| * arch/alpha/lib/ev67-strcat.S |
| * 21264 version contributed by Rick Gorton <rick.gorton@alpha-processor.com> |
| * Append a null-terminated string from SRC to DST. |
| * Much of the information about 21264 scheduling/coding comes from: |
| * Compiler Writer's Guide for the Alpha 21264 |
| * abbreviated as 'CWG' in other comments here |
| * ftp.digital.com/pub/Digital/info/semiconductor/literature/dsc-library.html |
| * U - upper subcluster; U0 - subcluster U0; U1 - subcluster U1 |
| * L - lower subcluster; L0 - subcluster L0; L1 - subcluster L1 |
| * Try not to change the actual algorithm if possible for consistency. |
| * Commentary: It seems bogus to walk the input string twice - once |
| * to determine the length, and then again while doing the copy. |
| * A significant (future) enhancement would be to only read the input |
| mov $16, $0 # E : set up return value |
| /* Find the end of the string. */ |
| ldq_u $1, 0($16) # L : load first quadword (a0 may be misaligned) |
| cmpbge $31, $1, $2 # E : bits set iff byte == 0 |
| $loop: ldq $1, 8($16) # L : |
| $found: cttz $2, $3 # U0 : |