[Bug target/49133] [4.6/4.7 Regression] modification of aliased __m128d miscompiles

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49133

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86-*-*
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.05.24 08:22:04
         AssignedTo|unassigned at gcc dot       |ubizjak at gmail dot com
                   |gnu.org                     |
   Target Milestone|---                         |4.6.1
            Summary|[4.6 Regression]            |[4.6/4.7 Regression]
                   |modification of aliased     |modification of aliased
                   |__m128d miscompiles         |__m128d miscompiles
     Ever Confirmed|0                           |1

--- Comment #1 from Uros Bizjak <ubizjak at gmail dot com> 2011-05-24 08:22:04 
UTC ---
Confirmed, proposed patch to sse2_loadhpd:

Index: sse.md
===================================================================
--- sse.md    (revision 174102)
+++ sse.md    (working copy)
@@ -4284,7 +4284,7 @@
    vmovhpd\t{%2, %1, %0|%0, %1, %2}
    unpcklpd\t{%2, %0|%0, %2}
    vunpcklpd\t{%2, %1, %0|%0, %1, %2}
-   shufpd\t{$1, %1, %0|%0, %1, 1}
+   shufpd\t{$0, %1, %0|%0, %1, 0}
    #
    #
    #"