| Message ID | 20170428005042.18375-1-michael@niedermayer.cc |
|---|---|
| State | Accepted |
| Headers | show |
On Fri, 28 Apr 2017 02:50:42 +0200 Michael Niedermayer <michael@niedermayer.cc> wrote: > Suggested-by: "Ronald S. Bultje" <rsbultje@gmail.com> > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> > --- > doc/developer.texi | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/doc/developer.texi b/doc/developer.texi > index dbe1f5421f..a948113792 100644 > --- a/doc/developer.texi > +++ b/doc/developer.texi > @@ -131,6 +131,11 @@ designated struct initializers (@samp{struct s x = @{ .i = 17 @};}); > > @item > compound literals (@samp{x = (struct s) @{ 17, 23 @};}). > + > +@item > +Implementation defined behavior for signed integers is assumed to match the > +expected for Twos complement. Non representable values in integer casts are binary Patch is ok, but "the expected for Twos complement" sounds a bit weird. Maybe "expected behavior"? Also "two's complement". > +truncated. Shift right of signed values uses sign extension. > @end itemize > > These features are supported by all compilers we care about, so we will not
On Fri, Apr 28, 2017 at 12:52:45PM +0200, wm4 wrote: > On Fri, 28 Apr 2017 02:50:42 +0200 > Michael Niedermayer <michael@niedermayer.cc> wrote: > > > Suggested-by: "Ronald S. Bultje" <rsbultje@gmail.com> > > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> > > --- > > doc/developer.texi | 5 +++++ > > 1 file changed, 5 insertions(+) > > > > diff --git a/doc/developer.texi b/doc/developer.texi > > index dbe1f5421f..a948113792 100644 > > --- a/doc/developer.texi > > +++ b/doc/developer.texi > > @@ -131,6 +131,11 @@ designated struct initializers (@samp{struct s x = @{ .i = 17 @};}); > > > > @item > > compound literals (@samp{x = (struct s) @{ 17, 23 @};}). > > + > > +@item > > +Implementation defined behavior for signed integers is assumed to match the > > +expected for Twos complement. Non representable values in integer casts are binary > > Patch is ok, but "the expected for Twos complement" sounds a bit weird. > Maybe "expected behavior"? Also "two's complement". applied with these modifications [...]
diff --git a/doc/developer.texi b/doc/developer.texi index dbe1f5421f..a948113792 100644 --- a/doc/developer.texi +++ b/doc/developer.texi @@ -131,6 +131,11 @@ designated struct initializers (@samp{struct s x = @{ .i = 17 @};}); @item compound literals (@samp{x = (struct s) @{ 17, 23 @};}). + +@item +Implementation defined behavior for signed integers is assumed to match the +expected for Twos complement. Non representable values in integer casts are binary +truncated. Shift right of signed values uses sign extension. @end itemize These features are supported by all compilers we care about, so we will not
Suggested-by: "Ronald S. Bultje" <rsbultje@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> --- doc/developer.texi | 5 +++++ 1 file changed, 5 insertions(+)