diff options
| author | Luis Pires | 2021-09-10 13:26:05 +0200 |
|---|---|---|
| committer | David Gibson | 2021-09-29 11:37:38 +0200 |
| commit | d03bba0bfbe6dcacc9d7be2b664d70fde081cc47 (patch) | |
| tree | 341ef53a137c982ea064ed969b7287569190a7d8 /include/qemu/host-utils.h | |
| parent | host-utils: fix missing zero-extension in divs128 (diff) | |
| download | qemu-d03bba0bfbe6dcacc9d7be2b664d70fde081cc47.tar.gz qemu-d03bba0bfbe6dcacc9d7be2b664d70fde081cc47.tar.xz qemu-d03bba0bfbe6dcacc9d7be2b664d70fde081cc47.zip | |
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>
Diffstat (limited to 'include/qemu/host-utils.h')
| -rw-r--r-- | include/qemu/host-utils.h | 8 |
1 files changed, 8 insertions, 0 deletions
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 @@ -358,6 +358,14 @@ static inline uint64_t revbit64(uint64_t x) } /** + * 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 * @ret: Output for sum |