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diff src/share/vm/opto/matcher.hpp @ 1914:ae065c367d93

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6987135: Performance regression on Intel platform with 32-bits edition between 6u13 and 6u14. Summary: Use hardware DIV instruction for long division by constant when it is faster than code with multiply. Reviewed-by: never
author kvn
date Tue, 02 Nov 2010 09:00:37 -0700
parents e9ff18c4ace7
children f95d63e2154a
line wrap: on
line diff
--- a/src/share/vm/opto/matcher.hpp	Sat Oct 30 13:08:23 2010 -0700
+++ b/src/share/vm/opto/matcher.hpp	Tue Nov 02 09:00:37 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -298,6 +298,10 @@
   // Register for MODL projection of divmodL
   static RegMask modL_proj_mask();
 
+  // Use hardware DIV instruction when it is faster than
+  // a code which use multiply for division by constant.
+  static bool use_asm_for_ldiv_by_con( jlong divisor );
+
   static const RegMask method_handle_invoke_SP_save_mask();
 
   // Java-Interpreter calling convention