Bsc: SCRATCH - for the scratch register in movsi_ie in the
fldi0 / fldi0 cases
C: Constants other than only CONST_INT (constraint len == 3)
- Css: signed 16 bit constant, literal or symbolic
- Csu: unsigned 16 bit constant, literal or symbolic
+ Css: signed 16-bit constant, literal or symbolic
+ Csu: unsigned 16-bit constant, literal or symbolic
Csy: label or symbol
Cpg: non-explicit constants that can be directly loaded into a general
purpose register in PIC code. like 's' except we don't allow