fixed bug #1076940

[fw/sdcc] / src / mcs51 / peeph.def

diff --git a/src/mcs51/peeph.def b/src/mcs51/peeph.def
index 1e44366c20c7f75dd96424cf29843fe492465ee6..eae66f0a00f35203722891c1229e3a2e890d9dfc 100644 (file)
--- a/src/mcs51/peeph.def
+++ b/src/mcs51/peeph.def
@@ -1082,15 +1082,20 @@ replace {
 
 // applies to f.e. bug-408972.c
 // not before peephole 177.c
-replace restart {
-       mov     %1,%2
-       mov     %3,%4
-       mov     %2,%1
-} by {
-       ;       Peephole 177.d  removed redundant move
-       mov     %1,%2
-       mov     %3,%4
-} if notVolatile %1 %2
+// Bug #1076940, this rule erroneously applies to:
+//     mov     a,r2
+//     mov     acc.0,c
+//     mov     r2,a
+//
+//replace restart {
+//     mov     %1,%2
+//     mov     %3,%4
+//     mov     %2,%1
+//} by {
+//     ;       Peephole 177.d  removed redundant move
+//     mov     %1,%2
+//     mov     %3,%4
+//} if notVolatile %1 %2
 
 // applies to f.e. bug-607243.c
 // also check notVolatile %3, as it will return FALSE if it's @r%1