On Tue, 07 Sep 2010 21:06:10 +0800 Yao Qi <yao...@linaro.org> wrote: > Julian Brown wrote: > > So yeah, I think there is indeed a possible improvement here (and we > > don't even need to break the EABI, I don't think). Unless I've > > overlooked something, anyway... > Julian, > I revert back the first example, and add your comments in it. > https://wiki.linaro.org/YaoQi/Sandbox/Thumb2SizeOptimize > > In order to teach gcc chooses low register when keeping stack > alignment, which part of gcc shall I have a look? Is it about RA or > regrename?
No, all the code to generate prologues & epilogues is target-specific, and happens after register allocation. Take a look at e.g. arm.c:arm_expand_prologue and friends. (Beware though, they can be quite fiddly!) Julian _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain
