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| author | Argyrios Kyrtzidis <akyrtzi@gmail.com> | 2011-04-28 22:57:55 +0000 |
|---|---|---|
| committer | Argyrios Kyrtzidis <akyrtzi@gmail.com> | 2011-04-28 22:57:55 +0000 |
| commit | 657baf19ca8a48a926bd3bc148b6ad1b17e53199 (patch) | |
| tree | 964422c8d1d6ab15f982f7f712845f6cdb56be42 /lib/CodeGen/CGExprCXX.cpp | |
| parent | 07a8a21c3376f3a2ee470bfa3549c6f3ac4e236d (diff) | |
Cut down unnecessary zero'ing when value-initializing arrays of C++ objects.
-C++ objects with user-declared constructor don't need zero'ing.
-We can zero-initialize arrays of C++ objects in "bulk" now, in which case don't zero-initialize each object again.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130453 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/CGExprCXX.cpp')
| -rw-r--r-- | lib/CodeGen/CGExprCXX.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/CodeGen/CGExprCXX.cpp b/lib/CodeGen/CGExprCXX.cpp index 94f9505342..2f3e4680a7 100644 --- a/lib/CodeGen/CGExprCXX.cpp +++ b/lib/CodeGen/CGExprCXX.cpp @@ -370,8 +370,9 @@ CodeGenFunction::EmitCXXConstructExpr(const CXXConstructExpr *E, // If we require zero initialization before (or instead of) calling the // constructor, as can be the case with a non-user-provided default - // constructor, emit the zero initialization now. - if (E->requiresZeroInitialization()) + // constructor, emit the zero initialization now, unless destination is + // already zeroed. + if (E->requiresZeroInitialization() && !Dest.isZeroed()) EmitNullInitialization(Dest.getAddr(), E->getType()); // If this is a call to a trivial default constructor, do nothing. |