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-/*
- * arch/alpha/lib/ev67-strncat.S
- * 21264 version contributed by Rick Gorton <rick.gorton@api-networks.com>
- *
- * Append no more than COUNT characters from the null-terminated string SRC
- * to the null-terminated string DST. Always null-terminate the new DST.
- *
- * This differs slightly from the semantics in libc in that we never write
- * past count, whereas libc may write to count+1. This follows the generic
- * implementation in lib/string.c and is, IMHO, more sensible.
- *
- * 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
- * Scheduling notation:
- * E - either cluster
- * 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.
- */
-
-
- .text
-
- .align 4
- .globl strncat
- .ent strncat
-strncat:
- .frame $30, 0, $26
- .prologue 0
-
- mov $16, $0 # set up return value
- beq $18, $zerocount # U :
- /* Find the end of the string. */
- ldq_u $1, 0($16) # L : load first quadword ($16 may be misaligned)
- lda $2, -1($31) # E :
-
- insqh $2, $0, $2 # U :
- andnot $16, 7, $16 # E :
- nop # E :
- or $2, $1, $1 # E :
-
- nop # E :
- nop # E :
- cmpbge $31, $1, $2 # E : bits set iff byte == 0
- bne $2, $found # U :
-
-$loop: ldq $1, 8($16) # L :
- addq $16, 8, $16 # E :
- cmpbge $31, $1, $2 # E :
- beq $2, $loop # U :
-
-$found: cttz $2, $3 # U0 :
- addq $16, $3, $16 # E :
- nop # E :
- bsr $23, __stxncpy # L0 :/* Now do the append. */
-
- /* Worry about the null termination. */
-
- zapnot $1, $27, $2 # U : was last byte a null?
- cmplt $27, $24, $5 # E : did we fill the buffer completely?
- bne $2, 0f # U :
- ret # L0 :
-
-0: or $5, $18, $2 # E :
- nop
- bne $2, 2f # U :
- and $24, 0x80, $3 # E : no zero next byte
-
- nop # E :
- bne $3, 1f # U :
- /* Here there are bytes left in the current word. Clear one. */
- addq $24, $24, $24 # E : end-of-count bit <<= 1
- nop # E :
-
-2: zap $1, $24, $1 # U :
- nop # E :
- stq_u $1, 0($16) # L :
- ret # L0 :
-
-1: /* Here we must clear the first byte of the next DST word */
- stb $31, 8($16) # L :
- nop # E :
- nop # E :
- ret # L0 :
-
-$zerocount:
- nop # E :
- nop # E :
- nop # E :
- ret # L0 :
-
- .end strncat