https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122292
--- Comment #3 from Robin Dapp <rdapp at gcc dot gnu.org> --- Before: _ifc__35 = .MASK_LEN_FOLD_LEFT_PLUS (res_20, vect__7.13_62, mask__27.10_57, _66, 0); After: _ifc__35 = .FOLD_LEFT_PLUS (res_20, vect__7.13_62); The issue is that the patch uses SLP_TREE_VECTYPE (SLP_TREE_CHILDREN (slp_node)[0]); but here we have a cond reduction on an IFN_COND where the first child is the mask. So we try to find an optab for a mask reduction and fail, using a FOLD_LEFT_PLUS instead (didn't check why we didn't give up then, though). So I guess we need to adjust the operand number for cond reductions as we do in other places.
