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function Bit#(32) barrelRShift(Bit#(32) in, Bit#(5) sftSz, Bit#(1) sft_in);
	Bit#(32) s = signExtend(sft_in);
	if (sftSz[0] == 1) ret = {s[0], in[31: 1]};
	else ret = in;
	if (sftSz[0] == 1) ret = {s[1: 0], in[31: 2]};
	else ret = s0;
	if (sftSz[0] == 1) ret = {s[3: 0], in[31: 4]};
	else ret = s1;
	if (sftSz[0] == 1) ret = {s[7: 0], in[31: 8]};
	else ret = s2;
	if (sftSz[0] == 1) ret = {s[15: 0], in[31: 16]};
	else ret = s3;
	return s4;
endfunction