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-rw-r--r--lib/CodeGen/MachineInstr.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 5d16c20460..85b5e39864 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -660,7 +660,9 @@ void MachineInstr::addOperand(const MachineOperand &Op) {
// OpNo now points as the desired insertion point. Unless this is a variadic
// instruction, only implicit regs are allowed beyond MCID->getNumOperands().
- assert((isImpReg || MCID->isVariadic() || OpNo < MCID->getNumOperands()) &&
+ // RegMask operands go between the explicit and implicit operands.
+ assert((isImpReg || Op.isRegMask() || MCID->isVariadic() ||
+ OpNo < MCID->getNumOperands()) &&
"Trying to add an operand to a machine instr that is already done!");
// All operands from OpNo have been removed from RegInfo. If the Operands