From: Gabor Greif <ggreif@gmail.com>
Date: Wed, 16 Apr 2008 11:43:47 +0000 (+0000)
Subject: merge of r49785 (from branches/ggreif/use-diet): pass V to dyn_cast by const referenc... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=917365bef1cfb8493558b76f8e6ceb1e76eba2c5;p=oota-llvm.git

Merge ... r49785 (from branches/ggreif/use-diet): pass V to dyn_cast by const reference, this avoids copy-constructing and destructing all the time. especially important if these constructors are not accessible

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49787 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Support/Casting.h b/include/llvm/Support/Casting.h
index 3a68817ce99..61b91343cb9 100644
--- a/include/llvm/Support/Casting.h
+++ b/include/llvm/Support/Casting.h
@@ -221,7 +221,7 @@ inline typename cast_retty<X, Y*>::ret_type cast_or_null(Y *Val) {
 //
 
 template <class X, class Y>
-inline typename cast_retty<X, Y>::ret_type dyn_cast(Y Val) {
+inline typename cast_retty<X, Y>::ret_type dyn_cast(const Y &Val) {
   return isa<X>(Val) ? cast<X, Y>(Val) : 0;
 }
 
@@ -229,7 +229,7 @@ inline typename cast_retty<X, Y>::ret_type dyn_cast(Y Val) {
 // value is accepted.
 //
 template <class X, class Y>
-inline typename cast_retty<X, Y>::ret_type dyn_cast_or_null(Y Val) {
+inline typename cast_retty<X, Y>::ret_type dyn_cast_or_null(const Y &Val) {
   return (Val && isa<X>(Val)) ? cast<X, Y>(Val) : 0;
 }