[Bug target/60207] Wrong TFmode check in construct_container

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60207

--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to H.J. Lu from comment #0)

> But we didn't remove mode == TFmode check in construct_container.

This check is benign. classify_argument will return:

    case TFmode:
      classes[0] = X86_64_SSE_CLASS;
      classes[1] = X86_64_SSEUP_CLASS;
      return 2;

and the check in construct_container is:

  if (n == 2
      && regclass[0] == X86_64_INTEGER_CLASS
      && regclass[1] == X86_64_INTEGER_CLASS
      && (mode == CDImode || mode == TImode || mode == TFmode)
      && intreg[0] + 1 == intreg[1])
    return gen_rtx_REG (mode, intreg[0]);

The above condition never triggers due to regclass checks.

So, you can remove TFmode check without harm. The patch is pre-approved for
mainline and release branches.
>From gcc-bugs-return-443627-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Feb 15 09:45:36 2014
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Subject: [Bug rtl-optimization/49847] [4.7/4.8/4.9 Regression] NULL deref in fold_rtx (prev_insn_cc0 == NULL)
Date: Sat, 15 Feb 2014 09:45:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idI847

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|richard.guenther at gmail dot com  |rguenth at gcc dot gnu.org,
                   |                            |stevenb.gcc at gmail dot com

--- Comment #27 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yeah, not sure how non-cc0 targets avoid this situation.  I wonder if there is
a suitable pre-reload pass to do such reloading (I'm not sure teaching reload
to do that is the best idea ...)