Line 16: | Line 16: | ||
<asm> | <asm> | ||
− | ;;-- generation of _main function | + | ;;-- generation of the "_main" function |
TEXT | TEXT | ||
ALIGN | ALIGN |
The following pure-Postfix program illustrates duplication of double-precision floating point numbers on the stack.
The C equivalent would be (roughly):
<c> int main() {
extern void printd(double); double d, e; d = e = 3.3e-2; printd(d + e); return 0;
} </c>
Note that this program's code does not necessarily correspond to any particular code generator output.
<asm>
TEXT ALIGN GLOBL _main, FUNC LABEL _main ENTER 16 ; d@-8 and e@-16
RODATA ALIGN LABEL _L123 DOUBLE 3.3e-2
TEXT ADDR _L123 LOAD2
SP LOAD2
LOCA -16 ; write value to "e"
SP LOAD2
LOCA -8 ; write value to "d"
TRASH 8
LOCV -8 ; load "d" LOCV -16 ; load "e" DADD ; leaves result on the stack
EXTRN printd CALL printd
TRASH 8 ; argument value no longer needed
INT 0 POP LEAVE RET </asm>
Assuming that the code above is in file dbl.pf, the following commands would compile and run the program: