[PATCH 4/4] Fix autoinc cbranch

[Segher Boessenkool]

On Sun, Nov 24, 2019 at 11:39:05AM -0600, Segher Boessenkool wrote:
> On Sun, Nov 24, 2019 at 03:19:49PM +0100, Bernd Schmidt wrote:
> > -      /* This continue is deliberate.  We do not want the uses of the
> > -	 jump put into reg_next_use because it is not considered safe to
> > -	 combine a preincrement with a jump.  */
> > -      if (JUMP_P (insn))
> > -	continue;
> 
> Huh, I wonder where that came from.  More archaelogy :-)

It came in as r115135 on the dataflow-branch.  Patch is at
https://gcc.gnu.org/ml/gcc-patches/2006-07/msg00037.html .

And that is where I lost track.

But.  Allowing autoinc into jump insns means those jump insns may then
eventually need an output reload; it may just have been because of that?


Segher