[LLVMdev] tied registers

[Jonas Paulsson]

Hi,

I wonder if there is a simple way to define a 3-address instruction taking 4 operands, ie a 

32regA = MAC (32regB, 16regC, 16regD)  // widening mac instruction

Regs A and B should be handled like "src1 = dst", but this does not work, I get odd results.

I wonder also how to generally select instructions when the widths of the input operands differ like this.

Thanks,

Jonas

 		 	   		  
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