* [PATCH] qnx4: Use hweight8
@ 2009-11-13 7:06 Akinobu Mita
2009-11-13 9:25 ` Anders Larsen
0 siblings, 1 reply; 4+ messages in thread
From: Akinobu Mita @ 2009-11-13 7:06 UTC (permalink / raw)
To: akpm, linux-kernel; +Cc: Akinobu Mita, Anders Larsen, Al Viro
Use hweight8 instead of counting for each bit
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Anders Larsen <al@alarsen.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
---
fs/qnx4/bitmap.c | 17 +----------------
1 files changed, 1 insertions(+), 16 deletions(-)
diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c
index 0afba06..b913e3d 100644
--- a/fs/qnx4/bitmap.c
+++ b/fs/qnx4/bitmap.c
@@ -35,22 +35,7 @@ static void count_bits(register const char *bmPart, register int size,
}
do {
b = *bmPart++;
- if ((b & 1) == 0)
- tot++;
- if ((b & 2) == 0)
- tot++;
- if ((b & 4) == 0)
- tot++;
- if ((b & 8) == 0)
- tot++;
- if ((b & 16) == 0)
- tot++;
- if ((b & 32) == 0)
- tot++;
- if ((b & 64) == 0)
- tot++;
- if ((b & 128) == 0)
- tot++;
+ tot += hweight8(b);
size--;
} while (size != 0);
*tf = tot;
--
1.6.5.1
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] qnx4: Use hweight8
2009-11-13 7:06 [PATCH] qnx4: Use hweight8 Akinobu Mita
@ 2009-11-13 9:25 ` Anders Larsen
2009-11-13 9:57 ` [PATCH v2] " Akinobu Mita
0 siblings, 1 reply; 4+ messages in thread
From: Anders Larsen @ 2009-11-13 9:25 UTC (permalink / raw)
To: Akinobu Mita; +Cc: akpm, linux-kernel, Akinobu Mita, Al Viro
On 2009-11-13 08:06:18, Akinobu Mita wrote:
> Use hweight8 instead of counting for each bit
>
> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
> Cc: Anders Larsen <al@alarsen.net>
> Cc: Al Viro <viro@zeniv.linux.org.uk>
The original code counted the number of zeroes whereas hweight8() counts ones, so
NAK
(hint: "tot += 8 - hweight8(b)" should do the trick)
Cheers
Anders
> ---
> fs/qnx4/bitmap.c | 17 +----------------
> 1 files changed, 1 insertions(+), 16 deletions(-)
>
> diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c
> index 0afba06..b913e3d 100644
> --- a/fs/qnx4/bitmap.c
> +++ b/fs/qnx4/bitmap.c
> @@ -35,22 +35,7 @@ static void count_bits(register const char *bmPart, register int size,
> }
> do {
> b = *bmPart++;
> - if ((b & 1) == 0)
> - tot++;
> - if ((b & 2) == 0)
> - tot++;
> - if ((b & 4) == 0)
> - tot++;
> - if ((b & 8) == 0)
> - tot++;
> - if ((b & 16) == 0)
> - tot++;
> - if ((b & 32) == 0)
> - tot++;
> - if ((b & 64) == 0)
> - tot++;
> - if ((b & 128) == 0)
> - tot++;
> + tot += hweight8(b);
> size--;
> } while (size != 0);
> *tf = tot;
> --
> 1.6.5.1
^ permalink raw reply [flat|nested] 4+ messages in thread* [PATCH v2] qnx4: Use hweight8
2009-11-13 9:25 ` Anders Larsen
@ 2009-11-13 9:57 ` Akinobu Mita
2009-11-13 10:11 ` Anders Larsen
0 siblings, 1 reply; 4+ messages in thread
From: Akinobu Mita @ 2009-11-13 9:57 UTC (permalink / raw)
To: akpm, linux-kernel; +Cc: Akinobu Mita, Anders Larsen, Al Viro
> The original code counted the number of zeroes whereas hweight8() counts ones, so
>
> NAK
>
> (hint: "tot += 8 - hweight8(b)" should do the trick)
Oops,
Subject: [PATCH v2] qnx4: Use hweight8
Use hweight8 instead of counting for each bit
[ v2: count_bit() counts zero bits in the bitmap]
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Anders Larsen <al@alarsen.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
---
fs/qnx4/bitmap.c | 17 +----------------
1 files changed, 1 insertions(+), 16 deletions(-)
diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c
index 0afba06..cbaae72 100644
--- a/fs/qnx4/bitmap.c
+++ b/fs/qnx4/bitmap.c
@@ -35,22 +35,7 @@ static void count_bits(register const char *bmPart, register int size,
}
do {
b = *bmPart++;
- if ((b & 1) == 0)
- tot++;
- if ((b & 2) == 0)
- tot++;
- if ((b & 4) == 0)
- tot++;
- if ((b & 8) == 0)
- tot++;
- if ((b & 16) == 0)
- tot++;
- if ((b & 32) == 0)
- tot++;
- if ((b & 64) == 0)
- tot++;
- if ((b & 128) == 0)
- tot++;
+ tot += 8 - hweight8(b);
size--;
} while (size != 0);
*tf = tot;
--
1.6.5.1
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v2] qnx4: Use hweight8
2009-11-13 9:57 ` [PATCH v2] " Akinobu Mita
@ 2009-11-13 10:11 ` Anders Larsen
0 siblings, 0 replies; 4+ messages in thread
From: Anders Larsen @ 2009-11-13 10:11 UTC (permalink / raw)
To: Akinobu Mita; +Cc: akpm, linux-kernel, Akinobu Mita, Al Viro
On 2009-11-13 10:57:45, Akinobu Mita wrote:
> Oops,
>
> Subject: [PATCH v2] qnx4: Use hweight8
>
> Use hweight8 instead of counting for each bit
>
> [ v2: count_bit() counts zero bits in the bitmap]
>
> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
> Cc: Anders Larsen <al@alarsen.net>
> Cc: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Anders Larsen <al@alarsen.net>
> ---
> fs/qnx4/bitmap.c | 17 +----------------
> 1 files changed, 1 insertions(+), 16 deletions(-)
>
> diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c
> index 0afba06..cbaae72 100644
> --- a/fs/qnx4/bitmap.c
> +++ b/fs/qnx4/bitmap.c
> @@ -35,22 +35,7 @@ static void count_bits(register const char *bmPart, register int size,
> }
> do {
> b = *bmPart++;
> - if ((b & 1) == 0)
> - tot++;
> - if ((b & 2) == 0)
> - tot++;
> - if ((b & 4) == 0)
> - tot++;
> - if ((b & 8) == 0)
> - tot++;
> - if ((b & 16) == 0)
> - tot++;
> - if ((b & 32) == 0)
> - tot++;
> - if ((b & 64) == 0)
> - tot++;
> - if ((b & 128) == 0)
> - tot++;
> + tot += 8 - hweight8(b);
> size--;
> } while (size != 0);
> *tf = tot;
> --
> 1.6.5.1
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2009-11-13 10:12 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2009-11-13 7:06 [PATCH] qnx4: Use hweight8 Akinobu Mita
2009-11-13 9:25 ` Anders Larsen
2009-11-13 9:57 ` [PATCH v2] " Akinobu Mita
2009-11-13 10:11 ` Anders Larsen
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