projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | Release notes for Linux Kernel VFP support code |
| 2 | ----------------------------------------------- | |
| 3 | ||
| 4 | Date: 20 May 2004 | |
| 5 | Author: Russell King | |
| 6 | ||
| 7 | This is the first release of the Linux Kernel VFP support code. It | |
| 8 | provides support for the exceptions bounced from VFP hardware found | |
| 9 | on ARM926EJ-S. | |
| 10 | ||
| 11 | This release has been validated against the SoftFloat-2b library by | |
| 12 | John R. Hauser using the TestFloat-2a test suite. Details of this | |
| 13 | library and test suite can be found at: | |
| 14 | ||
| 98766fbe | 15 | http://www.jhauser.us/arithmetic/SoftFloat.html |
| 1da177e4 LT |
16 | |
| 17 | The operations which have been tested with this package are: | |
| 18 | ||
| 19 | - fdiv | |
| 20 | - fsub | |
| 21 | - fadd | |
| 22 | - fmul | |
| 23 | - fcmp | |
| 24 | - fcmpe | |
| 25 | - fcvtd | |
| 26 | - fcvts | |
| 27 | - fsito | |
| 28 | - ftosi | |
| 29 | - fsqrt | |
| 30 | ||
| 31 | All the above pass softfloat tests with the following exceptions: | |
| 32 | ||
| 33 | - fadd/fsub shows some differences in the handling of +0 / -0 results | |
| 34 | when input operands differ in signs. | |
| 35 | - the handling of underflow exceptions is slightly different. If a | |
| 36 | result underflows before rounding, but becomes a normalised number | |
| 37 | after rounding, we do not signal an underflow exception. | |
| 38 | ||
| 39 | Other operations which have been tested by basic assembly-only tests | |
| 40 | are: | |
| 41 | ||
| 42 | - fcpy | |
| 43 | - fabs | |
| 44 | - fneg | |
| 45 | - ftoui | |
| 46 | - ftosiz | |
| 47 | - ftouiz | |
| 48 | ||
| 49 | The combination operations have not been tested: | |
| 50 | ||
| 51 | - fmac | |
| 52 | - fnmac | |
| 53 | - fmsc | |
| 54 | - fnmsc | |
| 55 | - fnmul |