From: Jan Hubicka <jh@suse.cz>
Date: Mon, 21 Nov 2005 13:14:02 +0000 (+0100)
Subject: re PR tree-optimization/24653 (EON regressed seriously on x86-64)
X-Git-Tag: releases/gcc-4.2.0~5835
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=078152a256a43a888048dcec5e2c6d503db5b75c;p=thirdparty%2Fgcc.git

re PR tree-optimization/24653 (EON regressed seriously on x86-64)

	PR tree-optimization/24653
	* tree-ssa-ccp.c (ccp_fold): Strip down useless conversions.

From-SVN: r107304
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c9e309ad0dd4..008444d0bd94 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2005-11-21  Jan Hubicka  <jh@suse.cz>
+
+	PR tree-optimization/24653
+	* tree-ssa-ccp.c (ccp_fold): Strip down useless conversions.
+
 2005-11-21  Uros Bizjak  <uros@kss-loka.si>
 
 	* config/i386/predicates.md (ax_reg_operand): New predicate.
diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c
index cd446ee63e0f..a838ce925cd9 100644
--- a/gcc/tree-ssa-ccp.c
+++ b/gcc/tree-ssa-ccp.c
@@ -879,6 +879,10 @@ ccp_fold (tree stmt)
 	    op0 = get_value (op0, true)->value;
 	}
 
+      if ((code == NOP_EXPR || code == CONVERT_EXPR)
+	  && tree_ssa_useless_type_conversion_1 (TREE_TYPE (rhs),
+		  				 TREE_TYPE (op0)))
+	return op0;
       return fold_unary (code, TREE_TYPE (rhs), op0);
     }