diff --git a/asm/non_matching/common/sub_0801E31C.inc b/asm/non_matching/common/sub_0801E31C.inc
deleted file mode 100644
index 5ba7e20e..00000000
--- a/asm/non_matching/common/sub_0801E31C.inc
+++ /dev/null
@@ -1,189 +0,0 @@
-    .syntax unified
-	push {r4, r5, r6, r7, lr}
-	mov r7, sl
-	mov r6, sb
-	mov r5, r8
-	push {r5, r6, r7}
-	sub sp, #0x20
-	str r0, [sp]
-	str r1, [sp, #4]
-	mov sl, r2
-	mov sb, r3
-	ldr r0, _0801E3AC @ =gUnk_03003DE4
-	ldrb r1, [r0]
-	lsls r0, r1, #2
-	adds r0, r0, r1
-	lsls r0, r0, #9
-	ldr r1, _0801E3B0 @ =gUnk_02017AA0
-	adds r0, r0, r1
-	movs r1, #0xa0
-	lsls r1, r1, #4
-	bl MemClear
-	cmp sl, sb
-	bge _0801E3DC
-	movs r6, #0
-	mov r8, sl
-	mov r7, r8
-	mov r0, r8
-	lsls r1, r0, #1
-	movs r0, #3
-	subs r5, r0, r1
-	cmp r6, r8
-	ble _0801E35E
-	b _0801E45E
-_0801E35E:
-	mov r1, r8
-	lsls r0, r1, #2
-	ldr r4, _0801E3B4 @ =gUnk_02018EE0
-	adds r0, r0, r4
-	str r0, [sp, #0x10]
-	mov r1, sb
-	mov r0, r8
-	muls r0, r1, r0
-	str r0, [sp, #0x14]
-	movs r3, #0
-_0801E372:
-	adds r0, r3, #0
-	mov r1, sl
-	str r3, [sp, #0x18]
-	bl Div
-	adds r4, r0, #0
-	lsls r4, r4, #0x10
-	lsrs r4, r4, #0x10
-	str r4, [sp, #0x1c]
-	ldr r0, [sp, #0x14]
-	mov r1, sl
-	bl Div
-	lsls r0, r0, #0x10
-	lsrs r0, r0, #0x10
-	lsls r2, r6, #2
-	ldr r4, _0801E3B4 @ =gUnk_02018EE0
-	adds r1, r2, r4
-	str r0, [r1]
-	ldr r0, [sp, #0x1c]
-	ldr r1, [sp, #0x10]
-	str r0, [r1]
-	ldr r3, [sp, #0x18]
-	cmp r5, #0
-	bge _0801E3B8
-	adds r0, r5, #6
-	adds r5, r0, r2
-	b _0801E3D2
-	.align 2, 0
-_0801E3AC: .4byte gUnk_03003DE4
-_0801E3B0: .4byte gUnk_02017AA0
-_0801E3B4: .4byte gUnk_02018EE0
-_0801E3B8:
-	adds r1, r5, #0
-	adds r1, #0xa
-	subs r0, r6, r7
-	lsls r0, r0, #2
-	adds r5, r1, r0
-	ldr r4, [sp, #0x10]
-	subs r4, #4
-	str r4, [sp, #0x10]
-	ldr r0, [sp, #0x14]
-	mov r1, sb
-	subs r0, r0, r1
-	str r0, [sp, #0x14]
-	subs r7, #1
-_0801E3D2:
-	add r3, sb
-	adds r6, #1
-	cmp r6, r7
-	ble _0801E372
-	b _0801E45E
-_0801E3DC:
-	movs r6, #0
-	mov r8, sb
-	mov r7, r8
-	mov r4, r8
-	lsls r1, r4, #1
-	movs r0, #3
-	subs r5, r0, r1
-	cmp r6, r8
-	bgt _0801E45E
-	lsls r0, r4, #2
-	ldr r1, _0801E438 @ =gUnk_02018EE0
-	adds r0, r0, r1
-	str r0, [sp, #8]
-	mov r0, sl
-	mov r4, r8
-	muls r4, r0, r4
-	str r4, [sp, #0xc]
-	movs r3, #0
-_0801E400:
-	adds r0, r3, #0
-	mov r1, sb
-	str r3, [sp, #0x18]
-	bl Div
-	adds r4, r0, #0
-	lsls r4, r4, #0x10
-	lsrs r4, r4, #0x10
-	str r4, [sp, #0x1c]
-	ldr r0, [sp, #0xc]
-	mov r1, sb
-	bl Div
-	lsls r0, r0, #0x10
-	lsrs r0, r0, #0x10
-	lsls r2, r6, #2
-	ldr r4, _0801E438 @ =gUnk_02018EE0
-	adds r1, r2, r4
-	str r0, [r1]
-	ldr r0, [sp, #0x1c]
-	ldr r1, [sp, #8]
-	str r0, [r1]
-	ldr r3, [sp, #0x18]
-	cmp r5, #0
-	bge _0801E43C
-	adds r0, r5, #6
-	adds r5, r0, r2
-	b _0801E456
-	.align 2, 0
-_0801E438: .4byte gUnk_02018EE0
-_0801E43C:
-	adds r1, r5, #0
-	adds r1, #0xa
-	subs r0, r6, r7
-	lsls r0, r0, #2
-	adds r5, r1, r0
-	ldr r4, [sp, #8]
