Diff: EthernetInterface/lwip-sys/arch/memcpy.c

Revision:

9:58eb378727d9

Parent:

8:80d49dd91542

Child:

10:0b5e0dfee08e

--- a/EthernetInterface/lwip-sys/arch/memcpy.c	Wed Oct 01 13:27:35 2014 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,59 +0,0 @@
-/* Copyright (C) 2013 - Adam Green (https://github.com/adamgreen)
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-#if defined(TOOLCHAIN_GCC) && defined(__thumb2__)
-
-#include <stdio.h>
-
-
-/* This is a hand written Thumb-2 assembly language version of the
-   standard C memcpy() function that can be used by the lwIP networking
-   stack to improve its performance.  It copies 4 bytes at a time and
-   unrolls the loop to perform 4 of these copies per loop iteration.
-*/
-__attribute__((naked)) void thumb2_memcpy(void* pDest, const void* pSource, size_t length)
-{
-    __asm (
-        ".syntax unified\n"
-        ".thumb\n"
-
-        // Copy 16 bytes at a time first.
-        "    lsrs    r3, r2, #4\n"
-        "    beq.n   2$\n"
-        "1$: ldr     r12, [r1], #4\n"
-        "    str     r12, [r0], #4\n"
-        "    ldr     r12, [r1], #4\n"
-        "    str     r12, [r0], #4\n"
-        "    ldr     r12, [r1], #4\n"
-        "    str     r12, [r0], #4\n"
-        "    ldr     r12, [r1], #4\n"
-        "    str     r12, [r0], #4\n"
-        "    subs    r3, #1\n"
-        "    bne     1$\n"
-
-        // Copy byte by byte for what is left.
-        "2$:\n"
-        "    ands    r3, r2, #0xf\n"
-        "    beq.n   4$\n"
-        "3$: ldrb    r12, [r1], #1\n"
-        "    strb    r12, [r0], #1\n"
-        "    subs    r3, #1\n"
-        "    bne     3$\n"
-
-        // Return to caller.
-        "4$: bx      lr\n"
-    );
-}
-
-#endif