| Christopher Ferris | 7c83a1e | 2013-02-26 01:30:00 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2008 The Android Open Source Project |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 16 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 17 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 18 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 19 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 22 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 25 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include <machine/cpu-features.h> |
| 30 | #include <machine/asm.h> |
| 31 | |
| 32 | /* |
| 33 | * This code assumes it is running on a processor that supports all arm v7 |
| 34 | * instructions, that supports neon instructions, and that supports |
| 35 | * unaligned neon instruction accesses to memory. |
| 36 | */ |
| 37 | |
| 38 | .fpu neon |
| 39 | |
| 40 | ENTRY(bzero) |
| 41 | mov r2, r1 |
| 42 | mov r1, #0 |
| 43 | END(bzero) |
| 44 | |
| 45 | /* memset() returns its first argument. */ |
| 46 | ENTRY(memset) |
| 47 | .save {r0} |
| 48 | stmfd sp!, {r0} |
| 49 | |
| 50 | vdup.8 q0, r1 |
| 51 | |
| 52 | /* make sure we have at least 32 bytes to write */ |
| 53 | subs r2, r2, #32 |
| 54 | blo 2f |
| 55 | vmov q1, q0 |
| 56 | |
| 57 | 1: /* The main loop writes 32 bytes at a time */ |
| 58 | subs r2, r2, #32 |
| 59 | vst1.8 {d0 - d3}, [r0]! |
| 60 | bhs 1b |
| 61 | |
| 62 | 2: /* less than 32 left */ |
| 63 | add r2, r2, #32 |
| 64 | tst r2, #0x10 |
| 65 | beq 3f |
| 66 | |
| 67 | // writes 16 bytes, 128-bits aligned |
| 68 | vst1.8 {d0, d1}, [r0]! |
| 69 | 3: /* write up to 15-bytes (count in r2) */ |
| 70 | movs ip, r2, lsl #29 |
| 71 | bcc 1f |
| 72 | vst1.8 {d0}, [r0]! |
| 73 | 1: bge 2f |
| 74 | vst1.32 {d0[0]}, [r0]! |
| 75 | 2: movs ip, r2, lsl #31 |
| 76 | strmib r1, [r0], #1 |
| 77 | strcsb r1, [r0], #1 |
| 78 | strcsb r1, [r0], #1 |
| 79 | ldmfd sp!, {r0} |
| 80 | bx lr |
| 81 | END(memset) |