projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| dcc3b311 JS |
1 | .th FLT40 VI 8/22/77 |
| 2 | .sh NAME | |
| 3 | flt40 \- floating point assembly language speed up massager | |
| 4 | .sh SYNOPSIS | |
| 5 | .bd flt40 | |
| 6 | slowcode fastcode | |
| 7 | .sh DESCRIPTION | |
| 8 | .it Flt40 | |
| 9 | reads the assembly language program off the file | |
| 10 | .it slowcode | |
| 11 | and writes a transformed program on | |
| 12 | .it fastcode. | |
| 13 | The transformation consists of placing the statement | |
| 14 | .s3 | |
| 15 | .dt | |
| 16 | jsr pc,fpjsr | |
| 17 | .s3 | |
| 18 | before each group of floating point operations. | |
| 19 | On machines which don't have floating point hardware, this | |
| 20 | can speed execution time significantly, as the system overhead | |
| 21 | associated with floating point interpretation is eliminated. | |
| 22 | .s3 | |
| 23 | .it Flt40 | |
| 24 | is most appropriately called directly from the C compiler pre-processor | |
| 25 | .it cc; | |
| 26 | an option | |
| 27 | .bd \-F | |
| 28 | to call | |
| 29 | .it flt40 | |
| 30 | is a useful addition on machines without floating point hardware. | |
| 31 | .sh AUTHOR | |
| 32 | Jeff Schriebman | |
| 33 | .sh BUGS | |
| 34 | The name | |
| 35 | .it flt40 | |
| 36 | is an anachronism; | |
| 37 | the program works perfectly well on 11/45's and 70's. | |
| 38 | .s3 | |
| 39 | The input is recognized only if it is in C format; | |
| 40 | thus there can be no leading tabs before operation codes. |