lkml.org 
[lkml]   [2018]   [Apr]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH 08/45] C++: Implement abs() as an inline template function
    From
    Date
    Implement abs() as an C++ inline template function as that greatly
    simplifies the source.

    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    include/linux/kernel.h | 19 +++++--------------
    1 file changed, 5 insertions(+), 14 deletions(-)

    diff --git a/include/linux/kernel.h b/include/linux/kernel.h
    index e779a7487c34..59089f76c7d8 100644
    --- a/include/linux/kernel.h
    +++ b/include/linux/kernel.h
    @@ -246,20 +246,11 @@ extern int _cond_resched(void);
    *
    * Return: an absolute value of x.
    */
    -#define abs(x) __abs_choose_expr(x, long long, \
    - __abs_choose_expr(x, long, \
    - __abs_choose_expr(x, int, \
    - __abs_choose_expr(x, short, \
    - __abs_choose_expr(x, char, \
    - __builtin_choose_expr( \
    - __builtin_types_compatible_p(typeof(x), char), \
    - (char)({ signed char __x = (x); __x<0?-__x:__x; }), \
    - ((void)0)))))))
    -
    -#define __abs_choose_expr(x, type, other) __builtin_choose_expr( \
    - __builtin_types_compatible_p(typeof(x), signed type) || \
    - __builtin_types_compatible_p(typeof(x), unsigned type), \
    - ({ signed type __x = (x); __x < 0 ? -__x : __x; }), other)
    +template<typename T>
    +static inline T abs(T v)
    +{
    + return v < 0 ? -v : v;
    +}

    /**
    * reciprocal_scale - "scale" a value into range [0, ep_ro)
    \
     
     \ /
      Last update: 2018-04-01 23:03    [W:4.113 / U:1.592 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site