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| author | Stanislav Mekhanoshin <Stanislav.Mekhanoshin@amd.com> | 2021-07-12 12:27:34 -0700 |
|---|---|---|
| committer | Stanislav Mekhanoshin <Stanislav.Mekhanoshin@amd.com> | 2021-07-14 13:03:58 -0700 |
| commit | 76b7d3432e38bb7690c3bbd4940786b5cb751b95 (patch) | |
| tree | 7e1d3e09a666b6fa2b7297c9aa5573ffdd5114ab /llvm/lib/CodeGen/LiveRangeEdit.cpp | |
| parent | ba2690b17b9e463b80a1d6c675e3d04fc2974083 (diff) | |
| download | llvm-76b7d3432e38bb7690c3bbd4940786b5cb751b95.zip llvm-76b7d3432e38bb7690c3bbd4940786b5cb751b95.tar.gz llvm-76b7d3432e38bb7690c3bbd4940786b5cb751b95.tar.bz2 | |
[AMDGPU] Add TII::isIgnorableUse() to allow VOP rematerialization
Any def of EXEC prevents rematerialization of any VOP instruction
because of the physreg use. Create a callback to check if the
physreg use can be ingored to allow rematerialization.
Differential Revision: https://reviews.llvm.org/D105836
Diffstat (limited to 'llvm/lib/CodeGen/LiveRangeEdit.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/LiveRangeEdit.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/LiveRangeEdit.cpp b/llvm/lib/CodeGen/LiveRangeEdit.cpp index c5d1734..64a2dd2 100644 --- a/llvm/lib/CodeGen/LiveRangeEdit.cpp +++ b/llvm/lib/CodeGen/LiveRangeEdit.cpp @@ -113,9 +113,10 @@ bool LiveRangeEdit::allUsesAvailableAt(const MachineInstr *OrigMI, if (!MO.isReg() || !MO.getReg() || !MO.readsReg()) continue; - // We can't remat physreg uses, unless it is a constant. + // We can't remat physreg uses, unless it is a constant or target wants + // to ignore this use. if (Register::isPhysicalRegister(MO.getReg())) { - if (MRI.isConstantPhysReg(MO.getReg())) + if (MRI.isConstantPhysReg(MO.getReg()) || TII.isIgnorableUse(MO)) continue; return false; } |