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Re: [PATCH] Fix -mstack-arg-probe (PR target/64513)

From: Jeff Law <law at redhat dot com>
To: Jakub Jelinek <jakub at redhat dot com>, Uros Bizjak <ubizjak at gmail dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Mon, 12 Jan 2015 13:32:49 -0700
Subject: Re: [PATCH] Fix -mstack-arg-probe (PR target/64513)
Authentication-results: sourceware.org; auth=none
References: <20150112202604 dot GT1405 at tucnak dot redhat dot com>

On 01/12/15 13:26, Jakub Jelinek wrote:

Hi!

For -mstack-arg-probe we push %rax and/or %r10 in the prologue, and
mark that insn as RTX_FRAME_RELATED_P.  But that means that the dwarf2 pass
also considers that the %rax/%r10 registers, which are call used, to be
saved in the unwind info, but they are never restored, which makes the
dwarf2 pass ICE on it.  Fixed by letting the dwarf2 pass know just that
those instructions decrease stack pointer.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2015-01-12  Jakub Jelinek  <jakub@redhat.com>

	PR target/64513
	* config/i386/i386.c (ix86_expand_prologue): Add
	REG_FRAME_RELATED_EXPR to %rax and %r10 pushes.

	* gcc.target/i386/pr64513.c: New test.

OK.
jeff

References:
- [PATCH] Fix -mstack-arg-probe (PR target/64513)
  - From: Jakub Jelinek

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