------- Comment #10 from uros at kss-loka dot si 2006-10-25 14:16 ------- (In reply to comment #9)
> > In the later case, expansion will fall-back to normal library call. > > OK. So on system where the math library doesn't have remainderl, for example, > we shouldn't use BUILT_IN_REMAINDERL or it will be missing at link-time? If > that's the case, then we can't implement MOD/MODULO with these built-ins. You can check for TARGET_C99_FUNCTIONS before they are used. > > Fortunatelly, no. The result will be correct. You can see the effect of > > -fno-math-errno at http://gcc.gnu.org/ml/gcc-patches/2006-10/msg01158.html. > > And now, a harder question: could we activate no-math-errno on a per-call > basis? That is, have the front-end emit a call to BUILT_IN_FOO and specify > that, for this call, errno doesn't have to be set? errno expansion for this particular built-in is inhibited in line 1995 of builtins.c. For a per-call basis, we need an argument to expand_builtin() function to disable errno expansion. However, the rationale for this is unclear to me. IMO - either we use errno, or we don't. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24518
