diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/alpha/lib/ev67-strlen.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/alpha/lib/ev67-strlen.S | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/ANDROID_3.4.5/arch/alpha/lib/ev67-strlen.S b/ANDROID_3.4.5/arch/alpha/lib/ev67-strlen.S deleted file mode 100644 index 50392807..00000000 --- a/ANDROID_3.4.5/arch/alpha/lib/ev67-strlen.S +++ /dev/null @@ -1,49 +0,0 @@ -/* - * arch/alpha/lib/ev67-strlen.S - * 21264 version by Rick Gorton <rick.gorton@alpha-processor.com> - * - * Finds length of a 0-terminated string. Optimized for the - * Alpha architecture: - * - * - memory accessed as aligned quadwords only - * - uses bcmpge to compare 8 bytes in parallel - * - * 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 - */ - - .set noreorder - .set noat - - .globl strlen - .ent strlen - .align 4 -strlen: - ldq_u $1, 0($16) # L : load first quadword ($16 may be misaligned) - lda $2, -1($31) # E : - insqh $2, $16, $2 # U : - andnot $16, 7, $0 # E : - - or $2, $1, $1 # E : - cmpbge $31, $1, $2 # E : $2 <- bitmask: bit i == 1 <==> i-th byte == 0 - nop # E : - bne $2, $found # U : - -$loop: ldq $1, 8($0) # L : - addq $0, 8, $0 # E : addr += 8 - cmpbge $31, $1, $2 # E : - beq $2, $loop # U : - -$found: - cttz $2, $3 # U0 : - addq $0, $3, $0 # E : - subq $0, $16, $0 # E : - ret $31, ($26) # L0 : - - .end strlen |