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cos(0) should be 1 #31

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john-blackburn opened this issue Sep 23, 2023 · 1 comment

john-blackburn commented Sep 23, 2023

f24/f24cos.z80 says cos(0)==0 in the comments. But cos(0)=1

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john-blackburn commented Sep 29, 2023 •

edited

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In my code I have changed the first few lines of this routine to

f24cos:
;cos(AHL) ==> AHL

;cos(0) == 1    ; fixed by JFB
  add a,a
  jr nz,f24cos_skip
  ld a,$3F ; 1.0
  ld hl,0
  ret

;cos(inf)==cos(NaN)==NaN
f24cos_skip:
  rrca
  cp $7F

:

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