From 9e83467baa7f6c2111de133852ac65f8c2237359 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Mon, 11 Jan 2010 17:14:46 +0000
Subject: [PATCH] Reword this comment to reference a more fundamental issue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93154 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86FastISel.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index 10fba2461ed..7e02d59c1bc 100644
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -1230,8 +1230,8 @@ bool X86FastISel::X86SelectCall(Instruction *I) {
       CC != CallingConv::X86_FastCall)
     return false;
 
-  // On X86, -tailcallopt changes the fastcc ABI. FastISel doesn't
-  // handle this for now.
+  // fastcc with -tailcallopt is intended to provide a guaranteed
+  // tail call optimization. Fastisel doesn't know how to do that.
   if (CC == CallingConv::Fast && PerformTailCallOpt)
     return false;