I have another gcc 4.3 question. I'm trying to find where in the code base the instrumentation for basic block coverage is done. I've tracked down where/how mcount() calls are generated, but I haven't even been able to determine what function(s) are called to increment a basic block's count. I'd also like to find more detailed information regarding profiling, coverage, and function instrumentation.
On Wed, Mar 22, 2023 at 6:27 PM Sid Maxwell <srmaxwe...@gmail.com> wrote: > Is there anyone on the list with experience with the gcc 4.3 codebase? > I'm currently maintaining a fork of it, with a PDP10 code generator. > > I've run into an issue involving the transformation of a movmemhi to a > single PDP10 instruction (an xblt, if you're curious). > The transformation appears to 'lose' its knowledge of being a store, > resulting in certain following stores being declared dead, and code > motion that shouldn't happen (e.g. a load moved before the xblt that > depends on the result of the xblt). > > I'm hoping to find someone who can help me diagnose the problem. We want > to use this instruction rather than the copy-word-loop currently generated > for struct assignments. > > Thanks, in advance, for any assistance. > > -+- Sid Maxwell >
