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Define 3-bit value when invalid

--- a/src/asm/asmy.y

+++ b/src/asm/asmy.y

@@ -1055,10 +1055,13 @@

 const_3bit	: const {

 			int32_t value = $1;

-			if ((value < 0) || (value > 7))

+

+			if ((value < 0) || (value > 7)) {

 				yyerror("Immediate value must be 3-bit");

-			else

+				$$ = 0;

+			} else {

 				$$ = value & 0x7;

+			}

 		}

 ;