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Re: i386 PATCH for target/13685

From: Jason Merrill <jason at redhat dot com>
To: "H. J. Lu" <hjl at lucon dot org>
Cc: gcc-patches at gcc dot gnu dot org, Richard Henderson <rth at redhat dot com>
Date: Fri, 08 Sep 2006 00:51:29 -0400
Subject: Re: i386 PATCH for target/13685
References: <4500B8C5.8070003@redhat.com> <20060908014607.GA18956@lucon.org>

H. J. Lu wrote:

On Thu, Sep 07, 2006 at 08:26:45PM -0400, Jason Merrill wrote:
The testcase in 13685 breaks because -Os implies a smaller PREFERRED_STACK_BOUNDARY than SSE requires. This patch causes us to use the 128-bit boundary if SSE is enabled, which fixes the bug.

I think it is a bad idea for -Os to change ABI. There are several bugs
open because of it. You can have a program compiled with -Os calling
a library compiled with -msee. The program will crash since -Os
uses a different ABI. The easiest way to fix is for -Os not to change
the ABI automatically.

I wouldn't mind changing the stack boundary to always be 128 bits.

Jason

Follow-Ups:
- Re: i386 PATCH for target/13685
  - From: Eric Christopher
- Re: i386 PATCH for target/13685
  - From: Mark Mitchell

References:
- i386 PATCH for target/13685
  - From: Jason Merrill
- Re: i386 PATCH for target/13685
  - From: H. J. Lu

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