[Bug target/36745] [4.4 Regression] ICE in gen_reg_rtx, at emit-rtl.c:868

krebbel at gcc dot gnu dot org gcc-bugzilla@gcc.gnu.org
Mon Jul 7 12:36:00 GMT 2008



------- Comment #3 from krebbel at gcc dot gnu dot org  2008-07-07 12:35 -------
The shorter testcase does not fail with -O2 -fPIC on GCC rev. 137553.

But I can confirm the ICE with the first example.  For large GOTs (>4k) we
rewrite a symbol reference as a GOTENT relocation in the LEGITIMIZE_ADDRESS
hook. A reference to the original SYM_REF stays as REG_EQUAL note. The note is
used by GCSE to propagate the SYM_REF directly into the asm operand. So the
legitimize_address hook is called for this operand during reload - since the
fix needs an additional pseudo it crashes.


-- 

krebbel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |krebbel at gcc dot gnu dot
                   |dot org                     |org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-07-07 12:35:23
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36745



More information about the Gcc-bugs mailing list