From 6175271651d769610d5aa3fbd46b6ad61ee56056 Mon Sep 17 00:00:00 2001
From: IrgendwerA8 <c.krueger.b@web.de>
Date: Tue, 22 May 2018 19:10:07 +0200
Subject: [PATCH] Removed optimizations which break the compiler ones.

---
 libsrc/runtime/mulax3.s | 4 ++--
 libsrc/runtime/mulax5.s | 5 +++--
 libsrc/runtime/mulax7.s | 5 +++--
 libsrc/runtime/mulax9.s | 5 +++--
 4 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/libsrc/runtime/mulax3.s b/libsrc/runtime/mulax3.s
index 82cc033c3..472bc60ec 100644
--- a/libsrc/runtime/mulax3.s
+++ b/libsrc/runtime/mulax3.s
@@ -15,11 +15,11 @@
         rol     ptr1+1
         clc
         adc     ptr1
-        tay
+        pha
         txa
         adc     ptr1+1
         tax
-        tya
+        pla
         rts
 
 .endproc
diff --git a/libsrc/runtime/mulax5.s b/libsrc/runtime/mulax5.s
index bf5eaefe8..99f0ffce0 100644
--- a/libsrc/runtime/mulax5.s
+++ b/libsrc/runtime/mulax5.s
@@ -3,6 +3,7 @@
 ;
 ; CC65 runtime: Multiply the primary register by 5
 ;
+; Don't touch the Y-register here, the optimizer relies on it!
 
         .export         mulax5
         .importzp       ptr1
@@ -17,11 +18,11 @@
         rol     ptr1+1
         clc
         adc     ptr1
-        tay
+        pha
         txa
         adc     ptr1+1
         tax
-        tya
+        pla
         rts
 
 .endproc
diff --git a/libsrc/runtime/mulax7.s b/libsrc/runtime/mulax7.s
index 3414ebc9e..6f2b2bf61 100644
--- a/libsrc/runtime/mulax7.s
+++ b/libsrc/runtime/mulax7.s
@@ -4,6 +4,7 @@
 ;
 ; CC65 runtime: Multiply the primary register by 7
 ;
+; Don't touch the Y-register here, the optimizer relies on it!
 
         .export         mulax7
         .importzp       ptr1
@@ -20,12 +21,12 @@
         rol     ptr1+1                  ; * 8
         sec
         sbc     ptr1
-        tay
+        pha
         txa
         eor     #$ff
         adc     ptr1+1                  ; * (8 - 1)
         tax
-        tya
+        pla
         rts
 
 .endproc
diff --git a/libsrc/runtime/mulax9.s b/libsrc/runtime/mulax9.s
index d175d55aa..064eb458b 100644
--- a/libsrc/runtime/mulax9.s
+++ b/libsrc/runtime/mulax9.s
@@ -4,6 +4,7 @@
 ;
 ; CC65 runtime: Multiply the primary register by 9
 ;
+; Don't touch the Y-register here, the optimizer relies on it!
 
         .export         mulax9
         .importzp       ptr1
@@ -20,11 +21,11 @@
         rol     ptr1+1                  ; * 8
         clc
         adc     ptr1                    ; * (8+1)
-        tay
+        pha
         txa
         adc     ptr1+1
         tax
-        tya
+        pla
         rts
 
 .endproc