From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 6 Dec 2011 01:57:48 +0000 (+0000)
Subject: Add a comment.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=80caf9c2737d4f1bf5bae3a283fe9d538f5e2970;p=oota-llvm.git

Add a comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145896 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86FrameLowering.cpp b/lib/Target/X86/X86FrameLowering.cpp
index 038ca7f34d0..7f3c13391d3 100644
--- a/lib/Target/X86/X86FrameLowering.cpp
+++ b/lib/Target/X86/X86FrameLowering.cpp
@@ -456,6 +456,9 @@ static uint32_t encodeCompactUnwindRegistersWithFrame(unsigned SavedRegs[6],
     int CURegNum = getCompactUnwindRegNum(CURegs, Reg);
     if (CURegNum == -1)
       return ~0U;
+
+    // Encode the 3-bit register number in order, skipping over 3-bits for each
+    // register.
     RegEnc |= (CURegNum & 0x7) << ((5 - I) * 3);
   }