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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
This commit is contained in:
Eli Friedman 2011-05-27 22:13:20 +00:00
parent d23bfb8a7a
commit 6ffb623a52
2 changed files with 3 additions and 2 deletions
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1
clang/lib/CodeGen/CodeGenModule.cpp
View File

@ -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;
}

4
clang/test/CodeGen/string-literal.c
View File

@ -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";
}