host-utils: fix missing zero-extension in divs128
*plow (lower 64 bits of the dividend) is passed into divs128() as
a signed 64-bit integer. When building an __int128_t from it, it
must be zero-extended, instead of sign-extended.
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Message-Id: <20210910112624.72748-3-luis.pires@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h
index 711b221..753b9fb 100644
--- a/include/qemu/host-utils.h
+++ b/include/qemu/host-utils.h
@@ -70,7 +70,7 @@
if (divisor == 0) {
return 1;
} else {
- __int128_t dividend = ((__int128_t)*phigh << 64) | *plow;
+ __int128_t dividend = ((__int128_t)*phigh << 64) | (uint64_t)*plow;
__int128_t result = dividend / divisor;
*plow = result;
*phigh = dividend % divisor;