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References: <bug-42462-8535@http.gcc.gnu.org/bugzilla/>
Subject: [Bug tree-optimization/42462] [4.5 Regression] wrong-code with computed-goto
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------- Comment #3 from rguenth at gcc dot gnu dot org  2009-12-31 15:57 -------
-O1 -fipa-sra shows the problem as well.  We can see wrong (or rather missing)
cloning of static initializers:

;; Function void Foo< <template-parameter-1-1> >::exec2() [with
<template-parameter-1-1> = int] (_ZN3FooIiE5exec2Ev)

void Foo< <template-parameter-1-1> >::exec2() [with <template-parameter-1-1> =
int] (struct FooD.1756 * const thisD.1781)
{
  voidD.35 * gotovar.1D.1832;
  boolD.1631 D.1831;
  static voidD.35 * tableD.1795[2] = {&beginL.0, &endL.4};

<bb 2>:
  gotovar.1D.1832_1 = tableD.1795[0];
  goto gotovar.1D.1832_1;

beginL.0:

endL.4:
  return;

}


;; Function void Foo< <template-parameter-1-1> >::execute() [with
<template-parameter-1-1> = int] (_ZN3FooIiE7executeEv)

void Foo< <template-parameter-1-1> >::execute() [with <template-parameter-1-1>
= int] (struct FooD.1756 * const thisD.1783)
{
  static voidD.35 * tableD.1795[2] = {&beginL.0, &endL.4};
  voidD.35 * gotovar.1D.1845;
  static voidD.35 * tableD.1795[2] = {&beginL.0, &endL.4};

<bb 2>:
  gotovar.1D.1845_5 = tableD.1795[0];
  goto gotovar.1D.1845_5;

beginL.1:

endL.2:
  goto <bb 2>;

}

Hm.  Honza?  This looks like an issue with non-localized vars?


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jamborm at gcc dot gnu dot
                   |                            |org, hubicka at gcc dot gnu
                   |                            |dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2009-12-31 15:57:11
               date|                            |
            Summary|wrong-code with computed-   |[4.5 Regression] wrong-code
                   |goto                        |with computed-goto
   Target Milestone|---                         |4.5.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42462