1 files changed, 98 insertions, 0 deletions
diff --git a/asm/trig.s b/asm/trig.s
new file mode 100644
index 000000000..b20fa3fb2
--- /dev/null
+++ b/asm/trig.s
@@ -0,0 +1,98 @@
+	.include "asm/macros.inc"
+	.include "constants/constants.inc"
+
+	.syntax unified
+
+	.text
+
+	thumb_func_start sine
+@ s16 sine(s16 t, s16 amplitude)
+sine: @ 806F534
+	lsls r1, 16
+	asrs r1, 16
+	ldr r2, =gUnknown_08329F40
+	lsls r0, 16
+	asrs r0, 15
+	adds r0, r2
+	movs r2, 0
+	ldrsh r0, [r0, r2]
+	muls r0, r1
+	lsls r0, 8
+	asrs r0, 16
+	bx lr
+	.pool
+	thumb_func_end sine
+
+	thumb_func_start cosine
+@ s16 cosine(s16 t, s16 amplitude)
+cosine: @ 806F550
+	lsls r1, 16
+	asrs r1, 16
+	ldr r2, =gUnknown_08329F40
+	lsls r0, 16
+	asrs r0, 15
+	adds r0, 0x80
+	adds r0, r2
+	movs r2, 0
+	ldrsh r0, [r0, r2]
+	muls r0, r1
+	lsls r0, 8
+	asrs r0, 16
+	bx lr
+	.pool
+	thumb_func_end cosine
+
+	thumb_func_start sine2
+@ s16 sine2(u16 angle)
+sine2: @ 806F570
+	push {r4,r5,lr}
+	adds r5, r0, 0
+	lsls r5, 16
+	lsrs r5, 16
+	adds r0, r5, 0
+	movs r1, 0xB4
+	bl __umodsi3
+	adds r4, r0, 0
+	lsls r4, 16
+	lsrs r4, 16
+	adds r0, r5, 0
+	movs r1, 0xB4
+	bl __udivsi3
+	movs r1, 0x1
+	ands r0, r1
+	ldr r1, =gUnknown_0832A1C0
+	lsls r4, 1
+	adds r4, r1
+	ldrh r1, [r4]
+	cmp r0, 0
+	bne _0806F5A8
+	lsls r0, r1, 16
+	b _0806F5AC
+	.pool
+_0806F5A8:
+	lsls r0, r1, 16
+	negs r0, r0
+_0806F5AC:
+	asrs r0, 16
+	pop {r4,r5}
+	pop {r1}
+	bx r1
+	thumb_func_end sine2
+
+	thumb_func_start cosine2
+@ s16 cosine2(u16 angle)
+cosine2: @ 806F5B4
+	push {lr}
+	lsls r0, 16
+	movs r1, 0xB4
+	lsls r1, 15
+	adds r0, r1
+	lsrs r0, 16
+	bl sine2
+	lsls r0, 16
+	asrs r0, 16
+	pop {r1}
+	bx r1
+	thumb_func_end cosine2
+
+	.align 2, 0 @ Don't pad with nop.