diff --git a/asm/non_matching/common/sub_0801E64C.inc b/asm/non_matching/common/sub_0801E64C.inc
deleted file mode 100644
index 03076c44..00000000
--- a/asm/non_matching/common/sub_0801E64C.inc
+++ /dev/null
@@ -1,72 +0,0 @@
-    .syntax unified
-	push {r4, r5, r6, r7, lr}
-	adds r5, r0, #0
-	adds r4, r1, #0
-	adds r6, r3, #0
-	ldr r7, _0801E6C4 @ =gUnk_02018EE0
-	cmp r4, #0
-	bge _0801E65E
-	cmp r6, #0
-	blt _0801E6C2
-_0801E65E:
-	cmp r4, #0x9f
-	ble _0801E666
-	cmp r6, #0x9f
-	bgt _0801E6C2
-_0801E666:
-	cmp r4, r6
-	ble _0801E676
-	adds r1, r4, #0
-	adds r4, r6, #0
-	adds r6, r1, #0
-	adds r1, r5, #0
-	adds r5, r2, #0
-	adds r2, r1, #0
-_0801E676:
-	cmp r4, r6
-	beq _0801E6C2
-	subs r0, r2, r5
-	lsls r0, r0, #0x10
-	subs r1, r6, r4
-	bl Div
-	adds r3, r0, #0
-	cmp r4, #0
-	bge _0801E694
-	rsbs r0, r4, #0
-	muls r0, r3, r0
-	asrs r0, r0, #0x10
-	adds r5, r5, r0
-	movs r4, #0
-_0801E694:
-	cmp r6, #0x9f
-	ble _0801E69A
-	movs r6, #0x9f
-_0801E69A:
-	lsls r2, r5, #0x10
-	lsls r0, r4, #1
-	adds r0, r0, r4
-	ldr r1, [sp, #0x14]
-	adds r0, r0, r1
-	lsls r0, r0, #2
-	adds r7, r0, r7
-_0801E6A8:
-	cmp r5, #0
-	bge _0801E6AE
-	movs r5, #0
-_0801E6AE:
-	cmp r5, #0xf0
-	ble _0801E6B4
-	movs r5, #0xf0
-_0801E6B4:
-	str r5, [r7]
-	adds r2, r2, r3
-	asrs r5, r2, #0x10
-	adds r4, #1
-	adds r7, #0xc
-	cmp r4, r6
-	ble _0801E6A8
-_0801E6C2:
-	pop {r4, r5, r6, r7, pc}
-	.align 2, 0
-_0801E6C4: .4byte gUnk_02018EE0
-    .syntax divided
diff --git a/src/common.c b/src/common.c
index 51b331c1..a9ef58d1 100644
--- a/src/common.c
+++ b/src/common.c
@@ -701,7 +701,43 @@ ASM_FUNC("asm/non_matching/common/sub_0801E31C.inc", void sub_0801E31C(u32 a1, u
 
 ASM_FUNC("asm/non_matching/common/sub_0801E49C.inc", void sub_0801E49C(u32 a1, u32 a2, u32 a3, u32 a4));
 
-ASM_FUNC("asm/non_matching/common/sub_0801E64C.inc", void sub_0801E64C(u32 a1, u32 a2, u32 a3, u32 a4, u32 a5));
+void sub_0801E64C(s32 param_1, s32 param_2, s32 param_3, s32 param_4, s32 param_5) {
+    s32 sVar1;
+    s32* ptr = (s32*)gUnk_02018EE0;
+    register s32 tmp asm("r1");
+
+    if ((0 <= param_2 || 0 <= param_4) && (param_2 < 0xa0 || (param_4 < 0xa0))) {
+        if (param_2 > param_4) {
+            SWAP(param_2, param_4, tmp);
+            SWAP(param_1, param_3, tmp);
+        }
+        if (param_2 != param_4) {
+            sVar1 = Div((param_3 - param_1) * 0x10000, param_4 - param_2);
+            if (param_2 < 0) {
+                param_1 += (sVar1 * -param_2) >> 0x10;
+                param_2 = 0;
+            }
+            if (0x9f < param_4) {
+                param_4 = 0x9f;
+            }
+            param_3 = param_1 << 0x10;
+            ptr += param_2 * 3 + param_5;
+            do {
+                if (param_1 < 0) {
+                    param_1 = 0;
+                }
+                if (0xf0 < param_1) {
+                    param_1 = 0xf0;
+                }
+                *ptr = param_1;
+                param_3 += sVar1;
+                param_1 = param_3 >> 0x10;
+                param_2++;
+                ptr += 3;
+            } while (param_2 <= param_4);
+        }
+    }
+}
 
 void sub_0801E6C8(u32 param_1) {
     u32 tmp;