FPCR_MINF
r->fp_sign = (rd == FPCR_MINF);
if (rd != FPCR_MINF) /* only -0 + -0 gives -0 */
case FPCR_MINF:
case FPCR_MINF:
case FPCR_MINF: /* toward -Inf iff negative */
#define FE_DOWNWARD FPCR_MINF