[Bug target/27390] [4.2 Regression] gcc.target/x86_64/abi/test_complex_returning.c execution fails at -O0

["bonzini at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from bonzini at gnu dot org  2006-05-29 07:24 -------
The problem is that regstack is wrong when it comes to handling
COMPLEX_FLOAT_MODEs.

To handle clobbers, it calls move_nan_to_stack_reg twice on the same insn.  But
the second call does *not* add a new insn, so we get only one flds instead of
two.

There is also something wrong in emit_pop_insn of a complex float, because if
we fix the above we get a

   flds .LC0
   flds .LC0
   fstp %st
   fstp %st(1)

which is still wrong: we should have two fstps to %st.

The solution is probably to emit two distinct clobbers with XFmode instead of
one with a complex mode.

Paolo


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27390