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s390/bitops: use flogr instruction to implement __ffs, ffs, __fls, fls and fls64
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Thu, 19 Sep 2013 09:05:32 +0000 (11:05 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 24 Oct 2013 15:16:55 +0000 (17:16 +0200)
commitb1cb7e2b6c3e8758e7406422b66c54c066737977
treec1ded2c6d6a2709718e25b22f36fe1442e5495a5tree | snapshot (tar.gz zip)
parent746479cdcbb131a0645e8cb4a35d6b26126e3e4ccommit | diff
s390/bitops: use flogr instruction to implement __ffs, ffs, __fls, fls and fls64

Since z9 109 we have the flogr instruction which can be used to implement
optimized versions of __ffs, ffs, __fls, fls and fls64.
So implement and use them, instead of the generic variants.
This reduces the size of the kernel image (defconfig, -march=z9-109)
by 19,648 bytes.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/include/asm/bitops.h diff | blob | blame | history