Example 1. Macro Definition, Call, and Expansion

Macro definition: The following code defines a macro, sadd4, with four parameters:

1 sadd4 .macro r1,r2,r3,r4 2 ! 3 ! sadd4 r1, r2 ,r3, r4 4 ! r1 = r1 + r2 + r3 + r4 (saturated) 5 ! 6 SADD r1,r2,r1 7 SADD r1,r3,r1 8 SADD r1,r4,r1 9 .endm

Macro call: The following code calls the sadd4 macro with four arguments:

10 11 00000000 sadd4 A0,A1,A2,A3

Macro expansion: The following code shows the substitution of the macro definition for the macro call. The assembler substitutes A0, A1, A2, and A3 for the r1, r2, r3, and r4 parameters of sadd4.

1 00000000 00040278 SADD A0,A1,A0 1 00000004 00080278 SADD A0,A2,A0 1 00000008 000C0278 SADD A0,A3,A0