Next round of earlyclobber handling. Approach the

RA problem by expanding the live interval of an
earlyclobber def back one slot.  Remove
overlap-earlyclobber throughout.  Remove 
earlyclobber bits and their handling from
live internals.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56539 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 12 deletions

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index 05e0505f0b..bdc37b16b6 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -1206,14 +1206,6 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
   DOUT << " and "; DstInt.print(DOUT, tri_);
   DOUT << ": ";
 
-  // If one interval is earlyclobber and the other is overlaps-earlyclobber,
-  // we cannot coalesce them.
-  if ((SrcInt.isEarlyClobber && DstInt.overlapsEarlyClobber) ||
-      (DstInt.isEarlyClobber && SrcInt.overlapsEarlyClobber)) {
-    DOUT << "\t\tCannot join due to earlyclobber.";
-    return false;
-  }
-
   // Check if it is necessary to propagate "isDead" property.
   if (!isExtSubReg && !isInsSubReg) {
     MachineOperand *mopd = CopyMI->findRegisterDefOperand(DstReg, false);
@@ -1374,10 +1366,6 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
   if (TargetRegisterInfo::isVirtualRegister(DstReg))
     RemoveUnnecessaryKills(DstReg, *ResDstInt);
 
-  // Merge the earlyclobber bits.
-  ResDstInt->isEarlyClobber |= ResSrcInt->isEarlyClobber;
-  ResDstInt->overlapsEarlyClobber |= ResSrcInt->overlapsEarlyClobber;
-
   if (isInsSubReg)
     // Avoid:
     // r1024 = op