| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| /* |
| * Copyright (c) 2013 ARM Ltd |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the company may not be used to endorse or promote |
| * products derived from this software without specific prior written |
| * permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
| * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| .L_memcpy_base: |
| // Assumes that n >= 0, and dst, src are valid pointers. |
| // For any sizes less than 832 use the neon code that doesn't |
| // care about the src alignment. This avoids any checks |
| // for src alignment, and offers the best improvement since |
| // smaller sized copies are dominated by the overhead of |
| // the pre and post main loop. |
| // For larger copies, if src and dst cannot both be aligned to |
| // word boundaries, use the neon code. |
| // For all other copies, align dst to a double word boundary |
| // and copy using LDRD/STRD instructions. |
| |
| cmp r2, #16 |
| blo .L_copy_less_than_16_unknown_align |
| |
| .L_copy_unknown_alignment: |
| // Unknown alignment of src and dst. |
| // Assumes that the first few bytes have already been prefetched. |
| |
| // Align destination to 128 bits. The mainloop store instructions |
| // require this alignment or they will throw an exception. |
| rsb r3, r0, #0 |
| ands r3, r3, #0xF |
| beq 2f |
| |
| // Copy up to 15 bytes (count in r3). |
| sub r2, r2, r3 |
| movs ip, r3, lsl #31 |
| |
| itt mi |
| ldrbmi lr, [r1], #1 |
| strbmi lr, [r0], #1 |
| itttt cs |
| ldrbcs ip, [r1], #1 |
| ldrbcs lr, [r1], #1 |
| strbcs ip, [r0], #1 |
| strbcs lr, [r0], #1 |
| |
| movs ip, r3, lsl #29 |
| bge 1f |
| // Copies 4 bytes, dst 32 bits aligned before, at least 64 bits after. |
| vld4.8 {d0[0], d1[0], d2[0], d3[0]}, [r1]! |
| vst4.8 {d0[0], d1[0], d2[0], d3[0]}, [r0, :32]! |
| 1: bcc 2f |
| // Copies 8 bytes, dst 64 bits aligned before, at least 128 bits after. |
| vld1.8 {d0}, [r1]! |
| vst1.8 {d0}, [r0, :64]! |
| |
| 2: cmp r2, #256 |
| ble .L_copy_loop |
| |
| // Make sure DST is 64 BYTE aligned. |
| rsb r3, r0, #0 |
| ands r3, r3, #0x30 |
| beq .L_copy_loop |
| |
| sub r2, r2, r3 |
| cmp r3, #0x10 |
| beq .L_copy_16 |
| |
| vld1.8 {d0 - d3}, [r1]! |
| vst1.8 {d0 - d3}, [r0, :128]! |
| ands r3, r3, #0x10 |
| beq .L_copy_loop |
| |
| .L_copy_16: |
| vld1.8 {d0, d1}, [r1]! |
| vst1.8 {d0, d1}, [r0, :128]! |
| |
| .L_copy_loop: |
| // Make sure we have at least 64 bytes to copy. |
| subs r2, r2, #64 |
| blo 2f |
| |
| 1: // The main loop copies 64 bytes at a time. |
| vld1.8 {d0 - d3}, [r1]! |
| vst1.8 {d0 - d3}, [r0, :128]! |
| pld [r1, #(64*4)] |
| subs r2, r2, #64 |
| vld1.8 {d4 - d7}, [r1]! |
| vst1.8 {d4 - d7}, [r0, :128]! |
| bhs 1b |
| |
| 2: // Fix-up the remaining count and make sure we have >= 32 bytes left. |
| adds r2, r2, #32 |
| blo 3f |
| |
| // 32 bytes. These cache lines were already preloaded. |
| vld1.8 {d0 - d3}, [r1]! |
| sub r2, r2, #32 |
| vst1.8 {d0 - d3}, [r0, :128]! |
| 3: // Less than 32 left. |
| add r2, r2, #32 |
| tst r2, #0x10 |
| beq .L_copy_less_than_16_unknown_align |
| // Copies 16 bytes, destination 128 bits aligned. |
| vld1.8 {d0, d1}, [r1]! |
| vst1.8 {d0, d1}, [r0, :128]! |
| |
| .L_copy_less_than_16_unknown_align: |
| // Copy up to 15 bytes (count in r2). |
| movs ip, r2, lsl #29 |
| bcc 1f |
| vld1.8 {d0}, [r1]! |
| vst1.8 {d0}, [r0]! |
| 1: bge 2f |
| vld4.8 {d0[0], d1[0], d2[0], d3[0]}, [r1]! |
| vst4.8 {d0[0], d1[0], d2[0], d3[0]}, [r0]! |
| |
| 2: // Copy 0 to 4 bytes. |
| lsls r2, r2, #31 |
| itt ne |
| ldrbne lr, [r1], #1 |
| strbne lr, [r0], #1 |
| itttt cs |
| ldrbcs ip, [r1], #1 |
| ldrbcs lr, [r1] |
| strbcs ip, [r0], #1 |
| strbcs lr, [r0] |
| |
| pop {r0, pc} |
