ArmPkg/CompilerIntrinsicsLib: Make __aeabi_memcpy the same as memcpy

This code also removed some redundant instructions.

__aeabi_memcpy doesn't require preservation of r0 (as memcpy does),
which could save a push, but the code has been left to keep things consistent.

The reason __aeabi_memcpy has been added to the .S file is so it will be available
to toolchains that use the GCC assembler but the full ARM EABI (i.e. current LLVM)

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15124 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Olivier Martin
2014-01-15 12:24:31 +00:00
committed by oliviermartin
parent 92720fe9c9
commit cf9530e686
2 changed files with 21 additions and 22 deletions

View File

@@ -1,4 +1,4 @@
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
//
// Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
//
@@ -27,14 +27,15 @@
; );
;
__aeabi_memcpy
CMP r2, #0
BXEQ r14
loop
LDRB r3, [r1], #1
STRB r3, [r0], #1
SUBS r2, r2, #1
BXEQ r14
B loop
END
cmp r2, #0
bxeq lr
push {lr}
mov lr, r0
L5
ldrb r3, [r1], #1
strb r3, [lr], #1
subs r2, r2, #1
bne L5
pop {pc}
END