From 2bec637637df08ffa5a43c0e75fa04015934e0e3 Mon Sep 17 00:00:00 2001
From: Piotr Fusik <fox@scene.pl>
Date: Tue, 5 Nov 2019 20:15:34 +0100
Subject: [PATCH 087/170] Optimize a negation in signed division.
---
libsrc/runtime/idiv32by16r16.s | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/libsrc/runtime/idiv32by16r16.s b/libsrc/runtime/idiv32by16r16.s
index 12e7feb5..098e3dbf 100644
--- a/libsrc/runtime/idiv32by16r16.s
+++ b/libsrc/runtime/idiv32by16r16.s
@@ -29,19 +29,18 @@ idiv32by16r16:
stx ptr3+1
lda ptr2+1
+ cmp #$80
eor tmp1
sta tmp1
- bit ptr2+1
- bpl @L3
+ bcc @L3
; Negate the value in ptr1:ptr2
ldx #0
ldy #4
- sec
-@L2: lda ptr1,x
- eor #$FF
- adc #$00
+; sec
+@L2: lda #$00
+ sbc ptr1,x
sta ptr1,x
inx
dey
--
2.26.0