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Re: alpha haifa regression
- To: amylaar at cygnus dot co dot uk, law at cygnus dot com
- Subject: Re: alpha haifa regression
- From: meissner at cygnus dot com
- Date: Wed, 8 Oct 1997 07:29:48 -0400 (EDT)
- Cc: egcs at cygnus dot com, rth at cygnus dot com, wilson at cygnus dot com
| For __builtin_saveregs, we are talking about a stack slot, not a
| designated varargs flushback area.
| And in front of va_start, any C code might be placed. Hence, we may not
| make any assumptions that only the prologue is in front.
That is not correct. Expr.c has the following code in it to guarantee that
__builtin_saveregs is executed first (assuming there is some sort of blockage
in EXPAND_BUILTIN_SAVEREGS to preventt he scheduler from moving things around):
/* Put the sequence after the NOTE that starts the function.
If this is inside a SEQUENCE, make the outer-level insn
chain current, so the code is placed at the start of the
function. */
push_topmost_sequence ();
emit_insns_before (seq, NEXT_INSN (get_insns ()));
pop_topmost_sequence ();
return temp;