Revert the following commit to work around a bootstrap comparison failure on
ARMv7, as reported at <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71399>.

commit f6ab85b7049a03962ea98924d00802da357a1ad3
Author: renlin <renlin@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Wed Dec 2 14:06:31 2015 +0000

    [PR67383][ARM][4.9]Backport of "Allow any register for DImode values in Thumb2"
    
    This partially fix PR67383. It allows the reload more flexibility to choose
    spilling pseudo registers.
    
    
    gcc/ChangeLog:
    
    2015-12-02  Renlin Li  <renlin.li@arm.com>
    
            Backport from mainline.
            2014-04-22  Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
    
            * config/arm/arm.c (arm_hard_regno_mode_ok): Loosen
            restrictions on core registers for DImode values in Thumb2.
    
    
    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_9-branch@231177 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 8ba6060..d9028a1 100644
--- b/gcc/config/arm/arm.c
+++ a/gcc/config/arm/arm.c
@@ -22624,19 +22624,12 @@
     }
 
   /* We allow almost any value to be stored in the general registers.
-     Restrict doubleword quantities to even register pairs in ARM state
-     so that we can use ldrd.  Do not allow very large Neon structure
-     opaque modes in general registers; they would use too many.  */
+     Restrict doubleword quantities to even register pairs so that we can
+     use ldrd.  Do not allow very large Neon structure opaque modes in
+     general registers; they would use too many.  */
   if (regno <= LAST_ARM_REGNUM)
-    {
-      if (ARM_NUM_REGS (mode) > 4)
-	  return FALSE;
-
-      if (TARGET_THUMB2)
-	return TRUE;
-
-      return !(TARGET_LDRD && GET_MODE_SIZE (mode) > 4 && (regno & 1) != 0);
-    }
+    return !(TARGET_LDRD && GET_MODE_SIZE (mode) > 4 && (regno & 1) != 0)
+      && ARM_NUM_REGS (mode) <= 4;
 
   if (regno == FRAME_POINTER_REGNUM
       || regno == ARG_POINTER_REGNUM)
id=4b807ef87c4634e8bea1431d47ee3df3b519145d'>COPYING</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/COPYING?id=4b807ef87c4634e8bea1431d47ee3df3b519145d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
82c8c30396725aaa350bfd12497cc&amp;showmsg=1'>guix-hash.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-hash.sh?id=2dfacc1d33b82c8c30396725aaa350bfd12497cc'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2020-09-28 21:06:36 -0500'>2020-09-28</span></td><td class='logsubject'><a href='/guix/commit/tests/guix-hash.sh?id=d8934360d2453a403b5433e71d09188e4ed23b57'>tests: Simplify shell exit status negation;</a></td><td>Eric Bavier</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* tests/guix-archive.sh, tests/guix-build-branch.sh, tests/guix-build.sh,
tests/guix-daemon.sh, tests/guix-download.sh, tests/guix-environment.sh,
tests/guix-gc.sh, tests/guix-git-authenticate.sh, tests/guix-graph.sh,
tests/guix-hash.sh, tests/guix-lint.sh, tests/guix-pack-relocatable.sh,
tests/guix-pack.sh, tests/guix-package-aliases.sh, tests/guix-package-net.sh,
tests/guix-package.sh: Use the shell '!' keyword to negate command exit status
in place of 'if ...; then false; else true; fi'


</td></tr>
<tr class='logheader'><td><span title='2020-05-22 00:35:24 +0200'>2020-05-22</span></td><td class='logsubject'><a href='/guix/commit/tests/guix-hash.sh?id=0e4e9c8e7655f3e2a9c2615923768d211ac02a3e'>guix hash, guix download: Support base64 format.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* guix/scripts/download.scm (show-help, %options): Support "base64"
format.
* guix/scripts/hash.scm (show-help, %options): Likewise.
* tests/guix-hash.sh: Test it.
* doc/guix.texi (Invoking guix hash): Document it.


</td></tr>
<tr class='logheader'><td><span title='2020-05-22 00:35:24 +0200'>2020-05-22</span></td><td class='logsubject'><a href='/guix/commit/tests/guix-hash.sh?id=18ae1ec3ecfe22d55d6cdf595a442afebbc5595a'>guix hash, guix download: Add '--hash'.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* guix/scripts/download.scm (%default-options): Add 'hash-algorithm'.
(show-help, %options): Add "--hash".
(guix-download): Honor it.
* guix/scripts/hash.scm (%default-options): Add 'hash-algorithm'.
(show-help, %options): Add "--hash".
(guix-hash): Honor it.
* tests/guix-hash.sh: Test '-H sha512'.
* doc/guix.texi (Invoking guix download): Document it.
(Invoking guix hash): Document it.


</td></tr>