Decomp sub_02001AB0

asm/main_02001B0C.s

@@ -1,35 +1,8 @@
 	.include "asm/macros.inc"
-	.include "main_02001AB0.inc"
+	.include "main_02001B0C.inc"
 
 	.text
 
-	arm_func_start sub_02001AB0
-sub_02001AB0: ; 0x02001AB0
-	stmdb sp!, {r3, r4, r5, lr}
-	tst r0, #0x80000000
-	movne r2, #1
-	moveq r2, #0
-	tst r1, #0x80000000
-	and r4, r2, #0xff
-	movne r2, #1
-	moveq r2, #0
-	cmp r1, #0
-	and r5, r2, #0xff
-	mvneq r0, #0x80000000
-	ldmeqia sp!, {r3, r4, r5, pc}
-	cmp r0, #0
-	moveq r0, #0
-	ldmeqia sp!, {r3, r4, r5, pc}
-	cmp r4, #0
-	rsbne r0, r0, #0
-	cmp r5, #0
-	rsbne r1, r1, #0
-	bl sub_02001BB4
-	cmp r4, r5
-	rsbne r0, r0, #0
-	ldmia sp!, {r3, r4, r5, pc}
-	arm_func_end sub_02001AB0
-
 	arm_func_start UMultiplyByFixedPoint
 UMultiplyByFixedPoint: ; 0x02001B0C
 	stmdb sp!, {r3, r4, r5, lr}

include/main_02001A54.h

@@ -4,5 +4,6 @@
 #include "util.h"
 
 s32 MultiplyByFixedPoint(s32 x, s32 y);
+s32 sub_02001AB0(s32 x, s32 y);
 
 #endif //PMDSKY_MAIN_02001A54_H

main.lsf

@@ -19,7 +19,7 @@ Static main
 	Object src/main_020018D0.o
 	Object asm/main_02001A30.o
 	Object src/main_02001A54.o
-	Object asm/main_02001AB0.o
+	Object asm/main_02001B0C.o
 	Object src/main_0200224C.o
 	Object asm/main_020022C4.o
 	Object src/main_0200330C.o

src/main_02001A54.c

@@ -1,6 +1,7 @@
 #include "main_02001A54.h"
 
 extern s32 UMultiplyByFixedPoint(s32, s32);
+extern s32 sub_02001BB4(s32, s32);
 
 s32 MultiplyByFixedPoint(s32 x, s32 y)
 {
@@ -40,3 +41,42 @@ s32 MultiplyByFixedPoint(s32 x, s32 y)
     }
     return result;
 }
+
+s32 sub_02001AB0(s32 x, s32 y)
+{
+    s32 result;
+    bool8 xNeg;
+    bool8 yNeg;
+
+    // Same as checking if x < 0 and y < 0
+    if (x & 0x80000000) {
+        xNeg = TRUE;
+    } else {
+        xNeg = FALSE;
+    }
+    if (y & 0x80000000) {
+        yNeg = TRUE;
+    } else {
+        yNeg = FALSE;
+    }
+    
+    if (y == 0) {
+        return 0x7FFFFFFF;
+    }
+    if (x == 0) {
+        return 0;
+    }
+    
+    if (xNeg) {
+        x = -x;
+    }
+    if (yNeg) {
+        y = -y;
+    }
+    
+    result = sub_02001BB4(x, y);
+    if (xNeg != yNeg) {
+        result = -result;
+    }
+    return result;
+}