Hello,
I'd like to get some help on a new port I'm trying to put together. The
problem seems to be in the reload phase (where else? :-) ).
The register 176 is spilled in the following instruction (dump just
before reload):
(insn 364 363 365 57 decode_macroblock.c:280 (set (mem:SI (plus:SI
(reg/v/f:SI 176 [ dc_dct_pred ])
(const_int 8 [0x8])) [0 S4 A32])
(const_int 0 [0x0])) 12 {movsi} (nil))
This changes the instruction to:
(insn 364 363 365 57 decode_macroblock.c:280 (set (mem:SI (plus:SI
(mem/f/c/i:SI (plus:SI (reg/f:SI 141 mac:AP)
(const_int 8 [0x8])) [0 dc_dct_pred+0 S4 A32])
(const_int 8 [0x8])) [0 S4 A32])
(const_int 0 [0x0])) 12 {movsi} (nil))
This fails the "legitimate address" constraint since I'm not allowing a
mem inside another mem.
Thus I get this error after the reload:
decode_macroblock.c:324: error: insn does not satisfy its constraints:
(insn 364 363 365 57 decode_macroblock.c:280 (set (mem:SI (plus:SI
(mem/f/c/i:SI (plus:SI (reg/f:SI 141 mac:AP)
(const_int 8 [0x8])) [0 dc_dct_pred+0 S4 A32])
(const_int 8 [0x8])) [0 S4 A32])
(const_int 0 [0x0])) 12 {movsi} (nil))
decode_macroblock.c:324: internal compiler error: in
reload_cse_simplify_operands, at postreload.c:395
The relevant part of the .md-file looks like this:
(define_mode_iterator GPR [HI SI QI])
(define_mode_attr size [(HI "c2") (SI "i") (QI "c")])
(define_insn "mov<mode>"
[(set (match_operand:GPR 0 "nonimmediate_operand" "=r,=m,=m,=r")
(match_operand:GPR 1 "general_operand" "m,r,i,g"))]
""
{
switch (which_alternative)
{
case 0:
return "ld_<size>\t%0 <- %1";
case 1:
return "st_<size>\t%0, %1";
case 2:
return "st_<size>\t%0, %1";
case 3:
return "mov\t%0 <- %1";
default:
gcc_unreachable();
}
}
)
What could be the problem? Where should I start looking?
I am using a checkout from the trunk from somewhere last week.
Thanks for the help,
Tom
