[Bug middle-end/29111] [4.2 Regression] FAIL: gcc.dg/torture/pr26565.c -O0 execution test

[danglin at gcc dot gnu dot org]

------- Comment #3 from danglin at gcc dot gnu dot org  2006-09-17 20:05 -------
There's a question in my mind as to whether we should always be
emitting a library call:

  /* When not optimizing, generate calls to library functions for a certain
     set of builtins.  */
  if (!optimize
      && !called_as_built_in (fndecl)
      && DECL_ASSEMBLER_NAME_SET_P (fndecl)
      && fcode != BUILT_IN_ALLOCA)
    return expand_call (exp, target, ignore);

The setting of DECL_ASSEMBLER_NAME doesn't seem to be entirely reliable.
We have in builtin_function:

  if (library_name)
    SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));

library_name is set for __builtin_memcpy but not for memcpy.

The difference in behavior between the 32-bit hpux targets and the
32-bit linux target arises because the hpux target defines ASM_OUTPUT_EXTERNAL.
So, the assembler name for memcpy gets set indirectly by assemble_external_real
and this causes expand_builtin to use the library routine.  Is this the
intended behavior?

Ok, back to looking at the linux SEGV.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29111