------- Comment #4 from ian at airs dot com 2007-02-12 18:45 -------
Tom Tromey helped me recreate this with a cross-compiler.
I'm currently testing this patch:
Index: lower-subreg.c
===================================================================
--- lower-subreg.c (revision 121769)
+++ lower-subreg.c (working copy)
@@ -711,6 +711,23 @@ resolve_simple_move (rtx set, rtx insn)
return insn;
}
+ /* It's possible for the code to use a subreg of a decomposed
+ register while forming an address. We need to handle that before
+ passing the address to emit_move_insn. We pass NULL_RTX as the
+ insn parameter to resolve_subreg_use because we can not validate
+ the insn yet. */
+ if (MEM_P (src) || MEM_P (dest))
+ {
+ int acg;
+
+ if (MEM_P (src))
+ for_each_rtx (&XEXP (src, 0), resolve_subreg_use, NULL_RTX);
+ if (MEM_P (dest))
+ for_each_rtx (&XEXP (dest, 0), resolve_subreg_use, NULL_RTX);
+ acg = apply_change_group ();
+ gcc_assert (acg);
+ }
+
/* If SRC is a register which we can't decompose, or has side
effects, we need to move via a temporary register. */
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30751
