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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/59458] New: alternative 13 in *movsf_internal is mishandled
Date: Tue, 10 Dec 2013 21:06:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59458

            Bug ID: 59458
           Summary: alternative 13 in *movsf_internal is mishandled
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: ubizjak at gmail dot com

We have

(define_insn "*movsf_internal"
  [(set (match_operand:SF 0 "nonimmediate_operand"
          "=Yf*f,m   ,Yf*f,?r ,?m,v,v,v,m,?r,?Yi,!*y,!*y,!m,!r ,!*Ym")
        (match_operand:SF 1 "general_operand"
          "Yf*fm,Yf*f,G   ,rmF,rF,C,v,m,v,Yj,r  ,*y ,m  ,*y,*Yn,r"))]

alternative 13 is MMXMOV instruction to store "*y" to "!m".  But
alternative 13 gets the default mode, SF.  But MMXMOV is

    case TYPE_MMXMOV:
      switch (get_attr_mode (insn))
        {
        case MODE_DI:
          return "movq\t{%1, %0|%0, %1}";
        case MODE_SI:
          return "movd\t{%1, %0|%0, %1}";

        default:
          gcc_unreachable ();
        }

MODE_SF gets gcc_unreachable.  This patch:

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 7138868..aa2664f 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -3126,7 +3140,7 @@
        (const_string "1")
        (const_string "*")))
    (set (attr "mode")
-        (cond [(eq_attr "alternative" "3,4,9,10,14,15")
+        (cond [(eq_attr "alternative" "3,4,9,10,13,14,15")
          (const_string "SI")
            (eq_attr "alternative" "11")
          (const_string "DI")

sets mode to SI for alternative 13.