Hi,

The definition of constraint 'X' allows all operands.
`X' - Any operand whatsoever is allowed.
However, invalid memory operands should not be valid input for 'X'.

Please find attached the patch "X_constraint.patch" which ignores 
invalid memory operands in constraint 'X'.

Fixes the ICE gcc.dg/torture/asm-subreg-1.c on aarch64.

Regression Tested on aarch64-elf. No new Regressions.

2012-12-12  Naveen H.S  <Naveen.Hurugalawadi@caviumnetworks.com>

	*recog.c (asm_operand_ok): Ignore invalid memory operands in
	constraint 'X'

Regards,
Naveen