Messages in this thread Patch in this message | | | From | Dave Rodgman <> | Subject | [PATCH v5 2/3] lib/lzo: 64-bit CTZ on arm64 | Date | Tue, 5 Feb 2019 14:20:07 +0000 |
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From: Matt Sealey <matt.sealey@arm.com>
LZO leaves some performance on the table by not realising that arm64 can optimize count-trailing-zeros bit operations.
Add CONFIG_ARM64 to the checked definitions alongside CONFIG_X86_64 to enable the use of rbit/clz instructions on full 64-bit quantities.
Link: http://lkml.kernel.org/r/20181127161913.23863-5-dave.rodgman@arm.com Signed-off-by: Matt Sealey <matt.sealey@arm.com> Signed-off-by: Dave Rodgman <dave.rodgman@arm.com> Cc: David S. Miller <davem@davemloft.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Markus F.X.J. Oberhumer <markus@oberhumer.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <nitingupta910@gmail.com> Cc: Richard Purdie <rpurdie@openedhand.com> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Sonny Rao <sonnyrao@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> --- lib/lzo/lzodefs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/lzo/lzodefs.h b/lib/lzo/lzodefs.h index 497f9c9f03a8..00d1080155e4 100644 --- a/lib/lzo/lzodefs.h +++ b/lib/lzo/lzodefs.h @@ -25,7 +25,7 @@ #if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN) #error "conflicting endian definitions" -#elif defined(CONFIG_X86_64) +#elif defined(CONFIG_X86_64) || defined(CONFIG_ARM64) #define LZO_USE_CTZ64 1 #define LZO_USE_CTZ32 1 #elif defined(CONFIG_X86) || defined(CONFIG_PPC) -- 2.17.1
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