-There are other non-conformant long double types: eg. ppc abi (both SVR4 and
-the newer eabi) uses 128 bit long doubles, but it's software emulated using
-(the newer <a href="http://www.freescale.com/files/32bit/doc/app_note/PPCEABI.pdf">ppc eabi</a> uses ld64).
+There are other non-conformant long double types: eg. the old SVR4 abi for ppc
+uses 128 bit long doubles, but it's software emulated and traditionally
+implemented using
+<a href="https://en.wikipedia.org/wiki/Quadruple_precision#Double-double_arithmetic">two doubles</a>
+(also called ibm long double as this is what ibm aix used on ppc).