https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102989
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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Attachment #55567|0 |1
is obsolete| |
--- Comment #85 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 55572
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55572&action=edit
gcc14-bitint-wip.patch
At least the x86-64 _BitInt psABI says that the padding bits are undefined and
the various other psABI proposals do that as well.
Though, when looking at RTL expansion, we were doing REDUCE_BIT_FIELD after
operations, meaning that that we effectively relied on those bits at least for
small/middle _BitInt to be sign or zero extended.
This change tries to force sign/zero extensions when reading _BitInt from
memory, parameters etc.
