diff --git a/packages/x86-2/iset/avx.inc b/packages/x86-2/iset/avx.inc
index 1e9aaa2..535c41e 100644
--- a/packages/x86-2/iset/avx.inc
+++ b/packages/x86-2/iset/avx.inc
@@ -1036,6 +1036,25 @@ macro AVX_512.single_source_instruction vex_mpw,evex_f,opcode,unit,dest,src
 	end if
 end macro
 
+macro AVX_512.single_source_instruction_imm8 vex_mpw,evex_f,opcode,unit,dest,src,aux
+	AVX_512.parse_k1z_operand@dest dest
+	AVX_512.parse_operand@src src
+	x86.parse_operand@aux aux
+	if @dest.type = 'mmreg' & (@src.type = 'mem' | @src.type = 'mmreg')
+		if @aux.size and not 1
+			err 'invalid operand size'
+		else if unit & ( @dest.size <> (unit-1) and not 15 + 16 | (@src.type = 'mem' & @src.size and not unit) )
+			err 'invalid operand size'
+		else if @src.size and not @dest.size & (unit = 0 | @src.type = 'mmreg')
+			err 'operand sizes do not match'
+		end if
+		@src.memsize = unit
+		AVX_512.store_instruction@src @dest.size,vex_mpw,evex_f,opcode,@dest.mask,@dest.rm,,1,@aux.imm
+	else
+		err 'invalid combination of operands'
+	end if
+end macro
+
 iterate <instr,opcode>, add,58h, mul,59h, sub,5Ch, div,5Eh
 
 	macro v#instr#pd? dest*,src*,src2*&