-	subs r4, #4
-	str r4, [sp, #8]
-	ldr r0, [sp, #0xc]
-	mov r1, sl
-	subs r0, r0, r1
-	str r0, [sp, #0xc]
-	subs r7, #1
-_0801E456:
-	add r3, sl
-	adds r6, #1
-	cmp r6, r7
-	ble _0801E400
-_0801E45E:
-	ldr r0, [sp]
-	ldr r1, [sp, #4]
-	mov r2, r8
-	bl sub_0801E290
-	ldr r0, _0801E48C @ =gUnk_03003DE4
-	ldrb r1, [r0]
-	lsls r0, r1, #2
-	adds r0, r0, r1
-	lsls r0, r0, #9
-	ldr r1, _0801E490 @ =gUnk_02017AA0
-	adds r0, r0, r1
-	ldr r1, _0801E494 @ =0x04000040
-	ldr r2, _0801E498 @ =0xA2600001
-	bl SetVBlankDMA
-	add sp, #0x20
-	pop {r3, r4, r5}
-	mov r8, r3
-	mov sb, r4
-	mov sl, r5
-	pop {r4, r5, r6, r7, pc}
-	.align 2, 0
-_0801E48C: .4byte gUnk_03003DE4
-_0801E490: .4byte gUnk_02017AA0
-_0801E494: .4byte 0x04000040
-_0801E498: .4byte 0xA2600001
-    .syntax divided
diff --git a/src/common.c b/src/common.c
index 06cb3def..e05db3ee 100644
--- a/src/common.c
+++ b/src/common.c
@@ -898,7 +898,62 @@ void sub_0801E290(u32 param_1, u32 param_2, u32 count) {
     }
 }
 
-ASM_FUNC("asm/non_matching/common/sub_0801E31C.inc", void sub_0801E31C(u32 a1, u32 a2, u32 a3, u32 a4));
+void sub_0801E31C(u32 sp00, u32 sp04, s32 r10, s32 r9) {
+    u16 sp1c, sp1c2;
+    u16 kk, kk2;
+    u16 uVar2;
+    s32 r5;
+    s32 r6;
+    s32 r7;
+    s32 r8; // the lower one of param3 and param4
+
+    MemClear(&gUnk_02017AA0[gUnk_03003DE4[0]], 0xa00);
+    if (r10 < r9) {
+        r6 = 0;
+        r7 = r8 = r10;
+        r5 = 3 - r8 * 2;
+
+        while (r6 <= r7) {
+            sp1c = Div(r9 * r6, r10);
+            kk = Div(r9 * r7, r10);
+            // TODO: Fix data type in declaration. There shouldn't be a need to cast this.
+            ((u32*)gUnk_02018EE0)[r6] = kk;
+            ((u32*)gUnk_02018EE0)[r7] = sp1c;
+            if (r5 < 0) {
+                r5 += 6 + r6 * 4;
+                r6++;
+            } else {
+                r5 += 10 + (r6 - r7) * 4;
+                r7--;
+                r6++;
+            }
+        }
+    } else {
+        r6 = 0;
+        r7 = r8 = r9;
+        r5 = 3 - r8 * 2;
+
+        while (r6 <= r7) {
+            sp1c2 = Div(r10 * r6, r9);
+            kk2 = Div(r10 * r7, r9);
+            // TODO: Fix data type in declaration. There shouldn't be a need to cast this.
+            ((u32*)gUnk_02018EE0)[r6] = kk2;
+            ((u32*)gUnk_02018EE0)[r7] = sp1c2;
+            if (r5 < 0) {
+                r5 += 6 + r6 * 4;
+                r6++;
+            } else {
+                r5 += 10 + (r6 - r7) * 4;
+                r7--;
+                r6++;
+            }
+        }
+    }
+    sub_0801E290(sp00, sp04, r8);
+    SetVBlankDMA((u16*)&gUnk_02017AA0[gUnk_03003DE4[0]], (u16*)REG_ADDR_WIN0H,
+                 ((DMA_ENABLE | DMA_START_HBLANK | DMA_16BIT | DMA_REPEAT | DMA_SRC_INC | DMA_DEST_RELOAD) << 16) +
+                     0x1);
+}
 
 void sub_0801E49C(s32 baseX, s32 baseY, s32 radius, u32 baseAngle) {
     u8* ptr2;