Critical Hit Calculation

No Parameters  - Returns nothing
 
Roll critical Hit (4%)
  - If Successful : Increase XA (to a random from 100% to 200% of initial value)
  - Knock Target back if possible
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001864f8: 27bdffe0 addiu r29,r29,-0x0020    |
001864fc: afbf0018 sw r31,0x0018(r29)       |
00186500: 34040064 ori r4,r0,0x0064         |r4 = 0x64 (100)
00186504: 0c063bb6 jal 0x0018eed8           |-->Random Process  Return r2 = 0x00 if Critical Hit
00186508: 34050004 ori r5,r0,0x0004         |r5 = 0x04 
0018650c: 14400012 bne r2,r0,0x00186558     #If Critical Hit
00186510: 34030001 ori r3,r0,0x0001         |r3 = 0x01 r3 = 1
00186514: 3c028019 lui r2,0x8019                |
00186518: 8c422d90 lw r2,0x2d90(r2)             |r2 = Target Current Action Data Pointer
0018651c: 0c063ba8 jal 0x0018eea0               |-->Random Process, gives a number between 0-7fff r2 = Value between 0x00 and 0x7fff
00186520: a0430001 sb r3,0x0001(r2)             |Store Critical Hit Flag (TCA 0x01)
00186524: 3c048019 lui r4,0x8019                |
00186528: 248438ce addiu r4,r4,0x38ce           |r4 = Ability XA pointer  0x80198ce / 801938ce
0018652c: 84830000 lh r3,0x0000(r4)             |r3 = Ability XA
00186530: 00000000 nop                          |
00186534: 00430018 mult r2,r3                   |XA * Random
00186538: 00001012 mflo r2                      |r2 = XA * Random
0018653c: 04410002 bgez r2,0x00186548           #If Random*XA < 0x00
00186540: 00000000 nop                              |
00186544: 24427fff addiu r2,r2,0x7fff               |r2 = Positive Random * XA
00186548: 000213c3 sra r2,r2,0x0f               |r2 = Random Between 0x00 and XA  (XA * Random / Maximum possible random (0x8000))
0018654c: 00621021 addu r2,r3,r2                |XA + Random (from 0x00 to XA)
00186550: 0c0610fb jal 0x001843ec               |-->Knockback Calculation Check Knockback usability - Set some flags if ok
00186554: a4820000 sh r2,0x0000(r4)             |Store new XA (100% to 200% of Initial XA)
00186558: 8fbf0018 lw r31,0x0018(r29)       END
0018655c: 27bd0020 addiu r29,r29,0x0020        
00186560: 03e00008 jr r31                      
00186564: 00000000 nop

Return location

Battle.bin
001886bc: Damage_Calculation
00189d10: 31 Dmg_((PA+Y)/2*PA)
00189dac: 32 Dmg_(Rdm(1…X)*(PA*3+Y))