A3. Real A4. Complex A6. Change of representation A3. Real A3D. Extended range XADD-S To provide single-precision floating-point arithmetic DXADD-D with an extended exponent range. XADJ-S To provide single-precision floating-point arithmetic DXADJ-D with an extended exponent range. XC210-S To provide single-precision floating-point arithmetic DXC210-D with an extended exponent range. XCON-S To provide single-precision floating-point arithmetic DXCON-D with an extended exponent range. XRED-S To provide single-precision floating-point arithmetic DXRED-D with an extended exponent range. XSET-S To provide single-precision floating-point arithmetic DXSET-D with an extended exponent range. A4. Complex A4A. Single precision CARG-C Compute the argument of a complex number. A6. Change of representation A6B. Base conversion R9PAK-S Pack a base 2 exponent into a floating point number. D9PAK-D R9UPAK-S Unpack a floating point number X so that X = Y*2**N. D9UPAK-D