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ARCH_rtx_costs


Hi there,

When porting gcc to own arch, we need to prepare $ARCH_rtx_costs, like mips_rtx_costs.
I don't know how to calculate these costs.
How could I achieve it? 
Which reference do I need to refer to? I think there are few helps about it in GCC internals.
I need your help.

Regards,
Shinpei Kato


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