linux/arch/cris
Jesper Nilsson 77a746cec5 cris: import memset.c from newlib: fixes compile error with newer (pre4.3) gcc
Adrian Bunk reported the following compile error with a SVN head GCC:

...
CC arch/cris/arch-v10/lib/memset.o
/home/bunk/linux/kernel-2.6/git/linux-2.6/arch/cris/arch-v10/lib/memset.c: In function 'memset':
/home/bunk/linux/kernel-2.6/git/linux-2.6/arch/cris/arch-v10/lib/memset.c:164: error: lvalue required as increment operand
/home/bunk/linux/kernel-2.6/git/linux-2.6/arch/cris/arch-v10/lib/memset.c:165: error: lvalue required as increment operand
/home/bunk/linux/kernel-2.6/git/linux-2.6/arch/cris/arch-v10/lib/memset.c:166: error: lvalue required as increment operand
/home/bunk/linux/kernel-2.6/git/linux-2.6/arch/cris/arch-v10/lib/memset.c:167: error: lvalue required as increment operand
/home/bunk/linux/kernel-2.6/git/linux-2.6/arch/cris/arch-v10/lib/memset.c:185: error: lvalue required as increment operand
/home/bunk/linux/kernel-2.6/git/linux-2.6/arch/cris/arch-v10/lib/memset.c:189: error: lvalue required as increment operand
/home/bunk/linux/kernel-2.6/git/linux-2.6/arch/cris/arch-v10/lib/memset.c:192: error: lvalue required as increment operand
... etc ...

This is due to the use of the construct:

	*((long*)dst)++ = lc;

Which is no longer legal since casts don't return an lvalue.

The solution is to import the implementation from newlib,
which is continually autotested together with GCC mainline,
and uses the construct:

	*(long *) dst = lc; dst += 4;

With this change, the generated code actually shrinks 76 bytes
since gcc notices that it can use autoincrement for the move
instruction in CRIS.

   text    data     bss     dec     hex filename
    304       0       0     304     130 memset.old.o
   text    data     bss     dec     hex filename
    228       0       0     228      e4 memset.o

Since this is an import of a file from newlib, I'm not touching
the formatting or correcting any checkpatch errors.

Note also that even if the two files for the CRIS v10 and CRIS v32
are identical at the moment, it might be possible to tweak the
CRIS v32 version. Thus, I'm not yet folding them into the same file,
at least not until we've done some research on it.

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Mikael Starvik <mikael.starvik@axis.com>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-14 20:58:04 -08:00
..
arch-v10 cris: import memset.c from newlib: fixes compile error with newer (pre4.3) gcc 2008-02-14 20:58:04 -08:00
arch-v32 cris: import memset.c from newlib: fixes compile error with newer (pre4.3) gcc 2008-02-14 20:58:04 -08:00
kernel procfs: constify function pointer tables 2008-02-08 09:22:38 -08:00
mm CRIS: Minor fixes to mm/fault.c 2008-02-08 11:06:24 +01:00
artpec_3_defconfig CRIS: Remove CONFIG_NO_IOMEM from ARTPEC-3 default config. 2008-02-08 11:06:37 +01:00
defconfig CRIS: Remove CONFIG_NO_IOMEM from default configs. 2008-02-08 11:06:36 +01:00
etraxfs_defconfig CRIS: Remove CONFIG_NO_IOMEM from default configs. 2008-02-08 11:06:36 +01:00
Kconfig ide: introduce HAVE_IDE 2008-02-09 10:46:40 +01:00
Kconfig.debug [PATCH] arch/cris/Kconfig.debug: use lib/Kconfig.debug 2005-09-05 00:06:19 -07:00
Makefile CRIS: Update main Kbuild makefile. 2008-02-08 11:06:25 +01:00