[Bug target/44578] GCC generates MMX instructions but fails to generate "emms"

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44578



--- Comment #8 from Uros Bizjak <ubizjak at gmail dot com> 2013-04-29 17:13:30 
UTC ---

Please try following patch, it fixes the testcase for me (note "!" for ?*y

alternative):



--cut here--

Index: i386.md

===================================================================

--- i386.md     (revision 198401)

+++ i386.md     (working copy)

@@ -3049,10 +3049,10 @@



 (define_insn "*zero_extendsidi2"

   [(set (match_operand:DI 0 "nonimmediate_operand"

-                       "=r,?r,?o,r   ,o,?*Ym,?*y,?*Yi,?*x")

+                       "=r,?r,?o,r   ,o,?*Ym,?!*y,?*Yi,?*x")

        (zero_extend:DI

         (match_operand:SI 1 "x86_64_zext_operand"

-                       "0 ,rm,r ,rmWz,0,r   ,m  ,r   ,m")))]

+                       "0 ,rm,r ,rmWz,0,r   ,m   ,r   ,m")))]

   ""

 {

   switch (get_attr_type (insn))

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