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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/64307] [5 Regression] ICE: verify_gimple failed: invalid argument to gimple call with -fPIC -fipa-icf
Date: Tue, 13 Jan 2015 10:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64307

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Init called for 2 items (100.00%).
  false returned: 'Unknown TREE code reached' (compare_operand:480)
  false returned: 'memory operands are different' (compare_gimple_assign:785)
  different statement for code: GIMPLE_ASSIGN (compare_bb:638):
_2 = REALPART_EXPR <a>;
_2 = REALPART_EXPR <a>;
  false returned: '' (equals_private:537)

surely latent (the above is without -fPIC).

Index: gcc/ipa-icf-gimple.c
===================================================================
--- gcc/ipa-icf-gimple.c        (revision 219520)
+++ gcc/ipa-icf-gimple.c        (working copy)
@@ -448,6 +448,8 @@ func_checker::compare_operand (tree t1,

        return return_with_debug (ret);
       }
+    case IMAGPART_EXPR:
+    case REALPART_EXPR:
     case ADDR_EXPR:
       {
        x1 = TREE_OPERAND (t1, 0);

makes them compare equal, but still no transform is done, even w/o -fPIC.

Note BIT_FIELD_REF handling is completely broken:

    case BIT_FIELD_REF:
      {
        ret = compare_decl (t1, t2);
        return return_with_debug (ret);
      }

???