I will try to be descriptive this time .
This is test.c
main()
{
int a,b,c;
a= 5;
b=10;
d=30;
c= a*b + 30 ;
}
now , suppose i build gcc for an ARM processor.
After build, compile stage ---
with no optimization options as mentioned above, this is what i get in
assembly.
.file "test1234.c"
.text
.align 2
.global main
.type main, %function
main:
@ args = 0, pretend = 0, frame = 16
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #16
mov r3, #5
str r3, [fp, #-28]
mov r3, #10
str r3, [fp, #-24]
mov r3, #30
str r3, [fp, #-16]
ldr r2, [fp, #-28]
ldr r3, [fp, #-24]
mul r1, r3, r2
mov r3, r1
mov r2, r3, asl #2
mov r3, r2, asl #5
rsb r3, r2, r3
add r3, r3, r1
mov r2, r3, asl #2
add r3, r3, r2
mov r3, r3, asl #4
add r3, r3, #299008
add r3, r3, #992
str r3, [fp, #-20]
sub sp, fp, #12
ldmfd sp, {fp, sp, pc}
.size main, .-main
--
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