Thank you a lot for your answer, Mr. Radhakrishnan! I think it was my mistake to use phrase "I will save LR at some place"... I mean I can catch the first instruction of any function precisely. And save LR value at that time to my local storage. And I also can catch the first instruction after exit from any function precisely. And will compare the address of this instruction with stored LR.
So, is it possible for gcc to generate code that will not save return address in LR before some call on ARM? Or it is forbidden? Vasily On Mon, Sep 23, 2013 at 7:07 PM, Ramana Radhakrishnan <ramana....@googlemail.com> wrote: >> And my main question is it possible to rely on this fact when >> compiling with gcc and different levels of optimizations? > > No it is not , the compiler (especially trunk) is free to use LR as a > temporary after epilogue has been generated at higher optimization > levels. > > >> Is it >> possible to generate some straightforward heuristic to detect this >> evens (with\without debug info)? > > With debug information you could in theory work this out but not > without it especially if LR were used as a temporary. > > regards > Ramana > > >> >> Thank you in advance for any suggestions! >> >> -- >> Best Regards, >> Vasily -- Best Regards, Vasily
