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| author | Manman Ren <mren@apple.com> | 2012-11-27 18:58:41 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2012-11-27 18:58:41 +0000 |
| commit | 39834da697e5a6d0198a6a802133ce351c871904 (patch) | |
| tree | 7d65925640c6c2c94aa2d63f05f9ddf07e77c305 /lib/CodeGen/MachineCSE.cpp | |
| parent | a241b58f8d5d71eebfb2cb9be3689fe72b454474 (diff) | |
| download | llvm-39834da697e5a6d0198a6a802133ce351c871904.tar.gz llvm-39834da697e5a6d0198a6a802133ce351c871904.tar.bz2 llvm-39834da697e5a6d0198a6a802133ce351c871904.tar.xz | |
CSE: allow PerformTrivialCoalescing to check copies across basic block
boundaries.
Given the following case:
BB0
%vreg1<def> = SUBrr %vreg0, %vreg7
%vreg2<def> = COPY %vreg7
BB1
%vreg10<def> = SUBrr %vreg0, %vreg2
We should be able to CSE between SUBrr in BB0 and SUBrr in BB1.
rdar://12462006
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168717 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineCSE.cpp')
| -rw-r--r-- | lib/CodeGen/MachineCSE.cpp | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp index dbc41defeb..56cea4e599 100644 --- a/lib/CodeGen/MachineCSE.cpp +++ b/lib/CodeGen/MachineCSE.cpp @@ -126,8 +126,6 @@ bool MachineCSE::PerformTrivialCoalescing(MachineInstr *MI, // deleted. continue; MachineInstr *DefMI = MRI->getVRegDef(Reg); - if (DefMI->getParent() != MBB) - continue; if (!DefMI->isCopy()) continue; unsigned SrcReg = DefMI->getOperand(1).getReg(); |