Match llvm-gcc's string literals alignment by forcing alignment on string literals to 1. This can significantly impact the size of the string data, and as far as I know, the alignment doesn't help performance. rdar://9078969 .

llvm-svn: 132223

2 files changed, 3 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 987ebffd97d..de11a29f67b 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1899,6 +1899,7 @@ static llvm::Constant *GenerateStringLiteral(llvm::StringRef str,
     new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant,
                              llvm::GlobalValue::PrivateLinkage,
                              C, GlobalName);
+  GV->setAlignment(1);
   GV->setUnnamedAddr(true);
   return GV;
 }
diff --git a/clang/test/CodeGen/string-literal.c b/clang/test/CodeGen/string-literal.c
index 6d02b0fdaf9..b5fa345bada 100644
--- a/clang/test/CodeGen/string-literal.c
+++ b/clang/test/CodeGen/string-literal.c
@@ -8,9 +8,9 @@ int main() {
   // CHECK: internal constant [10 x i8] c"\E1\84\A0\C8\A0\F4\82\80\B0\00", align 1
   char b[10] = "\u1120\u0220\U00102030";
 
-  // CHECK: private unnamed_addr constant [12 x i8] c"A\00\00\00B\00\00\00\00\00\00\00"
+  // CHECK: private unnamed_addr constant [12 x i8] c"A\00\00\00B\00\00\00\00\00\00\00", align 1
   void *foo = L"AB";
 
-  // CHECK: private unnamed_addr constant [12 x i8] c"4\12\00\00\0B\F0\10\00\00\00\00\00"
+  // CHECK: private unnamed_addr constant [12 x i8] c"4\12\00\00\0B\F0\10\00\00\00\00\00", align 1
   void *bar = L"\u1234\U0010F00B";
 }