https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108657
--- Comment #19 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
With the deferred stuff (why don't we DCE it for variables which are otherwise
not used?), all looks fine until fre5.
In fre4 we have
k ={v} {CLOBBER(eol)};
c = -1;
c = 1;
foo ();
return 0;
at the end which is reasonable, the outer loop iterates c = 1, c = 0 and c = -1
and then c = 1 is stored, dse4 optimizes it to:
k ={v} {CLOBBER(eol)};
c = 1;
foo ();
return 0;
in split-path, we have in bb2
c = 1;
then in one of the conditionalized bbs
c = 0;
and finally still
<bb 8> [local count: 38651690]:
k ={v} {CLOBBER(eol)};
c = 1;
foo ();
return 0;
at the end, but fre5 keeps those c = 1; and c = 0; early stores and drops the
last one.
