From: Luis Pires <luis.pires@eldorado.org.br>
Date: Fri, 10 Sep 2021 11:26:05 +0000 (-0300)
Subject: host-utils: introduce uabs64()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d03bba0bfbe6dcacc9d7be2b664d70fde081cc47;p=qemu.git

host-utils: introduce uabs64()

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.pires@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20210910112624.72748-4-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 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