(gcc.info) RTL Declarations

 
 Declarations
 ============
 
    Declaration expression codes do not represent arithmetic operations
 but rather state assertions about their operands.
 
 `(strict_low_part (subreg:M (reg:N R) 0))'
      This expression code is used in only one context: as the
      destination operand of a `set' expression.  In addition, the
      operand of this expression must be a non-paradoxical `subreg'
      expression.
 
      The presence of `strict_low_part' says that the part of the
      register which is meaningful in mode N, but is not part of mode M,
      is not to be altered.  Normally, an assignment to such a subreg is
      allowed to have undefined effects on the rest of the register when
      M is less than a word.

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