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PPC GCC Inline assembly help


Hello,

I'm using GCC inline assembly on PowerPc.

Below codes is works :

int reg_gpr()
{
int Rx = 0;
	__asm__ (
		"mr 31,%0\n"
		:
		:"i"(Rx)
		);
}

But not with this one : 

reg_gpr(0);
int reg_gpr(int Rx)
{
	__asm__ (
		"mr 31,%0\n"
		:
		:"i"(Rx)
		);
}

It will send error messages "impossible constraints in asm"
Is there any other method to modify Rx value from outside functions? 

thanks,

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