var-tracking bugfix

Daniel Jacobowitz
Thu Nov 23 16:27:00 GMT 2006

On Thu, Nov 23, 2006 at 01:56:45PM +0100, Bernd Schmidt wrote:
> The next Blackfin patch will add a call to split_all_insns from the
> reorg pass.  split_all_insns calls verify_flow_info, and in 4.3 this
> often aborts when debugging information is generated.  The var-tracking
> pass can change basic block boundaries in such a way that a control flow
> insn is no longer the last insn in a basic block, since a var tracking
> note can replace it.
> Fixed with this patch which just slightly changes the way these notes
> are emitted.  Bootstrapped and regression tested on i686-linux; I've
> also compiled a large number of files with -g before and after the
> change, the output was identical.  Committed as 119116.

Could you explain this a little more?  If I read it right, then the
var tracking note can move from one basic block to another because of
this patch.  Seems like that would be a problem, or at least a lurking
time bomb.

Daniel Jacobowitz

More information about the Gcc-patches mailing list