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From: "bruce at hoult dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114194] ICE when using std::unique_ptr with xtheadvector
Date: Tue, 05 Mar 2024 02:21:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114194

--- Comment #6 from Bruce Hoult <bruce at hoult dot org> ---
The ICE also happens with bzero().

The ICE does NOT happen with a constant length of 16 of greater, in which c=
ase
a function call is made instead of expanding inline.

With rv64gv or rv64gcv a series of N `sb` are generated (N < 16)

With rv64gc_xtheadvector, N >=3D 6, and -Os a tail call to memset is genera=
ted,
no ICE. With N < 6 ... ICE.

So the problem is only trying to expand memset() or bzero() inline. Does it=
 try
to use a vectorised memset? That doesn't happen with rv64gcv.

memcpy() does not ICE for any N.

I assume the originally reported C++ code is generating a memset() to
initialise one of the classes/structs.=