* src/z80/gen.h,

[fw/sdcc] / src / SDCCopt.c

diff --git a/src/SDCCopt.c b/src/SDCCopt.c
index 34e0e78a7a92ac95c82346bbe6ba9cf69b2ab409..345f8484bbe3afd793d5d4a7c325a0f6ceb128e6 100644 (file)
--- a/src/SDCCopt.c
+++ b/src/SDCCopt.c
@@ -679,7 +679,8 @@ killDeadCode (eBBlock ** ebbs, int count)
 
              if (SKIP_IC (ic) ||
                  ic->op == IFX ||
-                 ic->op == RETURN)
+                 ic->op == RETURN ||
+                  ic->op == DUMMY_READ_VOLATILE)
                continue;
 
              /* if the result is volatile then continue */
@@ -689,6 +690,9 @@ killDeadCode (eBBlock ** ebbs, int count)
              /* if the result is a temp & isaddr then skip */
              if (IC_RESULT (ic) && POINTER_SET (ic))
                continue;
+              
+              if (POINTER_GET (ic) && IS_VOLATILE (operandType (IC_LEFT (ic))->next))
+                continue;
 
              /* if the result is used in the remainder of the */
              /* block then skip */
@@ -725,7 +729,7 @@ killDeadCode (eBBlock ** ebbs, int count)
                    continue;
 
                  kill = 1;
-               }
+                }
 
            kill:
              /* kill this one if required */