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Subject: [Bug ipa/99122] [10/11 Regression] ICE in force_constant_size, at
 gimplify.c:733
Date: Wed, 17 Feb 2021 17:15:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99122

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That could perhaps work for the #c0 testcase where the function actually ha=
s a
non-VL parameter and so garbage in garbage out.
But would that work also for #c2?
If one dumps the #c2 testcase with -O2 -fno-inline -fdump-tree-optimized,
the PARM_DECL is clearly variable length but not lowered to *ptr, while
in the caller it is lowered that way and allocated through
__builtin_alloca_with_align.
So, clearly PARM_DECLs can be variable length but VAR_DECLs should not be (=
they
should be gimplified into ptr =3D __builtin_alloca_with_align with stack
save/restore around the scope and DECL_VALUE_EXPR of *ptr.
The inliner certainly doesn't do that right now.

For punting on inlining these, I couldn't find any spot that would try to
verify at least remote compatibility of the passed in arguments and the
arguments the callee expects.=