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applym.s
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/*
Assembly realization of matrix convolution function;
Due to my skills it actually might be slower than optimized C version :(
*/
.global applym
.type applym, %function
// Offset in BMPImage structure
.equ data, 0
.equ width, 8
.equ height, 12
.equ channels, 16
.text
.align 2
/*
void applym(BMPImage *src, BMPImage *dst, const double m[3][3])
x0 - src
x1 - dst
x2 - m
*/
applym:
sub sp, sp, #16
stp x29, x30, [sp]
mov x29, sp
// i = 0
// mov x3, #0
mov x4, #0
ldrh w4, [x0, height]
sub x4, x4, #1
mov x3, #2
udiv x3, x4, x3
applym_i:
add x3, x3, #1
cmp x3, x4
bhs applym_end
// j = 0
mov x5, #0
mov x6, #0
ldr w6, [x0, width]
sub x6, x6, #1
applym_j:
add x5, x5, #1
cmp x5, x6
bhs applym_i
// c = 0
mov x7, #-1
mov x8, #0
ldr w8, [x0, channels]
applym_c:
add x7, x7, #1
cmp x7, x8
bhs applym_j
// check for alpha
cmp x7, #3
bhi applym_c
////////////////////////////////////////// CYCLE START //////////////////////////////////////////
// work with x9-x19
// px = 0
mov x9, #0
///////////////////////////////// TOP
// base = (i - 1) * src->width + (j - 1)
sub x10, x3, #1
mov x11, #0
ldr w11, [x0, width]
sub x12, x5, #1
madd x10, x10, x11, x12
// base * channels + c
madd x11, x10, x8, x7
// src->data[_]
ldr x12, [x0, data]
ldrb w11, [x12, x11]
ucvtf d0, w11
// _ * m[0][0]
ldr d1, [x2, #0]
fmul d0, d0, d1
// px += int(_)
fcvtmu x11, d0
add x9, x9, x11
////////////////////
// base += 1
add x10, x10, #1
// base * channels + c
madd x11, x10, x8, x7
// src->data[_]
ldr x12, [x0, data]
ldrb w11, [x12, x11]
ucvtf d0, w11
// _ * m[0][1]
ldr d1, [x2, #8]
fmul d0, d0, d1
// px += int(_)
fcvtmu x11, d0
add x9, x9, x11
////////////////////
// base += 1
add x10, x10, #1
// base * channels + c
madd x11, x10, x8, x7
// src->data[_]
ldr x12, [x0, data]
ldrb w11, [x12, x11]
ucvtf d0, w11
// _ * m[0][2]
ldr d1, [x2, #16]
fmul d0, d0, d1
// px += int(_)
fcvtmu x11, d0
add x9, x9, x11
///////////////////////////////// MIDDLE
// base - 2 + src->width
// or: base - 1 + (src->width - 1)
sub x10, x10, #1
add x10, x10, x6
// base * channels + c
madd x11, x10, x8, x7
// src->data[_]
ldr x12, [x0, data]
ldrb w11, [x12, x11]
ucvtf d0, w11
// _ * m[1][0]
ldr d1, [x2, #24]
fmul d0, d0, d1
// px += int(_)
fcvtmu x11, d0
add x9, x9, x11
////////////////////
// base += 1
add x10, x10, #1
// base * channels + c
madd x11, x10, x8, x7
// src->data[_]
ldr x12, [x0, data]
ldrb w11, [x12, x11]
ucvtf d0, w11
// _ * m[1][1]
ldr d1, [x2, #32]
fmul d0, d0, d1
// px += int(_)
fcvtmu x11, d0
add x9, x9, x11
////////////////////
// base += 1
add x10, x10, #1
// base * channels + c
madd x11, x10, x8, x7
// src->data[_]
ldr x12, [x0, data]
ldrb w11, [x12, x11]
ucvtf d0, w11
// _ * m[1][2]
ldr d1, [x2, #40]
fmul d0, d0, d1
// px += int(_)
fcvtmu x11, d0
add x9, x9, x11
///////////////////////////////// BOTTOM
// base - 2 + src->width
// or: base - 1 + (src->width - 1)
sub x10, x10, #1
add x10, x10, x6
// base * channels + c
madd x11, x10, x8, x7
// src->data[_]
ldr x12, [x0, data]
ldrb w11, [x12, x11]
ucvtf d0, w11
// _ * m[2][0]
ldr d1, [x2, #48]
fmul d0, d0, d1
// px += int(_)
fcvtmu x11, d0
add x9, x9, x11
////////////////////
// base += 1
add x10, x10, #1
// base * channels + c
madd x11, x10, x8, x7
// src->data[_]
ldr x12, [x0, data]
ldrb w11, [x12, x11]
ucvtf d0, w11
// _ * m[2][1]
ldr d1, [x2, #56]
fmul d0, d0, d1
// px += int(_)
fcvtmu x11, d0
add x9, x9, x11
////////////////////
// base += 1
add x10, x10, #1
// base * channels + c
madd x11, x10, x8, x7
// src->data[_]
ldr x12, [x0, data]
ldrb w11, [x12, x11]
ucvtf d0, w11
// _ * m[2][2]
ldr d1, [x2, #64]
fmul d0, d0, d1
// px += int(_)
fcvtmu x11, d0
add x9, x9, x11
///////////////////////////////// SET PX
// base = (i - 1) * dst->width + (j - 1)
sub x10, x3, #1
mov x11, #0
ldr w11, [x1, width]
sub x12, x5, #1
madd x10, x10, x11, x12
// base * dst->channels + c
mov x11, #0
ldr w11, [x1, channels]
madd x10, x10, x11, x7
// dst->data[_] = px
ldr x11, [x1, data]
strb w9, [x11, x10]
////////////////////////////////////////// CYCLE END //////////////////////////////////////////
b applym_c
applym_end:
ldp x29, x30, [sp]
add sp, sp, #16
ret
.size applym, .-applym