Code:
.file "Bresenham.c"
.text
.globl _Z9Bresenham8IPoint_tS_PFviiE
.def _Z9Bresenham8IPoint_tS_PFviiE; .scl 2; .type 32; .endef
.seh_proc _Z9Bresenham8IPoint_tS_PFviiE
_Z9Bresenham8IPoint_tS_PFviiE:
.LFB4:
pushq %rbp
.seh_pushreg %rbp
movq %rsp, %rbp
.seh_setframe %rbp, 0
subq $80, %rsp
.seh_stackalloc 80
.seh_endprologue
movq %rcx, 16(%rbp)
movq %rdx, 24(%rbp)
movq %r8, 32(%rbp)
movl 16(%rbp), %eax
movl %eax, -4(%rbp)
movl 20(%rbp), %eax
movl %eax, -8(%rbp)
movl 24(%rbp), %eax
movl %eax, -16(%rbp)
movl 28(%rbp), %eax
movl %eax, -20(%rbp)
movl -16(%rbp), %eax
subl -4(%rbp), %eax
movl %eax, %edx
movl %edx, %eax
sarl $31, %eax
xorl %eax, %edx
movl %edx, -24(%rbp)
subl %eax, -24(%rbp)
movl -4(%rbp), %eax
cmpl -16(%rbp), %eax
jge .L2
movl $1, %eax
jmp .L3
.L2:
movl $-1, %eax
.L3:
movl %eax, -28(%rbp)
movl -20(%rbp), %eax
subl -8(%rbp), %eax
movl %eax, %edx
movl %edx, %eax
sarl $31, %eax
xorl %eax, %edx
movl %edx, -32(%rbp)
subl %eax, -32(%rbp)
movl -8(%rbp), %eax
cmpl -20(%rbp), %eax
jge .L4
movl $1, %eax
jmp .L5
.L4:
movl $-1, %eax
.L5:
movl %eax, -36(%rbp)
movl -24(%rbp), %eax
cmpl -32(%rbp), %eax
jg .L6
movl -32(%rbp), %eax
negl %eax
movl %eax, %edx
shrl $31, %edx
addl %edx, %eax
sarl %eax
jmp .L7
.L6:
movl -24(%rbp), %eax
movl %eax, %edx
shrl $31, %edx
addl %edx, %eax
sarl %eax
.L7:
movl %eax, -12(%rbp)
.L12:
movl -8(%rbp), %edx
movl -4(%rbp), %ecx
movq 32(%rbp), %rax
call *%rax
movl -4(%rbp), %eax
cmpl -16(%rbp), %eax
jne .L8
movl -8(%rbp), %eax
cmpl -20(%rbp), %eax
je .L14
.L8:
movl -12(%rbp), %eax
movl %eax, -40(%rbp)
movl -24(%rbp), %eax
negl %eax
cmpl -40(%rbp), %eax
jge .L10
movl -32(%rbp), %eax
subl %eax, -12(%rbp)
movl -28(%rbp), %eax
addl %eax, -4(%rbp)
.L10:
movl -40(%rbp), %eax
cmpl -32(%rbp), %eax
jge .L12
movl -24(%rbp), %eax
addl %eax, -12(%rbp)
movl -36(%rbp), %eax
addl %eax, -8(%rbp)
jmp .L12
.L14:
nop
nop
addq $80, %rsp
popq %rbp
ret
.seh_endproc
.ident "GCC: (tdm64-1) 5.1.0"
Code:
.arch armv6
.eabi_attribute 27, 3
.eabi_attribute 28, 1
.fpu vfp
.eabi_attribute 20, 1
.eabi_attribute 21, 1
.eabi_attribute 23, 3
.eabi_attribute 24, 1
.eabi_attribute 25, 1
.eabi_attribute 26, 2
.eabi_attribute 30, 6
.eabi_attribute 34, 1
.eabi_attribute 18, 4
.file "Bresenham.c"
.text
.align 2
.global Bresenham
.type Bresenham, %function
Bresenham:
@ args = 4, pretend = 0, frame = 56
@ frame_needed = 1, uses_anonymous_args = 0
stmfd sp!, {fp, lr}
add fp, sp, #4
sub sp, sp, #56
sub ip, fp, #52
stmia ip, {r0, r1}
sub r1, fp, #60
stmia r1, {r2, r3}
ldr r3, [fp, #-52]
str r3, [fp, #-8]
ldr r3, [fp, #-48]
str r3, [fp, #-12]
ldr r3, [fp, #-60]
str r3, [fp, #-20]
ldr r3, [fp, #-56]
str r3, [fp, #-24]
ldr r2, [fp, #-20]
ldr r3, [fp, #-8]
rsb r3, r3, r2
cmp r3, #0
rsblt r3, r3, #0
str r3, [fp, #-28]
ldr r2, [fp, #-8]
ldr r3, [fp, #-20]
cmp r2, r3
bge .L2
mov r3, #1
b .L3
.L2:
mvn r3, #0
.L3:
str r3, [fp, #-32]
ldr r2, [fp, #-24]
ldr r3, [fp, #-12]
rsb r3, r3, r2
cmp r3, #0
rsblt r3, r3, #0
str r3, [fp, #-36]
ldr r2, [fp, #-12]
ldr r3, [fp, #-24]
cmp r2, r3
bge .L4
mov r3, #1
b .L5
.L4:
mvn r3, #0
.L5:
str r3, [fp, #-40]
ldr r2, [fp, #-28]
ldr r3, [fp, #-36]
cmp r2, r3
bgt .L6
ldr r3, [fp, #-36]
rsb r3, r3, #0
mov r2, r3, lsr #31
add r3, r2, r3
mov r3, r3, asr #1
b .L7
.L6:
ldr r3, [fp, #-28]
mov r2, r3, lsr #31
add r3, r2, r3
mov r3, r3, asr #1
.L7:
str r3, [fp, #-16]
.L12:
ldr r3, [fp, #4]
ldr r0, [fp, #-8]
ldr r1, [fp, #-12]
blx r3
ldr r2, [fp, #-8]
ldr r3, [fp, #-20]
cmp r2, r3
bne .L8
ldr r2, [fp, #-12]
ldr r3, [fp, #-24]
cmp r2, r3
bne .L8
b .L13
.L8:
ldr r3, [fp, #-16]
str r3, [fp, #-44]
ldr r3, [fp, #-28]
rsb r2, r3, #0
ldr r3, [fp, #-44]
cmp r2, r3
bge .L10
ldr r2, [fp, #-16]
ldr r3, [fp, #-36]
rsb r3, r3, r2
str r3, [fp, #-16]
ldr r2, [fp, #-8]
ldr r3, [fp, #-32]
add r3, r2, r3
str r3, [fp, #-8]
.L10:
ldr r2, [fp, #-44]
ldr r3, [fp, #-36]
cmp r2, r3
bge .L11
ldr r2, [fp, #-16]
ldr r3, [fp, #-28]
add r3, r2, r3
str r3, [fp, #-16]
ldr r2, [fp, #-12]
ldr r3, [fp, #-40]
add r3, r2, r3
str r3, [fp, #-12]
.L11:
b .L12
.L13:
sub sp, fp, #4
@ sp needed
ldmfd sp!, {fp, pc}
.size Bresenham, .-Bresenham
.ident "GCC: (Raspbian 4.9.2-10+deb8u1) 4.9.2"
.section .note.GNU-stack,"",%progbits
BTW: Du kannst mal zum Spielen im BresenhamTest die sum aus dem Callback mit als Ergebnis ausgeben lassen. Daran sieht man zumindest, dass der Algorithmus was tut und nicht wegoptimiert wird.
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