<div dir="ltr">On 1 August 2013 14:41, Bill Wendling <span dir="ltr"><<a href="mailto:isanbard@gmail.com" target="_blank">isanbard@gmail.com</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

Author: void<br>
Date: Thu Aug  1 16:41:02 2013<br>
New Revision: 187617<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=187617&view=rev" target="_blank">http://llvm.org/viewvc/llvm-project?rev=187617&view=rev</a><br>
Log:<br>
Use function attributes to indicate if we don't want to realign the stack.<br>
<br>
Modified:<br>
    cfe/trunk/lib/CodeGen/BackendUtil.cpp<br>
    cfe/trunk/lib/CodeGen/CGCall.cpp<br>
<br>
Modified: cfe/trunk/lib/CodeGen/BackendUtil.cpp<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/BackendUtil.cpp?rev=187617&r1=187616&r2=187617&view=diff" target="_blank">http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/BackendUtil.cpp?rev=187617&r1=187616&r2=187617&view=diff</a><br>


==============================================================================<br>
--- cfe/trunk/lib/CodeGen/BackendUtil.cpp (original)<br>
+++ cfe/trunk/lib/CodeGen/BackendUtil.cpp Thu Aug  1 16:41:02 2013<br>
@@ -451,7 +451,6 @@ TargetMachine *EmitAssemblyHelper::Creat<br>
   Options.UnsafeFPMath = CodeGenOpts.UnsafeFPMath;<br>
   Options.UseSoftFloat = CodeGenOpts.SoftFloat;<br>
   Options.StackAlignmentOverride = CodeGenOpts.StackAlignment;<br>
-  Options.RealignStack = CodeGenOpts.StackRealignment;<br>
   Options.DisableTailCalls = CodeGenOpts.DisableTailCalls;<br>
   Options.TrapFuncName = CodeGenOpts.TrapFuncName;<br>
   Options.PositionIndependentExecutable = LangOpts.PIELevel != 0;<br>
<br>
Modified: cfe/trunk/lib/CodeGen/CGCall.cpp<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGCall.cpp?rev=187617&r1=187616&r2=187617&view=diff" target="_blank">http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGCall.cpp?rev=187617&r1=187616&r2=187617&view=diff</a><br>


==============================================================================<br>
--- cfe/trunk/lib/CodeGen/CGCall.cpp (original)<br>
+++ cfe/trunk/lib/CodeGen/CGCall.cpp Thu Aug  1 16:41:02 2013<br>
@@ -1084,6 +1084,9 @@ void CodeGenModule::ConstructAttributeLi<br>
<br>
     FuncAttrs.addAttribute("no-frame-pointer-elim-non-leaf",<br>
                            llvm::toStringRef(NoFramePointerElimNonLeaf));<br>
+<br>
+    if (!CodeGenOpts.StackRealignment)<br>
+      FuncAttrs.addAttribute("no-realign-stack");<br>
   }<br></blockquote><div><br></div><div>This is not what mstackrealign does. There are three stack realignment modes, on off and forced. -mstackrealign forces a stack alignment to occur on entry to every function. no-realign-stack (off) forbids realigning stack even if you put a stack object on the stack which requires a higher alignment than the stack provides.</div>

<div><br></div><div>Nick</div><div><br></div></div></div></div>