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-rw-r--r--runtime/c/i64.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/runtime/c/i64.h b/runtime/c/i64.h
index dd584533..a75214fe 100644
--- a/runtime/c/i64.h
+++ b/runtime/c/i64.h
@@ -41,3 +41,5 @@ extern signed long long __i64_sar(signed long long x, int amount);
extern unsigned long long __i64_udivmod(unsigned long long n,
unsigned long long d,
unsigned long long * rp);
+extern unsigned long long __i64_umulh(unsigned long long u,
+ unsigned long long v);