参照元†
/* Structure used to describe the attributes of a REG in similar way as
mem_attrs does for MEM above. Note that the OFFSET field is calculated
in the same way as for mem_attrs, rather than in the same way as a
SUBREG_BYTE. For example, if a big-endian target stores a byte
object in the low part of a 4-byte register, the OFFSET field
will be -3 rather than 0. */
struct GTY((for_user)) reg_attrs {
tree decl; /* decl corresponding to REG. */
poly_int64 offset; /* Offset from start of DECL. */
};
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