lkml.org 
[lkml]   [2011]   [Aug]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 13/15] x86: add cmpxchg_flag() variant
On Tue, 23 Aug 2011, H. Peter Anvin wrote:

> I keep meaning to write up a proposal for the gcc people to output
> arithmetic flag status.

Should be relatively straightforward if you make the processor flag a
builtin variable.

i.e. __processor_flag_zero, __processor_flag__gt etc.

Then the inline cmpxchg functions could simply do a

return __processor_flag_zero;

The code generator then needs to realize from the expression that we are
referring to the zero flag and insert the correct jxx instruction.


\
 
 \ /
  Last update: 2011-08-23 22:06    [W:0.147 / U:0.352 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site