From: Julian Seward <jseward@acm.org>
Date: Fri, 12 Nov 2004 00:13:21 +0000 (+0000)
Subject: Add a couple more constant folding rules.
X-Git-Tag: svn/VALGRIND_3_0_1^2~787
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e77e2a01f6c1cbdfebce7a55120c5a8e36698ae0;p=thirdparty%2Fvalgrind.git

Add a couple more constant folding rules.


git-svn-id: svn://svn.valgrind.org/vex/trunk@547
---

diff --git a/VEX/priv/ir/iropt.c b/VEX/priv/ir/iropt.c
index 9f692c91ca..b9372e2e2f 100644
--- a/VEX/priv/ir/iropt.c
+++ b/VEX/priv/ir/iropt.c
@@ -342,6 +342,13 @@ static Bool sameIRTemps ( IRExpr* e1, IRExpr* e2 )
           && e1->Iex.Tmp.tmp == e2->Iex.Tmp.tmp;
 }
 
+static Bool notBool ( Bool b )
+{
+   if (b == True) return False;
+   if (b == False) return True;
+   vpanic("notBool");
+}
+
 static IRExpr* fold_Expr ( IRExpr* e )
 {
    Int     shift;
@@ -415,6 +422,11 @@ static IRExpr* fold_Expr ( IRExpr* e )
                     ~ (e->Iex.Unop.arg->Iex.Const.con->Ico.U8)));
             break;
 
+         case Iop_Not1:
+            e2 = IRExpr_Const(IRConst_Bit(
+                    notBool(e->Iex.Unop.arg->Iex.Const.con->Ico.Bit)));
+            break;
+
          default: 
             goto unhandled;
       }
@@ -555,11 +567,17 @@ static IRExpr* fold_Expr ( IRExpr* e )
                        ((Int)(e->Iex.Binop.arg1->Iex.Const.con->Ico.U32)
                         <= (Int)(e->Iex.Binop.arg2->Iex.Const.con->Ico.U32))));
                break;
+
             case Iop_CmpLT32S:
                e2 = IRExpr_Const(IRConst_Bit(
                        ((Int)(e->Iex.Binop.arg1->Iex.Const.con->Ico.U32)
                         < (Int)(e->Iex.Binop.arg2->Iex.Const.con->Ico.U32))));
                break;
+            case Iop_CmpLT32U:
+               e2 = IRExpr_Const(IRConst_Bit(
+                       ((UInt)(e->Iex.Binop.arg1->Iex.Const.con->Ico.U32)
+                        < (UInt)(e->Iex.Binop.arg2->Iex.Const.con->Ico.U32))));
+               break;
 
             case Iop_32HLto64:
                e2 = IRExpr_Const(IRConst_U64(