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Re: [PATCH, i386]: Handle subregs of AND zero extended address correctly
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Uros Bizjak <ubizjak at gmail dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Tue, 13 Mar 2012 13:01:51 -0700
- Subject: Re: [PATCH, i386]: Handle subregs of AND zero extended address correctly
- References: <CAFULd4bT9_KaDJRuaBEG_vdMSB8_qWAtWQxbu5737KejU0X6Pw@mail.gmail.com>
On Tue, Mar 13, 2012 at 9:21 AM, Uros Bizjak <ubizjak@gmail.com> wrote:
> Hello!
>
> We allow addresses, zero extended with (AND (Dimode OP)
> (0x0ffffffff)). Since we now track address mode precisely, we should
> convert this operand to a SImode subreg before passing it further down
> of ix86_decompose_address function. This fixes a small hole, where
> operands in wrong mode could squeeze through.
>
> 2012-03-13 ?Uros Bizjak ?<ubizjak@gmail.com>
>
> ? ? ? ?* config/i386/i386.c (ix86_decompose_address): Handle subregs of
> ? ? ? ?AND zero extended address correctly.
>
> Tested on x86_64-pc-linux-gnu {,-m32}, committed to mainline SVN.
I think this caused:
FAIL: gcc.target/i386/pr43766.c scan-assembler-not lea[lq]?[ \t]
with -mx32 on Linux/x86-64.
--
H.J.