* Loads the value of the constant expression 'expr' into register 'rn'
* using immediate instructions only. Use this when it's important not
* to reference other data (i.e. on ppc64 when the TOC pointer is not
* Loads the value of the constant expression 'expr' into register 'rn'
* using immediate instructions only. Use this when it's important not
* to reference other data (i.e. on ppc64 when the TOC pointer is not