1 files changed, 51 insertions, 0 deletions
diff --git a/src/coordinateManager.s b/src/coordinateManager.s
new file mode 100644
index 0000000..4a46c9b
--- /dev/null
+++ b/src/coordinateManager.s
@@ -0,0 +1,51 @@
+# --------------------------------------------
+# FUNCTION: make_coordinate_buffer
+# PURPOSE : allocate memory for n coordinate tuples (16 bytes each)
+# INPUTS  : rdi = number of coordinates
+# OUTPUTS : rax = pointer to allocated coordinate buffer
+# CLOBBERS: rax, rdi, r11
+# --------------------------------------------
+
+.globl make_coordinate_buffer
+.type make_coordinate_buffer, @function
+make_coordinate_buffer:
+    imulq $16, %rdi       # multiply n by 16 
+    call allocate        # allocate total bytes
+    ret
+
+
+# --------------------------------------------
+# FUNCTION: build_pointer_buffer
+# PURPOSE : build a buffer of pointers to coordinate tuples
+# INPUTS  : rdi = coordinate buffer, rsi = number of tuples
+# OUTPUTS : rax = pointer buffer
+# CLOBBERS: rax, rcx, rdx, r8, r9
+# --------------------------------------------
+
+.globl build_pointer_buffer
+.type build_pointer_buffer, @function
+build_pointer_buffer:
+    movq %rdi, %r8              # save coordinate buffer pointer in r8
+    movq %rsi, %rax
+    imulq $8, %rax              # 1 pointer per coordinate / each pointer 8 bytes
+    movq %rax, %rdi             # argument for allocate
+    call allocate               # pointer buffer -> rax
+    movq %rax, %r9              # save pointer buffer in r9
+
+    movq $0, %rcx               # index = 0
+pointer_loop:
+    cmpq %rsi, %rcx             # # if rcx >= n, done
+    jge done
+
+    movq %rcx, %rdx
+    imulq $16, %rdx             # 16 byte jumps / every pair of coordinates = 8 bytes + 8 bytes
+    addq %r8, %rdx              # rdX = coord_buffer + offset
+    movq %rdx, (%r9,%rcx,8)     # store pointer in pointer buffer / 8 byte jumps here, every pointer is 8 bytes
+
+    incq %rcx
+    jmp pointer_loop
+
+done:
+    movq %r9, %rax           # return pointer buffer
+    ret
+