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diff src/share/vm/adlc/formssel.cpp @ 17729:8a8ff6b577ed

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8031321: Support Intel bit manipulation instructions Summary: Add support for BMI1 instructions Reviewed-by: kvn, roland
author iveresov
date Wed, 12 Mar 2014 11:24:26 -0700
parents 55fb97c4c58d
children 62c54fcc0a35
line wrap: on
line diff
--- a/src/share/vm/adlc/formssel.cpp	Mon Jan 27 13:14:53 2014 +0100
+++ b/src/share/vm/adlc/formssel.cpp	Wed Mar 12 11:24:26 2014 -0700
@@ -649,6 +649,7 @@
   int USE_of_memory  = 0;
   int DEF_of_memory  = 0;
   const char*    last_memory_DEF = NULL; // to test DEF/USE pairing in asserts
+  const char*    last_memory_USE = NULL;
   Component     *unique          = NULL;
   Component     *comp            = NULL;
   ComponentList &components      = (ComponentList &)_components;
@@ -670,7 +671,16 @@
           assert(0 == strcmp(last_memory_DEF, comp->_name), "every memory DEF is followed by a USE of the same name");
           last_memory_DEF = NULL;
         }
-        USE_of_memory++;
+        // Handles same memory being used multiple times in the case of BMI1 instructions.
+        if (last_memory_USE != NULL) {
+          if (strcmp(comp->_name, last_memory_USE) != 0) {
+            USE_of_memory++;
+          }
+        } else {
+          USE_of_memory++;
+        }
+        last_memory_USE = comp->_name;
+
         if (DEF_of_memory == 0)  // defs take precedence
           unique = comp;
       } else {