/* Reference to a group of bits within an object. Similar to COMPONENT_REF
except the position is given explicitly rather than via a FIELD_DECL.
Operand 0 is the structure or union expression;
- operand 1 is a tree giving the number of bits being referenced;
- operand 2 is a tree giving the position of the first referenced bit.
+ operand 1 is a tree giving the constant number of bits being referenced;
+ operand 2 is a tree giving the constant position of the first referenced bit.
The field can be either a signed or unsigned field;
BIT_FIELD_REF_UNSIGNED says which. */
DEFTREECODE (BIT_FIELD_REF, "bit_field_ref", tcc_reference, 3)