http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57066
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |4.1.3
Keywords| |wrong-code
Last reconfirmed| |2013-04-25
Ever Confirmed|0 |1
Summary|std::logb(-inf) returns |[4.7/4.8/4.9 Regression]
|wrong value |std::logb(-inf) returns
| |wrong value
Target Milestone|--- |4.7.4
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2013-04-25
08:05:04 UTC ---
/* Fold a call to builtin logb/ilogb. */
static tree
fold_builtin_logb (location_t loc, tree arg, tree rettype)
{
...
switch (value->cl)
{
case rvc_nan:
case rvc_inf:
/* If arg is Inf or NaN and we're logb, return it. */
if (TREE_CODE (rettype) == REAL_TYPE)
return fold_convert_loc (loc, rettype, arg);
is wrong for -inf. Folding introduced in 2007 thus a regression.
