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Optimize lower case range check #1

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Optimize lower case range check #1

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17 changes: 7 additions & 10 deletions string.z80
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Original file line number Diff line number Diff line change
Expand Up @@ -3,20 +3,17 @@ ConvertToUpper:
ConvertToUpper00:
ld a, (hl)
cp $0
jr z, ConvertToUpper03
jr z, ConvertToUpper02
cp 'a'
jr z, ConvertToUpper01
jr c, ConvertToUpper02
cp 'z'
jr z, ConvertToUpper01
jr nc, ConvertToUpper02
ConvertToUpper01:
sub a, 32
jr c, ConvertToUpper01
cp 'z'+1
jr nc, ConvertToUpper01
sub a,'a'-'A'
ld (hl), a
ConvertToUpper02:
ConvertToUpper01:
inc hl
jr ConvertToUpper00
ConvertToUpper03:
ConvertToUpper02:
pop hl
ret

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