commit 4e87e850a2055180a8497a4806559fa14a89778e
author Bill Wendling <isanbard@gmail.com> Tue Dec 06 01:57:48 2011 +0000
committer Bill Wendling <isanbard@gmail.com> Tue Dec 06 01:57:48 2011 +0000
tree e84f4b4aea0b4efa21f79b6eecec13e236ded7d6
parent 425e180ce823641a19bc6ea043af387782066f6e

Add a comment.

llvm-svn: 145896

llvm/lib/Target/X86/X86FrameLowering.cpp

diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp
index 038ca7f..7f3c133 100644
--- a/llvm/lib/Target/X86/X86FrameLowering.cpp
+++ b/llvm/lib/Target/X86/X86FrameLowering.cpp
@@ -456,6 +456,9 @@
     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);
   }