http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56934
Bug #: 56934
Summary: ICE folding a COND_EXPR involving vectors
Classification: Unclassified
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: gli...@gcc.gnu.org
typedef long veci __attribute__((vector_size(16)));
veci f(double a, veci b){
return (a<2)?(b<3):(b!=b);
}
e.cc: In function 'veci f(double, veci)':
e.cc:3:27: internal compiler error: in fold_convert_loc, at fold-const.c:1972
return (a<2)?(b<3):(b!=b);
^
I think the folding should just be disabled in this case. Even if fold_convert
was taught how to convert scalars to vectors, it would produce a vector {1,1}
instead of {-1,-1} (and it would build a TRUTH_ANDIF_EXPR with vectors). I have
a fix as part of another patch.
An alternative fix would be to make truth_value_p return false for vectors,
which would make us regress on several optimizations I guess.
