From: Jacob Lifshay <programmerjake@gmail.com>
Date: Tue, 26 Apr 2022 06:16:55 +0000 (-0700)
Subject: fix UB caused by lkcl in 1afca349cc91beebe7fd04260e0f9e9dbf85eb06
X-Git-Tag: opf_rfc_ls005_v1~2587
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=60166adec55dc15fed77ccfcd5dad5fda22df6af;p=libreriscv.git

fix UB caused by lkcl in 1afca349cc91beebe7fd04260e0f9e9dbf85eb06
---

diff --git a/openpower/sv/biginteger/divmnu64.c b/openpower/sv/biginteger/divmnu64.c
index 8783f8d1a..0d3f3973a 100644
--- a/openpower/sv/biginteger/divmnu64.c
+++ b/openpower/sv/biginteger/divmnu64.c
@@ -98,7 +98,7 @@ int divmnu(unsigned q[], unsigned r[], const unsigned u[], const unsigned v[],
         k = 0; // the case of a
         for (j = m - 1; j >= 0; j--)
         { // single-digit
-            uint64_t dig2 = (k << 32) | u[j];
+            uint64_t dig2 = ((uint64_t)k << 32) | u[j];
             q[j] = dig2 / v[0]; // divisor here.
             k = dig2 % v[0];    // modulo back into next loop
         }