daniel tian <daniel.xnt...@gmail.com> writes: > when I build the libgcc2.c, an unrecognizable RTL exist. Its about subreg. > Here is the info: > > ../../../rice-gcc-4.3.0/libgcc/../gcc/libgcc2.c: In function '__mulvsi3': > ../../../rice-gcc-4.3.0/libgcc/../gcc/libgcc2.c:169: error: unrecognizable > insn: > (insn 24 26 25 3 ../../../rice-gcc-4.3.0/libgcc/../gcc/libgcc2.c:165 > (set (subreg:SI (reg:DI 47) 0) > (ashiftrt:SI (subreg:SI (reg/v:DI 36 [ w ]) 4) > (const_int 0 [0x0]))) -1 (expr_list:REG_NO_CONFLICT > (reg/v:DI 36 [ w ]) > (nil))) > ../../../rice-gcc-4.3.0/libgcc/../gcc/libgcc2.c:169: internal compiler > error: in extract_insn, at recog.c:1990 > > I could understand why subreg exist, but gcc supposed to deal with it. > I mean to remove the subreg operations.
Your operand predicates should accept subregs before reload. This will happen automatically if you use register_operand. Ian
