From a0ca9d1045f4657e9e39bcfe70db188a16573828 Mon Sep 17 00:00:00 2001
From: Matthew Waltz <matthewwaltzis@gmail.com>
Date: Thu, 24 Oct 2024 20:06:28 -0600
Subject: [PATCH] [libc] optimize _isdigit

---
 src/libc/isdigit.src | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/src/libc/isdigit.src b/src/libc/isdigit.src
index 9d37b03aa..f42d724e9 100644
--- a/src/libc/isdigit.src
+++ b/src/libc/isdigit.src
@@ -3,21 +3,12 @@
 	section	.text
 	public	_isdigit
 _isdigit:
-	pop	hl
 	pop	de
+	ex	(sp),hl
 	push	de
-	push	hl
-	or	a,a
+	ld	a,l
+	sub	a,48
+	add	a,-10
 	sbc	hl,hl
-	bit	7,e
-	ret	nz
-	ex	de,hl
-	ld	de,___maptab
-	add	hl,de
-	ld	a,(hl)
-	and	a,1
-	sbc	hl,hl
-	ld	l,a
+	inc	hl
 	ret
-
-	extern	___maptab