my lack of experience with RTL api, I think it's a long way to go before getting it to work at least "for experimental purposes". But of course, I want to share my work with the community :) > You might also want to look at what -fstack-check really does and > whether what you describe is compatible with its use on other > platforms. A quick check suggests it's mostly implemented in the > middle-end and may result in code generated that depends on some > runtime support for stack probes. -mstack-check may be more > appropriate for the approach you describe. I'll look into this as well. Thanks for all the suggestions! Best regards, Radu ------------------------------------------------------------------------------ EMC VNX: the world's simplest storage, starting under $10K The only unified storage solution that offers unified management Up to 160% more powerful than alternatives and 25% more efficient. Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev _______________________________________________ Mspgcc-users mailing list Mspgcc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mspgcc-users
