Page 176 - ARM 64 Bit Assembly Language

Abstract data types 163

124 /* wl_print_numerical prints a table showing the number */
125 /* of occurrences for each word, followed by the word, */
126 /* sorted in reverse order of occurence. */
127 void wl_print_numerical(wordlist *list)
128 {
129 printf("wl_print_numerical has not been implemented");
130 }

Listing 6.7 Makefile for the wordfreq program.
1 C_OBJS=wordfreq.o list.o
2 ASM_OBJS=
3 OBJS=$(C_OBJS) $(ASM_OBJS)
4
5 LFLAGS=-O2 -g
6 CFLAGS=-I. -O2 -g -Wall
7 SFLAGS=-I. -O2 -g -Wall
8 DEPENDFLAGS=-I. -M
9
10 wordfreq: $(OBJS)
11 gcc $(LFLAGS) -o wordfreq $(OBJS)
12
13 .S.o:
14 gcc $(SFLAGS) -c $<
15
16 .c.o:
17 gcc $(CFLAGS) -c $<
18
19 clean:
20 rm -f *.o *~ wordfreq
21
22 # make depend will create a file ".depend" with all the dependencies
23 depend:
24 rm -f .depend
25 $(CC) $(DEPENDFLAGS) $(C_OBJS:.o=.c) > .depend
26
27 # if we have a .depend file, include it
28 ifeq (.depend,$(wildcard .depend))
29 include .depend
30 endif

Suppose we wish to implement one of the functions from Listing 6.6 in AArch64 assembly
language. We would

1. delete the function from the C file,
2. create a new file with the assembly version of the function, and
3. modify the makefile so that the new file is included in the program.