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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/102989] Implement C2x's n2763 (_BitInt)
Date: Wed, 24 May 2023 14:18:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102989

--- Comment #47 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
But then the pass effectively has to do lifetime analysis of the _BitInt(N)=
 for
N > 128 etc. SSA_NAMEs and perform the partitioning of those SSA_NAMEs into
VAR_DECLs/PARM_DECLs/RESULT_DECLs, so that we don't blow away the local sta=
ck;
perhaps as you wrote with some local subgraphs turned into a loop which will
handle multiple operations together instead of just one operation per loop.
Or just use different VAR_DECLs but stick in clobbers where they will be de=
ad
and hope out of ssa can merge those.
Anyway, more work than I hoped.
Though, perhaps it can be also done incrementally, with bare minimum first =
and
improvements later.=