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-rw-r--r--llvm/lib/CodeGen/PeepholeOptimizer.cpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/PeepholeOptimizer.cpp b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
index aec4aaa..48c25d5 100644
--- a/llvm/lib/CodeGen/PeepholeOptimizer.cpp
+++ b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
@@ -426,8 +426,8 @@ public:
const MachineOperand &MODef = CopyLike.getOperand(0);
Dst.Reg = MODef.getReg();
- // If we have to compose sub-registers, bail.
- return MODef.getSubReg() == 0;
+ assert(MODef.getSubReg() == 0 && "cannot have subregister def in SSA");
+ return true;
}
bool RewriteCurrentSource(Register NewReg, unsigned NewSubReg) override {