Unreviewed patch

[Richard Sandiford <rsandifo at redhat dot com>]

This one didn't get a review:

    http://gcc.gnu.org/ml/gcc-patches/2003-06/msg02768.html

It's the trunk version of:

    http://gcc.gnu.org/ml/gcc-patches/2003-06/msg02766.html

OK to install?

One thing I forgot to mention in the covering note was that:

	  /* va_arg is an array access in this case, which causes
	     it to get MEM_IN_STRUCT_P set.  We must set it here
	     so that the insn scheduler won't assume that these
	     stores can't possibly overlap with the va_arg loads.  */
	  if (mips_abi != ABI_EABI && BYTES_BIG_ENDIAN)
	    MEM_SET_IN_STRUCT_P (mem, 1);

(which dates back to '96) seems bogus.  Looking at the rtl dumps, va_arg
loads don't have MEM_IN_STRUCT_P set for any combination that I can see.
Certainly not for -mabi=n32 and -mabi=64 on irix (which is a big endian
target).  Having them only on the stores, not the loads, seems dangerous.

Richard