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Diffstat (limited to 'c/src/exec/score/ChangeLog')
| -rw-r--r-- | c/src/exec/score/ChangeLog | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/c/src/exec/score/ChangeLog b/c/src/exec/score/ChangeLog index e84a79a7e1..64fd0a00d4 100644 --- a/c/src/exec/score/ChangeLog +++ b/c/src/exec/score/ChangeLog @@ -1,3 +1,24 @@ +2001-05-14 Till Straumann <strauman@slac.stanford.edu> + + * src/threaddispatch.c, src/threadhandler.c: Per PR211 fix + saving/restoring floating point context. The fpsave and fprestore + routines are only used in a executing context which _is_ fp and hence + has the FPU enabled. The current behavior required the FPU always to + be on which is very dangerous if lazy context switching is used. + [Joel Note: Some ports explicitly enabled the FPU in the FP save and + restore routines to avoid this.] + + The patch also makes sure (on powerpc only) that the FPU is disabled + for integer tasks. Note that this is crucial if deferred fp context + switching is used. Otherwise, fp context corruption may go undetected! + Also note that even tasks which merely push/pop FP registers to/from + the stack without modifying them still MUST be FP tasks - otherwise + (if lazy FP context switching is used), FP register corruption (of + other, FP, tasks may occur)! + + Furthermore, (on PPC) by default, lazy FP context save/restore + is _disabled_. + 2001-04-26 Joel Sherrill <joel@OARcorp.com> * src/objectcomparenamestring.c: Fix typos. |