Hey I'm trying to convert this C code into ARMv8 however I'm having severe difficulty while...
Hey I'm trying to convert this C code into ARMv8 however I'm having severe difficulty while doing it. This is just for personal practice to develop my skills. Thank you!
// Code starts here
// This is a C language code below
#define FALSE 0
#define TRUE 1
struct coord {
int x, y;
};
struct size {
int width, length;
};
struct pyramid {
struct coord center;
struct size base;
int height;
int volume;
};
struct pyramid newPyramid(int width, int length, int height)
{
struct pyramid p;
p.center.x = 0;
p.center.y = 0;
p.base.width = width;
p.base.length = length;
p.height = height;
p.volume = (p.base.width * p.base.length * p.height) / 3;
return p;
}
void relocate(struct pyramid *p, int deltaX, int deltaY)
{
p->center.x += deltaX;
p->center.y += deltaY;
}
void expand(struct pyramid *p, int factor)
{
p->base.width *= factor;
p->base.length *= factor;
p->height *= factor;
p->volume = (p->base.width * p->base.length *
p->height) / 3;
}
void printPyramid(char *name, struct pyramid *p)
{
printf("Pyramid %s\n", name);
printf("\tCenter = (%d, %d)\n", p->center.x,
p->center.y);
printf("\tBase width = %d Base length = %d\n", p->base.width,
p->base.length);
printf("\tHeight = %d\n", p->height);
printf("\tVolume = %d\n\n", p->volume);
}
int equalSize(struct pyramid *p1, struct pyramid *p2)
{
int result = FALSE;
if (p1->base.width == p2->base.width) {
if (p1->base.length == p2->base.length) {
if (p1->height == p2->height) {
result = TRUE;
}
}
}
return result;
}
int main()
{
struct pyramid khafre, cheops;
khafre = newPyramid(10, 10, 9);
cheops = newPyramid(15, 15, 18);
printf("Initial pyramid values:\n");
printPyramid("khafre", &khafre);
printPyramid("cheops", &cheops);
if (!equalSize(&khafre, &cheops)) {
expand(&cheops, 9);
relocate(&cheops, 27, -10);
relocate(&khafre, -23, 17);
}
printf("\nNew pyramid values:\n");
printPyramid("khafre", &khafre);
printPyramid("cheops", &cheops);
}
Homework Answers
newPyramid:
push rbp
mov rbp, rsp
mov QWORD PTR [rbp-40], rdi
mov DWORD PTR [rbp-44], esi
mov DWORD PTR [rbp-48], edx
mov DWORD PTR [rbp-52], ecx
mov DWORD PTR [rbp-32], 0
mov DWORD PTR [rbp-28], 0
mov eax, DWORD PTR [rbp-44]
mov DWORD PTR [rbp-24], eax
mov eax, DWORD PTR [rbp-48]
mov DWORD PTR [rbp-20], eax
mov eax, DWORD PTR [rbp-52]
mov DWORD PTR [rbp-16], eax
mov edx, DWORD PTR [rbp-24]
mov eax, DWORD PTR [rbp-20]
imul edx, eax
mov eax, DWORD PTR [rbp-16]
imul eax, edx
movsx rdx, eax
imul rdx, rdx, 1431655766
shr rdx, 32
sar eax, 31
mov esi, edx
sub esi, eax
mov eax, esi
mov DWORD PTR [rbp-12], eax
mov rcx, QWORD PTR [rbp-40]
mov rax, QWORD PTR [rbp-32]
mov rdx, QWORD PTR [rbp-24]
mov QWORD PTR [rcx], rax
mov QWORD PTR [rcx+8], rdx
mov rax, QWORD PTR [rbp-16]
mov QWORD PTR [rcx+16], rax
mov rax, QWORD PTR [rbp-40]
pop rbp
ret
relocate:
push rbp
mov rbp, rsp
mov QWORD PTR [rbp-8], rdi
mov DWORD PTR [rbp-12], esi
mov DWORD PTR [rbp-16], edx
mov rax, QWORD PTR [rbp-8]
mov edx, DWORD PTR [rax]
mov eax, DWORD PTR [rbp-12]
add edx, eax
mov rax, QWORD PTR [rbp-8]
mov DWORD PTR [rax], edx
mov rax, QWORD PTR [rbp-8]
mov edx, DWORD PTR [rax+4]
mov eax, DWORD PTR [rbp-16]
add edx, eax
mov rax, QWORD PTR [rbp-8]
mov DWORD PTR [rax+4], edx
nop
pop rbp
ret
expand:
push rbp
mov rbp, rsp
mov QWORD PTR [rbp-8], rdi
mov DWORD PTR [rbp-12], esi
mov rax, QWORD PTR [rbp-8]
mov eax, DWORD PTR [rax+8]
imul eax, DWORD PTR [rbp-12]
mov edx, eax
mov rax, QWORD PTR [rbp-8]
mov DWORD PTR [rax+8], edx
mov rax, QWORD PTR [rbp-8]
mov eax, DWORD PTR [rax+12]
