diff options
| author | Dale Johannesen <dalej@apple.com> | 2008-09-24 01:07:17 +0000 |
|---|---|---|
| committer | Dale Johannesen <dalej@apple.com> | 2008-09-24 01:07:17 +0000 |
| commit | c36660d756c3dafa9534e02c58b76f7bad7c3562 (patch) | |
| tree | 62c8a68dd7f3ba0b1cadb03f36c1a694c1122d75 /llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp | |
| parent | e2aef07b2ddd0eeea19d304ad4993b75882c2b40 (diff) | |
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.
llvm-svn: 56539
Diffstat (limited to 'llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp index 05e0505f0ba5..bdc37b16b6a0 100644 --- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp +++ b/llvm/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 |