------- Additional Comments From ch at dot-heine dot de 2005-02-27 22:05 ------- Subject: Re: signed/unsigned multiplication + sign extension broken 32->64 bit sign promotion?
pinskia at gcc dot gnu dot org wrote: > ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-27 > 21:10 ------- > This is invalid. > (unsigned int)(signed_char) is still signed extened. > if you don't want a sign extension do: > (unsigned int)(unsigned char)(signed_char). I'll getter get myself a copy of the ANSI standard. However, this is still funny. This means that I have sign extension when I skip an integer size in between, so (unsigned long)(signed short) will be promoted sign extended to 64 bits but (unsigned long)(signed int) will not. Ok. But then there is a bug in h8300.c in h8300_emit_stack_adjustment() where such a construct is passed to GEN_INT() which will not do the sign extension; later on that integer is compared with the result of trunc_int_for_mode() which _does_ sign extension. I'll submit a corresponding bug report later. Thx for the quick reply Claus -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20238
