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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/102143] ABI incompatibility with clang when passing 32bit vectors on 32bit i686
Date: Wed, 01 Sep 2021 07:24:03 +0000 [thread overview]
Message-ID: <bug-102143-4-r1eRT4TxZp@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-102143-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102143
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to H.J. Lu from comment #1)
> 16-bit and 32-bit vector pass and return are not specified in i386 psABI.
> 64-bit vector is specified, not really usable. Any suggestions?
With -mno-sse, clang creates:
foo:
movzwl 16(%esp), %edx
movzwl 12(%esp), %eax
addw 4(%esp), %ax
addw 8(%esp), %dx
retl
So, it is incompatible with itself for -msse/-mno-sse differences. The ABI
should be ISA agnostic, so using integer ABI as implemented by gcc is IMO the
way to go.
next prev parent reply other threads:[~2021-09-01 7:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-31 8:45 [Bug target/102143] New: " ubizjak at gmail dot com
2021-08-31 13:36 ` [Bug target/102143] " hjl.tools at gmail dot com
2021-09-01 7:24 ` ubizjak at gmail dot com [this message]
2021-09-01 7:28 ` ubizjak at gmail dot com
2021-09-01 7:32 ` jakub at gcc dot gnu.org
2021-09-01 7:33 ` ubizjak at gmail dot com
2021-09-02 2:02 ` hjl.tools at gmail dot com
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