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 .
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@132223 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 987ebff..de11a29 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -1899,6 +1899,7 @@
new llvm::GlobalVariable(CGM.getModule(), C->getType(), constant,
llvm::GlobalValue::PrivateLinkage,
C, GlobalName);
+ GV->setAlignment(1);
GV->setUnnamedAddr(true);
return GV;
}
diff --git a/test/CodeGen/string-literal.c b/test/CodeGen/string-literal.c
index 6d02b0f..b5fa345 100644
--- a/test/CodeGen/string-literal.c
+++ b/test/CodeGen/string-literal.c
@@ -8,9 +8,9 @@
// 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";
}