Release notes for Linux Kernel VFP support code
Date: 20 May 2004
Author: Russell King
This is the first release of the Linux Kernel VFP support code. It
provides support for the exceptions bounced from VFP hardware found
on ARM926EJ-S.
This release has been validated against the SoftFloat-2b library by
John R. Hauser using the TestFloat-2a test suite. Details of this
library and test suite can be found at:
http://www.jhauser.us/arithmetic/SoftFloat.html
The operations which have been tested with this package are:
- fdiv
- fsub
- fadd
- fmul
- fcmp
- fcmpe
- fcvtd
- fcvts
- fsito
- ftosi
- fsqrt
All the above pass softfloat tests with the following exceptions:
- fadd/fsub shows some differences in the handling of +0 / -0 results
when input operands differ in signs. - the handling of underflow exceptions is slightly different. If a
result underflows before rounding, but becomes a normalised number
after rounding, we do not signal an underflow exception.
Other operations which have been tested by basic assembly-only tests
are:
- fcpy
- fabs
- fneg
- ftoui
- ftosiz
- ftouiz
The combination operations have not been tested:
- fmac
- fnmac
- fmsc
- fnmsc
- fnmul
