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| author | Petar Avramovic <Petar.Avramovic@amd.com> | 2023-10-04 13:58:47 +0200 |
|---|---|---|
| committer | Petar Avramovic <Petar.Avramovic@amd.com> | 2023-10-06 15:00:08 +0200 |
| commit | 2fa7d652d02ae5da0d32d63c4258705eadab1576 (patch) | |
| tree | e4357c0b510667a4da94b54f05a1f3389af865db /llvm/lib/CodeGen/MachineBasicBlock.cpp | |
| parent | 2d7fe90a3eb8b31bc02ee4407b3e74336ac729fc (diff) | |
| download | llvm-2fa7d652d02ae5da0d32d63c4258705eadab1576.zip llvm-2fa7d652d02ae5da0d32d63c4258705eadab1576.tar.gz llvm-2fa7d652d02ae5da0d32d63c4258705eadab1576.tar.bz2 | |
AMDGPU: Fix temporal divergence introduced by machine-sink (#67456)
Temporal divergence that was present in input or introduced in IR
transforms, like code-sinking or LICM, is handled in SIFixSGPRCopies
by changing sgpr source instr to vgpr instr.
After 5b657f5, that moved LICM after AMDGPUCodeGenPrepare,
machine-sinking can introduce temporal divergence by sinking
instructions outside of the cycle.
Add isSafeToSink callback in TargetInstrInfo.
Diffstat (limited to 'llvm/lib/CodeGen/MachineBasicBlock.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineBasicBlock.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MachineBasicBlock.cpp b/llvm/lib/CodeGen/MachineBasicBlock.cpp index 280ced6..7d3d8b6 100644 --- a/llvm/lib/CodeGen/MachineBasicBlock.cpp +++ b/llvm/lib/CodeGen/MachineBasicBlock.cpp @@ -960,6 +960,10 @@ const MachineBasicBlock *MachineBasicBlock::getSingleSuccessor() const { return Successors.size() == 1 ? Successors[0] : nullptr; } +const MachineBasicBlock *MachineBasicBlock::getSinglePredecessor() const { + return Predecessors.size() == 1 ? Predecessors[0] : nullptr; +} + MachineBasicBlock *MachineBasicBlock::getFallThrough(bool JumpToFallThrough) { MachineFunction::iterator Fallthrough = getIterator(); ++Fallthrough; |