diff options
Diffstat (limited to 'llvm/lib/CodeGen/TailDuplication.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/TailDuplication.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/TailDuplication.cpp b/llvm/lib/CodeGen/TailDuplication.cpp index c2c7a1a3d92..da593ce3717 100644 --- a/llvm/lib/CodeGen/TailDuplication.cpp +++ b/llvm/lib/CodeGen/TailDuplication.cpp @@ -590,6 +590,11 @@ TailDuplicatePass::shouldTailDuplicate(const MachineFunction &MF, if (MI.isNotDuplicable()) return false; + // Convergent instructions can be duplicated only if doing so doesn't add + // new control dependencies, which is what we're going to do here. + if (MI.isConvergent()) + return false; + // Do not duplicate 'return' instructions if this is a pre-regalloc run. // A return may expand into a lot more instructions (e.g. reload of callee // saved registers) after PEI. |
