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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/54063] [4.8 regression] on powerpc64 gcc 4.8 generates larger code for global variable accesses than gcc 4.7
Date: Sat, 21 Jul 2012 18:47:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54063

Mikael Pettersson <mikpe at it dot uu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amodra at gcc dot gnu.org

--- Comment #1 from Mikael Pettersson <mikpe at it dot uu.se> 2012-07-21 18:47:30 UTC ---
It's caused by Alan Modra's "rs6000 toc reference rtl again" change in r187699:
http://gcc.gnu.org/ml/gcc-cvs/2012-05/msg00696.html
http://gcc.gnu.org/ml/gcc-patches/2012-05/msg00006.html

Here's the diff in output from r187698 and r187699 on this test case:

--- glovar.s-r187698    2012-07-21 20:31:01.000000000 +0200
+++ glovar.s-r187699    2012-07-21 20:35:59.000000000 +0200
@@ -11,8 +11,9 @@
        .previous
        .type   lookup, @function
 .L.lookup:
+       addis 10,2,.LANCHOR0@toc@ha
        addis 8,2,.LANCHOR0@toc@ha
-       ld 9,.LANCHOR0@toc@l(8)
+       ld 9,.LANCHOR0@toc@l(10)
        addi 8,8,.LANCHOR0@toc@l
        cmpd 7,9,8
        bne 7,.L4