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Re: [PATCH 4/4] Fix autoinc cbranch
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