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merge of 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

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llvm-svn: 49787
This commit is contained in:
Gabor Greif 2008-04-16 11:43:47 +00:00
parent 6d05ce493b
commit 32b4942a0a
1 changed files with 2 additions and 2 deletions
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4
include/llvm/Support/Casting.h
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@ -221,7 +221,7 @@ inline typename cast_retty<X, Y*>::ret_type cast_or_null(Y *Val) {
// //
template <class X, class Y> 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; 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. // value is accepted.
// //
template <class X, class Y> 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; return (Val && isa<X>(Val)) ? cast<X, Y>(Val) : 0;
} }