imul eax, DWORD PTR [rbp-12]
mov edx, eax
mov rax, QWORD PTR [rbp-8]
mov DWORD PTR [rax+12], edx
mov rax, QWORD PTR [rbp-8]
mov eax, DWORD PTR [rax+16]
imul eax, DWORD PTR [rbp-12]
mov edx, eax
mov rax, QWORD PTR [rbp-8]
mov DWORD PTR [rax+16], edx
mov rax, QWORD PTR [rbp-8]
mov edx, DWORD PTR [rax+8]
mov rax, QWORD PTR [rbp-8]
mov eax, DWORD PTR [rax+12]
imul edx, eax
mov rax, QWORD PTR [rbp-8]
mov eax, DWORD PTR [rax+16]
imul eax, edx
movsx rdx, eax
imul rdx, rdx, 1431655766
shr rdx, 32
sar eax, 31
sub edx, eax
mov rax, QWORD PTR [rbp-8]
mov DWORD PTR [rax+20], edx
nop
pop rbp
ret
.LC0:
.string "Pyramid %s\n"
.LC1:
.string "\tCenter = (%d, %d)\n"
.LC2:
.string "\tBase width = %d Base length = %d\n"
.LC3:
.string "\tHeight = %d\n"
.LC4:
.string "\tVolume = %d\n\n"
printPyramid:
push rbp
mov rbp, rsp
sub rsp, 16
mov QWORD PTR [rbp-8], rdi
mov QWORD PTR [rbp-16], rsi
mov rax, QWORD PTR [rbp-8]
mov rsi, rax
mov edi, OFFSET FLAT:.LC0
mov eax, 0
call printf
mov rax, QWORD PTR [rbp-16]
mov edx, DWORD PTR [rax+4]
mov rax, QWORD PTR [rbp-16]
mov eax, DWORD PTR [rax]
mov esi, eax
mov edi, OFFSET FLAT:.LC1
mov eax, 0
call printf
mov rax, QWORD PTR [rbp-16]
mov edx, DWORD PTR [rax+12]
mov rax, QWORD PTR [rbp-16]
mov eax, DWORD PTR [rax+8]
mov esi, eax
mov edi, OFFSET FLAT:.LC2
mov eax, 0
call printf
mov rax, QWORD PTR [rbp-16]
mov eax, DWORD PTR [rax+16]
mov esi, eax
mov edi, OFFSET FLAT:.LC3
mov eax, 0
call printf
mov rax, QWORD PTR [rbp-16]
mov eax, DWORD PTR [rax+20]
mov esi, eax
mov edi, OFFSET FLAT:.LC4
mov eax, 0
call printf
nop
leave
ret
equalSize:
push rbp
mov rbp, rsp
mov QWORD PTR [rbp-24], rdi
mov QWORD PTR [rbp-32], rsi
mov DWORD PTR [rbp-4], 0
mov rax, QWORD PTR [rbp-24]
mov edx, DWORD PTR [rax+8]
mov rax, QWORD PTR [rbp-32]
mov eax, DWORD PTR [rax+8]
cmp edx, eax
jne .L7
mov rax, QWORD PTR [rbp-24]
mov edx, DWORD PTR [rax+12]
mov rax, QWORD PTR [rbp-32]
mov eax, DWORD PTR [rax+12]
cmp edx, eax
jne .L7
mov rax, QWORD PTR [rbp-24]
mov edx, DWORD PTR [rax+16]
mov rax, QWORD PTR [rbp-32]
mov eax, DWORD PTR [rax+16]
cmp edx, eax
jne .L7
mov DWORD PTR [rbp-4], 1
.L7:
mov eax, DWORD PTR [rbp-4]
pop rbp
ret
.LC5:
.string "Initial pyramid values:"
.LC6:
.string "khafre"
.LC7:
.string "cheops"
.LC8:
.string "\nNew pyramid values:"
main:
push rbp
mov rbp, rsp
sub rsp, 96
lea rax, [rbp-96]
mov ecx, 9
mov edx, 10
mov esi, 10
mov rdi, rax
call newPyramid
mov rax, QWORD PTR [rbp-96]
mov rdx, QWORD PTR [rbp-88]
mov QWORD PTR [rbp-32], rax
mov QWORD PTR [rbp-24], rdx
mov rax, QWORD PTR [rbp-80]
mov QWORD PTR [rbp-16], rax
lea rax, [rbp-96]
mov ecx, 18
mov edx, 15
mov esi, 15
mov rdi, rax
call newPyramid
mov rax, QWORD PTR [rbp-96]
mov rdx, QWORD PTR [rbp-88]
mov QWORD PTR [rbp-64], rax
mov QWORD PTR [rbp-56], rdx
mov rax, QWORD PTR [rbp-80]
mov QWORD PTR [rbp-48], rax
mov edi, OFFSET FLAT:.LC5
call puts
lea rax, [rbp-32]
mov rsi, rax
mov edi, OFFSET FLAT:.LC6
call printPyramid
lea rax, [rbp-64]
mov rsi, rax
mov edi, OFFSET FLAT:.LC7
call printPyramid
lea rdx, [rbp-64]
lea rax, [rbp-32]
mov rsi, rdx
mov rdi, rax
call equalSize
test eax, eax
jne .L10
lea rax, [rbp-64]
mov esi, 9
mov rdi, rax
call expand
lea rax, [rbp-64]
mov edx, -10
mov esi, 27
mov rdi, rax
call relocate
lea rax, [rbp-32]
mov edx, 17
mov esi, -23
mov rdi, rax
call relocate
.L10:
mov edi, OFFSET FLAT:.LC8
call puts
lea rax, [rbp-32]
mov rsi, rax
mov edi, OFFSET FLAT:.LC6
call printPyramid
lea rax, [rbp-64]
mov rsi, rax
mov edi, OFFSET FLAT:.LC7
call printPyramid
mov eax, 0
leave
ret
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