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.include "asm/macros.inc"
.include "constants/constants.inc"
.syntax unified
.text
thumb_func_start CheckBits
CheckBits: @ 0x08000F10
ldr r3, _08000F50 @ =ram_CheckBits
bx r3
// sum 3 drop probability vectors
thumb_func_start SumDropProbabilities
SumDropProbabilities: @ 0x08000F14
push {r4, r5, r6}
movs r4, #30 // vector addition for 16 shorts in reverse
_08000F18:
ldrsh r5, [r1, r4] // row 1
ldrsh r6, [r2, r4] // + row 2
adds r5, r6
ldrsh r6, [r3, r4] // + row 3
adds r5, r6
strh r5, [r0, r4] // store in output
subs r4, #2
bpl _08000F18
pop {r4, r5, r6}
bx lr
// sum 3 drop probabilities, clamp to 0, return scalar sum
thumb_func_start SumDropProbabilities2
SumDropProbabilities2: @ 0x08000F2C
push {r4, r5, r6, r7}
movs r4, #30
movs r7, #0 // sum
_08000F32:
ldrsh r5, [r1, r4] // row 1
ldrsh r6, [r2, r4] // + row 2
adds r5, r6
ldrsh r6, [r3, r4] // + row 3
adds r5, r6
bpl positive_drop_chance // clamp to 0
movs r5, #0
positive_drop_chance:
strh r5, [r0, r4] // store in output
adds r7, r5
subs r4, #2
bpl _08000F32
adds r0, r7, #0 // return sum
pop {r4, r5, r6, r7}
bx lr
.align 2, 0
_08000F50: .4byte ram_CheckBits
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