From: Luis Pires <luis.pi...@eldorado.org.br>
Introduce uabs64(), a function that returns the absolute value of
a 64-bit int as an unsigned value. This avoids the undefined behavior
for common abs implementations, where abs of the most negative value is
undefined.
Signed-off-by: Luis Pires <luis.pi...@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Reviewed-by: Eduardo Habkost <ehabk...@redhat.com>
Message-Id: <20210910112624.72748-4-luis.pi...@eldorado.org.br>
Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
---
include/qemu/host-utils.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h
index 753b9fb89f..ca9f3f021b 100644
--- a/include/qemu/host-utils.h
+++ b/include/qemu/host-utils.h
@@ -357,6 +357,14 @@ static inline uint64_t revbit64(uint64_t x)
#endif
}
+/**
+ * Return the absolute value of a 64-bit integer as an unsigned 64-bit value
+ */
+static inline uint64_t uabs64(int64_t v)
+{
+ return v < 0 ? -v : v;
+}
+
/**
* sadd32_overflow - addition with overflow indication
* @x, @y: addends
--
2.31.1
