| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273 |
- TEXT memset(SB),$0
- #define BDNZ BC 16,0,
- MOVW R3, p+0(FP) /* R3 is pointer */
- /*
- * performance:
- * about 100mbytes/sec (8k blocks) on a 603/105 without L2 cache
- * drops to 40mbytes/sec (10k blocks) and 28mbytes/sec with 32k blocks
- */
- MOVW n+8(FP), R4 /* R4 is count */
- CMP R4, $0
- BLE ret
- MOVW c+4(FP), R5 /* R5 is char */
- /*
- * create 16 copies of c in R5 .. R8
- */
- RLWNM $0, R5, $0xff, R5
- RLWMI $8, R5, $0xff00, R5
- RLWMI $16, R5, $0xffff0000, R5
- MOVW R5, R6
- MOVW R5, R7
- MOVW R5, R8
- /*
- * let STSW do the work for 16 characters or less; aligned and unaligned
- */
- CMP R4, $16
- BLE out
- /*
- * store enough bytes to align pointer
- */
- ANDCC $7,R3, R9
- BEQ l2
- SUBC R9, $8, R9
- MOVW R9, XER
- STSW R5, (R3)
- ADD R9, R3
- SUB R9, R4
- /*
- * store 16 at a time while there's room
- * STSW was used here originally, but it's `completion serialised'
- */
- l2:
- SRAWCC $4, R4, R9
- BLE out
- MOVW R9, CTR
- l3:
- MOVW R5, 0(R3)
- ADD $8, R3, R10
- MOVW R6, 4(R3)
- MOVW R7, 0(R10)
- ADD $8, R10, R3
- MOVW R8, 4(R10)
- BDNZ l3
- RLWNMCC $0, R4, $15, R4 /* residue */
- BEQ ret
- /*
- * store up to 16 bytes from R5 .. R8; aligned and unaligned
- */
- out:
- MOVW R4, XER
- STSW R5, (R3)
- ret:
- MOVW 0(FP), R3
- RETURN
- END
|
