From: Julian Seward <jseward@acm.org>
Date: Sat, 6 Nov 2004 12:10:04 +0000 (+0000)
Subject: And-identity folding rule.
X-Git-Tag: svn/VALGRIND_3_0_1^2~832
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a669c9c9e296778b25f6387baae41e3d7c14cc01;p=thirdparty%2Fvalgrind.git

And-identity folding rule.


git-svn-id: svn://svn.valgrind.org/vex/trunk@502
---

diff --git a/VEX/priv/ir/iropt.c b/VEX/priv/ir/iropt.c
index 1e91a51d4b..01577e34ef 100644
--- a/VEX/priv/ir/iropt.c
+++ b/VEX/priv/ir/iropt.c
@@ -560,6 +560,13 @@ static IRExpr* fold_Expr ( IRExpr* e )
             e2 = e->Iex.Binop.arg1;
          } else
 
+         /* And32(x,0xFFFFFFFF) ==> x */
+         if (e->Iex.Binop.op == Iop_And32
+             && e->Iex.Binop.arg2->tag == Iex_Const
+             && e->Iex.Binop.arg2->Iex.Const.con->Ico.U32 == 0xFFFFFFFF) {
+            e2 = e->Iex.Binop.arg1;
+         } else
+
          /* Or32(0,x) ==> x */
          if (e->Iex.Binop.op == Iop_Or32
              && e->Iex.Binop.arg1->tag == Iex_Const