From 2f3fde60c316031f657e149c56ff3eaa8ae2c7fa Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Fri, 9 Aug 2013 13:47:00 -0700
Subject: Implement an `address_insignificant` attribute

This can be applied to statics and it will indicate that LLVM will attempt to
merge the constant in .data with other statics.

I have preliminarily applied this to all of the statics generated by the new
`ifmt!` syntax extension. I compiled a file with 1000 calls to `ifmt!` and a
separate file with 1000 calls to `fmt!` to compare the sizes, and the results
were:

fmt           310k
ifmt (before) 529k
ifmt (after)  202k

This now means that ifmt! is both faster and smaller than fmt!, yay!
---
 src/rustllvm/RustWrapper.cpp | 4 ++++
 src/rustllvm/rustllvm.def.in | 1 +
 2 files changed, 5 insertions(+)

(limited to 'src/rustllvm')

diff --git a/src/rustllvm/RustWrapper.cpp b/src/rustllvm/RustWrapper.cpp
index 04c062072d6..db353036336 100644
--- a/src/rustllvm/RustWrapper.cpp
+++ b/src/rustllvm/RustWrapper.cpp
@@ -833,3 +833,7 @@ extern "C" LLVMValueRef LLVMDIBuilderCreateUnionType(
         unwrapDI<DIArray>(Elements),
         RunTimeLang));
 }
+
+extern "C" void LLVMSetUnnamedAddr(LLVMValueRef Value, LLVMBool Unnamed) {
+    unwrap<GlobalValue>(Value)->setUnnamedAddr(Unnamed);
+}
diff --git a/src/rustllvm/rustllvm.def.in b/src/rustllvm/rustllvm.def.in
index 260a16dab98..a2af7a18b4f 100644
--- a/src/rustllvm/rustllvm.def.in
+++ b/src/rustllvm/rustllvm.def.in
@@ -613,3 +613,4 @@ LLVMDIBuilderInsertDeclareBefore
 LLVMDIBuilderCreateEnumerator
 LLVMDIBuilderCreateEnumerationType
 LLVMDIBuilderCreateUnionType
+LLVMSetUnnamedAddr
-- 
cgit 1.4.1-3-g733a5