How to inform as optimize lw v0, VAR with the specified register?

Pan ruochen panruochen@gmail.com
Fri Jul 24 06:15:00 GMT 2009

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Dear All,

The mips assembler will optimize the following instruction
	lw v0, VAR
by producing two machine code
	lui at, BASE
	lw  v0, OFFSET(at)

But if in the context of interrupts or exceptions, the at register
can't be used before being saved on the stack. So I wonder if
there is any option to inform as to optimize with a specified register
like k0/k1, which can be used directly without being saved.


PRC
Jul 24, 2009

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