From f067435026123765bcba8094676c813a69d28a88 Mon Sep 17 00:00:00 2001
From: Paul Robinson <paul_robinson@playstation.sony.com>
Date: Mon, 31 Mar 2014 22:29:15 +0000
Subject: Implement the 'optnone' attribute, which suppresses most
 optimizations on a function.

llvm-svn: 205255
---
 clang/lib/CodeGen/CodeGenModule.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'clang/lib/CodeGen/CodeGenModule.cpp')

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index a6a42f0..89d177f 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -660,6 +660,10 @@ void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
     // Naked implies noinline: we should not be inlining such functions.
     B.addAttribute(llvm::Attribute::Naked);
     B.addAttribute(llvm::Attribute::NoInline);
+  } else if (D->hasAttr<OptimizeNoneAttr>()) {
+    // OptimizeNone implies noinline; we should not be inlining such functions.
+    B.addAttribute(llvm::Attribute::OptimizeNone);
+    B.addAttribute(llvm::Attribute::NoInline);
   } else if (D->hasAttr<NoDuplicateAttr>()) {
     B.addAttribute(llvm::Attribute::NoDuplicate);
   } else if (D->hasAttr<NoInlineAttr>()) {
@@ -679,6 +683,12 @@ void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
   if (D->hasAttr<MinSizeAttr>())
     B.addAttribute(llvm::Attribute::MinSize);
 
+  if (D->hasAttr<OptimizeNoneAttr>()) {
+    // OptimizeNone wins over OptimizeForSize and MinSize.
+    B.removeAttribute(llvm::Attribute::OptimizeForSize);
+    B.removeAttribute(llvm::Attribute::MinSize);
+  }
+
   if (LangOpts.getStackProtector() == LangOptions::SSPOn)
     B.addAttribute(llvm::Attribute::StackProtect);
   else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
-- 
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