From 77007cfdb5f239309e1cc0515ab84950f1ab568d Mon Sep 17 00:00:00 2001
From: Peter Ferrie <peter.ferrie@gmail.com>
Date: Sun, 2 Jun 2019 23:52:47 -0400
Subject: [PATCH] pt3: make negating code more efficient

vmw: fix a L/H typo that was causing validation test fail
---
 pt3_player/pt3_lib.s | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/pt3_player/pt3_lib.s b/pt3_player/pt3_lib.s
index 420560ef..7d7a23c1 100644
--- a/pt3_player/pt3_lib.s
+++ b/pt3_player/pt3_lib.s
@@ -1529,17 +1529,15 @@ weird_version:
 
 	; a->tone_slide_step = -a->tone_slide_step;
 
-	lda	note_a+NOTE_TONE_SLIDE_STEP_H,X
-	eor	#$ff
-	sta	note_a+NOTE_TONE_SLIDE_STEP_H,X
 	lda	note_a+NOTE_TONE_SLIDE_STEP_L,X
 	eor	#$ff
 	clc
 	adc	#$1
 	sta	note_a+NOTE_TONE_SLIDE_STEP_L,X
-	bcc	skip_step_inc2
-	inc	note_a+NOTE_TONE_SLIDE_STEP_H,X
-skip_step_inc2:
+	lda	note_a+NOTE_TONE_SLIDE_STEP_H,X
+	eor	#$ff
+	adc	#$0
+	sta	note_a+NOTE_TONE_SLIDE_STEP_H,X
 
 no_need: