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-rw-r--r--js/src/jit/MIR.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/js/src/jit/MIR.h b/js/src/jit/MIR.h
index 6ec05af76..b2e84322f 100644
--- a/js/src/jit/MIR.h
+++ b/js/src/jit/MIR.h
@@ -8272,7 +8272,10 @@ class MGetFirstDollarIndex
: MUnaryInstruction(str)
{
setResultType(MIRType::Int32);
- setMovable();
+
+ // Codegen assumes string length > 0 but that's not guaranteed in RegExp.
+ // Don't allow LICM to move this.
+ MOZ_ASSERT(!isMovable());
}
public: