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-rw-r--r--backend/Machtyping.v1
1 files changed, 1 insertions, 0 deletions
diff --git a/backend/Machtyping.v b/backend/Machtyping.v
index fe086cb4..8b40001a 100644
--- a/backend/Machtyping.v
+++ b/backend/Machtyping.v
@@ -82,6 +82,7 @@ Inductive wt_instr : instruction -> Prop :=
| wt_Mjumptable:
forall arg tbl,
mreg_type arg = Tint ->
+ list_length_z tbl * 4 <= Int.max_signed ->
wt_instr (Mjumptable arg tbl)
| wt_Mreturn:
wt_instr Mreturn.