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Subject: [Boost-commit] svn:boost r78189 - trunk/libs/context/doc
From: oliver.kowalke_at_[hidden]
Date: 2012-04-25 01:51:25

Author: olli
Date: 2012-04-25 01:51:24 EDT (Wed, 25 Apr 2012)
New Revision: 78189

context: documentation regarding to fpu preserving

Text files modified:
   trunk/libs/context/doc/fcontext.qbk | 11 +++++++++++
   1 files changed, 11 insertions(+), 0 deletions(-)

Modified: trunk/libs/context/doc/fcontext.qbk
--- trunk/libs/context/doc/fcontext.qbk (original)
+++ trunk/libs/context/doc/fcontext.qbk 2012-04-25 01:51:24 EDT (Wed, 25 Apr 2012)
@@ -178,6 +178,17 @@
 If the __context_fn__ emits an exception, the application will terminate.
+[heading Preserving floating point registers]
+Preserving the floating point registers increases the cycle count for a context
+switch (see performance tests).
+The foruth argument of __jump_fcontext__ controls if fpu registers should be
+preserved by the context jump.
+[important The use of the fpu controling argument of __jump_fcontext__ must
+be consistent in the application. Otherwise the behaviour is undefined.]
 [heading Stack unwinding]
 Sometimes it is necessary to unwind the stack of an unfinished context to

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