diff options
| author | Bill Wendling <isanbard@gmail.com> | 2008-05-29 01:02:09 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2008-05-29 01:02:09 +0000 |
| commit | bd0879d7d9790e4bfa4bdcefd3abda0301e37bae (patch) | |
| tree | e90f49e1f2c6334bdf77c69fc25f26ccd63aba3e /lib/CodeGen/TwoAddressInstructionPass.cpp | |
| parent | 3e93e630aa97893cb758b9300aa18552d07b9539 (diff) | |
Implement "AsCheapAsAMove" for some obviously cheap instructions: xor and the
like.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51662 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/TwoAddressInstructionPass.cpp')
| -rw-r--r-- | lib/CodeGen/TwoAddressInstructionPass.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/TwoAddressInstructionPass.cpp b/lib/CodeGen/TwoAddressInstructionPass.cpp index 5f0a923f99..81864b7c0e 100644 --- a/lib/CodeGen/TwoAddressInstructionPass.cpp +++ b/lib/CodeGen/TwoAddressInstructionPass.cpp @@ -330,10 +330,13 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) { InstructionRearranged: const TargetRegisterClass* rc = MF.getRegInfo().getRegClass(regA); MachineInstr *Orig = MRI->getVRegDef(regB); + const TargetInstrDesc &OrigTID = Orig->getDesc(); bool SawStore = false; if (EnableReMat && Orig && Orig->isSafeToMove(TII, SawStore) && - TII->isTriviallyReMaterializable(Orig)) { + OrigTID.isAsCheapAsAMove() && !OrigTID.mayLoad() && + !OrigTID.isSimpleLoad()) { + DEBUG(cerr << "2addr: REMATTING : " << *Orig << "\n"); TII->reMaterialize(*mbbi, mi, regA, Orig); ReMattedInstrs.insert(Orig); } else { |