Re: moving v16sf reg with multiple sub-regs

[Dylan Cuthbert]

Ok, I think I found out why gen_subreg crashes here: (with gcc 3.3.3)
 if (byte % GET_MODE_SIZE (outermode)
     || byte >= GET_MODE_SIZE (innermode))
   abort ();
This check doesn't seem right to me  ;-)
I'll see what's in the latest cvs for this function.
Regards
Dylan
"Richard Sandiford" <[EMAIL PROTECTED]> wrote in message 
news:[EMAIL PROTECTED]
"Dylan Cuthbert" <[EMAIL PROTECTED]> writes:
   emit_move_insn( gen_rtx_SUBREG (V4SFmode, op0, 0  ), gen_rtx_MEM(
V4SFmode, src_reg ) );
   emit_move_insn( gen_rtx_SUBREG (V4SFmode, op0, 16 ), gen_rtx_MEM(
V4SFmode, plus_constant( src_reg, 16 ) ) );
   emit_move_insn( gen_rtx_SUBREG (V4SFmode, op0, 32 ), gen_rtx_MEM(
V4SFmode, plus_constant( src_reg, 32 ) ) );
   emit_move_insn( gen_rtx_SUBREG (V4SFmode, op0, 48 ), gen_rtx_MEM(
V4SFmode, plus_constant( src_reg, 48 ) ) );
Note that generating MEMs like this is a bad idea because it discards
alias information.  It's better to use functions like adjust_address
instead.
It's probably also better to use simplify_gen_subreg instead of
gen_rtx_SUBREG.
Richard