Add comment.

llvm-svn: 40022
2007-07-18 23:34:48 +00:00 · 2007-07-18 23:34:48 +00:00 · a8d152a22a
parent dcc3451f8a
commit a8d152a22a
1 changed files with 3 additions and 0 deletions
--- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
@ -369,6 +369,9 @@ bool SimpleRegisterCoalescing::JoinCopy(MachineInstr *CopyMI,
  // If the intervals were swapped by Join, swap them back so that the register
  // mapping (in the r2i map) is correct.
  if (Swapped) SrcInt.swap(DstInt);
+
+  // repSrcReg is guarateed to be the register whose live interval that is
+  // being merged.
  li_->removeInterval(repSrcReg);
  r2rMap_[repSrcReg] = repDstReg;