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[Bug target/58901] vax bootstrap fails on subreg reload
- From: "martin at netbsd dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 31 Oct 2013 14:42:07 +0000
- Subject: [Bug target/58901] vax bootstrap fails on subreg reload
- Auto-submitted: auto-generated
- References: <bug-58901-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58901
--- Comment #4 from Martin Husemann <martin at netbsd dot org> ---
I got a quick lesson in addressing modes for vax ;-)
It seems the mode = HImode passed to the upper functions in the call stack is
the problem - with HImode we can only use index operands with a factor of 2,
but this rtx has a factor of 4.
The problem starts in alter_subreg(), where the call to adjust_address_1 is
done:
#6 0x002d1a06 in alter_subreg (xp=0x7f0e8bc8, final_p=true, 2131659720, 1)
at ../../gcc-4.8.2/gcc/final.c:3072
3072 *xp = adjust_address (y, GET_MODE (x), offset);
and x has (due to subreg) HImode:
(gdb) p debug_rtx(x)
(subreg:HI (mem/u/c:SI (plus:SI (mult:SI (reg/v:SI 0 %r0 [orig:81 count ] [81])
(const_int 4 [0x4]))
(symbol_ref:SI ("DECPOWERS") [flags 0x40] <var_decl 0x7f22fe60
DECPOWERS>)) [3 DECPOWERS S4 A32]) 0)
$12 = void
(gdb) p debug_rtx(y)
(mem/u/c:SI (plus:SI (mult:SI (reg/v:SI 0 %r0 [orig:81 count ] [81])
(const_int 4 [0x4]))
(symbol_ref:SI ("DECPOWERS") [flags 0x40] <var_decl 0x7f22fe60
DECPOWERS>)) [3 DECPOWERS S4 A32])