Match 4 functions in math_util, do some tidying up of imports for math_util (#144)

* Match func_802B5450, func_802B5F00, func_802B71CC

* Match func_802B4FF8

Also do some import fixing

Signed-off-by: Taggerung <tyler.taggerung@gmail.com>

include/trig_tables.h

@@ -0,0 +1,25 @@
+#ifndef TRIG_TABLES_H
+#define TRIG_TABLES_H
+
+/*
+ * The sine and cosine tables overlap, but "#define gCosineTable (gSineTable +
+ * 0x400)" doesn't give expected codegen; gSineTable and gCosineTable need to
+ * be different symbols for code to match. Most likely the tables were placed
+ * adjacent to each other, and gSineTable cut short, such that reads overflow
+ * into gCosineTable.
+ *
+ * These kinds of out of bounds reads are undefined behavior, and break on
+ * e.g. GCC (which doesn't place the tables next to each other, and probably
+ * exploits array sizes for range analysis-based optimizations as well).
+ * Thus, for non-IDO compilers we use the standard-compliant version.
+ */
+extern f32 gSineTable[];
+#ifdef AVOID_UB
+#define gCosineTable (gSineTable + 0x400)
+#else
+extern f32 gCosineTable[];
+#endif
+
+extern s16 gArctanTable[];
+
+#endif

include/variables.h

@@ -108,6 +108,8 @@ extern s32  gActiveScreenMode; // D_800DC52C
 extern s32  D_800DC540;
 extern u16  D_800DC5FC;
 
+extern u16  D_80150112;
+
 extern u16  D_8015F890;
 
 extern u16  D_80162DD4[];