fixed bug #451453

[fw/sdcc] / src / mcs51 / gen.c

diff --git a/src/mcs51/gen.c b/src/mcs51/gen.c
index ccaacd0812d2af1e27efbad4decffc4799656cab..408e9116539f02c000119a7ad33737b2b91057b4 100644 (file)
--- a/src/mcs51/gen.c
+++ b/src/mcs51/gen.c
@@ -3251,12 +3251,17 @@ genMinus (iCode * ic)
       else
        {
          /* first add without previous c */
-         if (!offset)
-           emitcode ("add", "a,#0x%02x",
-                     (unsigned int) (lit & 0x0FFL));
-         else
+         if (!offset) {
+           if (!size && lit==-1) {
+             emitcode ("dec", "a");
+           } else {
+             emitcode ("add", "a,#0x%02x", 
+                       (unsigned int) (lit & 0x0FFL));
+           }
+         } else {
            emitcode ("addc", "a,#0x%02x",
                      (unsigned int) ((lit >> (offset * 8)) & 0x0FFL));
+         }
        }
       aopPut (AOP (IC_RESULT (ic)), "a", offset++);
     }