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MIPS: microMIPS: Optimise 'strlen' core library function.

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Optimise 'strlen' to use microMIPS instructions and/or optimisations
for binary size reduction. When the microMIPS ISA is not being used,
the library function compiles to the original binary code.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
This commit is contained in:
Steven J. Hill 2013-03-25 13:41:47 -05:00 committed by Ralf Baechle
parent 0131f2b2c9
commit b1bac37345
1 changed files with 5 additions and 4 deletions
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9
arch/mips/lib/strlen_user.S
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@ -3,8 +3,9 @@
* License. See the file "COPYING" in the main directory of this archive * License. See the file "COPYING" in the main directory of this archive
* for more details. * for more details.
* *
* Copyright (c) 1996, 1998, 1999, 2004 by Ralf Baechle * Copyright (C) 1996, 1998, 1999, 2004 by Ralf Baechle
* Copyright (c) 1999 Silicon Graphics, Inc. * Copyright (C) 1999 Silicon Graphics, Inc.
* Copyright (C) 2011 MIPS Technologies, Inc.
*/ */
#include <asm/asm.h> #include <asm/asm.h>
#include <asm/asm-offsets.h> #include <asm/asm-offsets.h>
@ -28,9 +29,9 @@ LEAF(__strlen_user_asm)
FEXPORT(__strlen_user_nocheck_asm) FEXPORT(__strlen_user_nocheck_asm)
move v0, a0 move v0, a0
1: EX(lb, t0, (v0), .Lfault) 1: EX(lbu, v1, (v0), .Lfault)
PTR_ADDIU v0, 1 PTR_ADDIU v0, 1
bnez t0, 1b bnez v1, 1b
PTR_SUBU v0, a0 PTR_SUBU v0, a0
jr ra jr ra
END(__strlen_user_asm) END(__strlen_user_asm)