This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: gcc register allocation error when reloading an asm

From: Richard Henderson <rth at redhat dot com>
To: "Bodart, Mitch L" <mitch dot l dot bodart at intel dot com>
Cc: "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
Date: Tue, 22 Nov 2011 12:31:24 -0800
Subject: Re: gcc register allocation error when reloading an asm
References: <EB7CC8AE19F50143950B90CF3853203C20B65892@orsmsx509.amr.corp.intel.com> <4ECBF94F.1030204@redhat.com> <EB7CC8AE19F50143950B90CF3853203C20B65910@orsmsx509.amr.corp.intel.com>

On 11/22/2011 12:11 PM, Bodart, Mitch L wrote:
> Unfortunately the source change suggestion didn't work, but that's OK because I can make the asm work by eliminating some register pressure.

Hmm.  Well, if you keep that "memory" clobber there, you don't actually
need to represent the RW memory as an output at all -- we're indicating
that all memory is changed.

Try just "=r"(out) : "m"(*ptr) and see if that works.

Otherwise... well, you've got your register pressure reduction.


r~

References:
- gcc register allocation error when reloading an asm
  - From: Bodart, Mitch L
- Re: gcc register allocation error when reloading an asm
  - From: Richard Henderson
- RE: gcc register allocation error when reloading an asm
  - From: Bodart, Mitch L

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]