Optimize isdigit, isgraph, islower, isupper

Verified to work
CE-Programming · Jan 15, 2025 · 26ea392 · 26ea392
1 parent bcdb456
commit 26ea392
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Showing 4 changed files with 4 additions and 8 deletions.
diff --git a/src/libc/isdigit.src b/src/libc/isdigit.src
@@ -8,7 +8,6 @@ _isdigit:
 	push	de
 	ld	a,l
 	sub	a,48
-	add	a,-10
+	sub	a,10
 	sbc	hl,hl
-	inc	hl
 	ret
diff --git a/src/libc/isgraph.src b/src/libc/isgraph.src
@@ -8,7 +8,6 @@ _isgraph:
 	push	de
 	ld	a,l
 	sub	a,33
-	add	a,-94
+	sub	a,94
 	sbc	hl,hl
-	inc	hl
 	ret
diff --git a/src/libc/islower.src b/src/libc/islower.src
@@ -8,7 +8,6 @@ _islower:
 	push	de
 	ld	a,l
 	sub	a,97
-	add	a,-26
+	sub	a,26
 	sbc	hl,hl
-	inc	hl
 	ret
diff --git a/src/libc/isupper.src b/src/libc/isupper.src
@@ -8,7 +8,6 @@ _isupper:
 	push	de
 	ld	a,l
 	sub	a,65
-	add	a,-26
+	sub	a,26
 	sbc	hl,hl
-	inc	hl
 	ret