Fix PR tree-optimization/77808, ICE in duplicate_ssa_name_ptr_info, at tree-ssanames.c:630 starting with r240439

Christophe Lyon
Sat Oct 1 14:57:00 GMT 2016

Hi Doug,

On 1 October 2016 at 03:35, Doug Gilmore <> wrote:
> My commit r240439 didn't handle the situation where setting
> --param prefetch-latency=0 can cause the prefetch address to
> be the same as the original address.  In this case, no
> copying of points-to information should be done.
> Bootstrapped and regression tested on x86_64-linux, ok for
> trunk?
> Doug

I can confirm that your patch fixes the ICE I was seeing.

However, the new testcase does not pass on low end
cc1: warning: -fprefetch-loop-arrays not supported for this target
(try -march switches)

Can you add a guard?



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