Changeset 181 in xtideuniversalbios for trunk/Assembly_Library/Src/String

Timestamp:

Nov 13, 2011, 3:38:40 PM (13 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes to all parts of the project:

• Size optimizations.
• Added a define (EXCLUDE_FROM_XTIDECFG) to exclude unused library code from XTIDECFG.
• Tried to minimize time spent with interrupts disabled.
• Some minor attempts to improve speed (reordering instructions etc).
• Tried to improve readability, did some cleanup and fixed some errors in comments.

File:

• trunk/Assembly_Library/Src/String/Char.asm (modified) (2 diffs)

trunk/Assembly_Library/Src/String/Char.asm

@@ -161 +161 @@
 Char_ALtoLowerCaseLetter:
     call    Char_IsUpperCaseLetterInAL  ; Is upper case character?
-    jnc     SHORT .Return               ;  If not, return
-    add     al, 'a'-'A'                 ; Convert to lower case
-.Return:
-    ret
+    jmp     SHORT Char_ALtoUpperCaseLetter.CheckCF
 %endif
 
@@ -179 +176 @@
 Char_ALtoUpperCaseLetter:
     call    Char_IsLowerCaseLetterInAL  ; Is lower case character?
-    jnc     SHORT .Return               ;  If not, return
-    sub     al, 'a'-'A'                 ; Convert to upper case
+.CheckCF:
+    jnc     SHORT Char_ChangeCaseInAL.Return
+    ; Fall to Char_ChangeCaseInAL
+
+;--------------------------------------------------------------------
+; Char_ChangeCaseInAL
+;   Parameters:
+;       AL:     Character to convert (must be A-Z or a-z)
+;   Returns:
+;       AL:     Character converted
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------
+Char_ChangeCaseInAL:
+    xor     al, 32
 .Return:
     ret
-
 
 ;--------------------------------------------------------------------