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-rw-r--r--llvm/lib/CodeGen/VirtRegMap.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/VirtRegMap.cpp b/llvm/lib/CodeGen/VirtRegMap.cpp
index ddbb72bf9d8..fcba8add32c 100644
--- a/llvm/lib/CodeGen/VirtRegMap.cpp
+++ b/llvm/lib/CodeGen/VirtRegMap.cpp
@@ -338,6 +338,7 @@ bool VirtRegRewriter::readsUndefSubreg(const MachineOperand &MO) const {
assert(LI.liveAt(BaseIndex) &&
"Reads of completely dead register should be marked undef already");
unsigned SubRegIdx = MO.getSubReg();
+ assert(SubRegIdx != 0 && LI.hasSubRanges());
LaneBitmask UseMask = TRI->getSubRegIndexLaneMask(SubRegIdx);
// See if any of the relevant subregister liveranges is defined at this point.
for (const LiveInterval::SubRange &SR : LI.subranges()) {
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