Vincent Lefevre <vincent+gcc@xxxxxxxxxx> writes: > But gcc has a real bug concerning the extended precision: it does > not convert the result into double precision (when using the type > "double") after a cast or assignment. Such a conversion is required > by the ISO C standard (see 5.1.2.3#13, 6.3.1.5#2 and 6.3.1.8#2). > There are no reasons not to fix it. For those who fear a performance > loss, gcc could define a compiler switch (that could be included in > -ffast-math). Try the -ffloat-store option. It's not the default because it's slows down the generated code too much, and most people don't care. But you raise an interesting point about the ISO C standard. It is possible that in strict C99 mode gcc should enable -ffloat-store on the x86. Ian
