Re: [PATCH 2/6] bitops.h: add sign_extend16 function

2014-12-15 Thread Martin Kepplinger 
Am 2014-12-15 um 17:18 schrieb Martin Kepplinger:
> This adds sign_exten16 to sign extend any signed value shorter than 16 bits
> to a s16.
> 
> Signed-off-by: Martin Kepplinger 
> ---
if you feel motivated, you can add this to the commit message:

Suggested-by: Christoph Muellner 

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[PATCH 2/6] bitops.h: add sign_extend16 function

2014-12-15 Thread Martin Kepplinger 
This adds sign_exten16 to sign extend any signed value shorter than 16 bits
to a s16.

Signed-off-by: Martin Kepplinger 
---
 include/linux/bitops.h | 11 +++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 3c2a539..70190f4 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -172,6 +172,17 @@ static inline __s8 sign_extend8(__u8 value, int index)
 }
 
 /**
+ * sign_extend16 - sign extend a 16-bit value using specified bit as sign-bit
+ * @value: value to sign extend
+ * @index: 0 based bit index (0<=index<16) to sign bit
+ */
+static inline __s16 sign_extend16(__u16 value, int index)
+{
+   __u8 shift = 15 - index;
+   return (__s16)(value << shift) >> shift;
+}
+
+/**
  * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit
  * @value: value to sign extend
  * @index: 0 based bit index (0<=index<32) to sign bit
-- 
2.1.3

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[PATCH 2/6] bitops.h: add sign_extend16 function

2014-12-15 Thread Martin Kepplinger 
This adds sign_exten16 to sign extend any signed value shorter than 16 bits
to a s16.

Signed-off-by: Martin Kepplinger mart...@posteo.de
---
 include/linux/bitops.h | 11 +++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 3c2a539..70190f4 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -172,6 +172,17 @@ static inline __s8 sign_extend8(__u8 value, int index)
 }
 
 /**
+ * sign_extend16 - sign extend a 16-bit value using specified bit as sign-bit
+ * @value: value to sign extend
+ * @index: 0 based bit index (0=index16) to sign bit
+ */
+static inline __s16 sign_extend16(__u16 value, int index)
+{
+   __u8 shift = 15 - index;
+   return (__s16)(value  shift)  shift;
+}
+
+/**
  * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit
  * @value: value to sign extend
  * @index: 0 based bit index (0=index32) to sign bit
-- 
2.1.3

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Re: [PATCH 2/6] bitops.h: add sign_extend16 function

2014-12-15 Thread Martin Kepplinger 
Am 2014-12-15 um 17:18 schrieb Martin Kepplinger:
 This adds sign_exten16 to sign extend any signed value shorter than 16 bits
 to a s16.
 
 Signed-off-by: Martin Kepplinger mart...@posteo.de
 ---
if you feel motivated, you can add this to the commit message:

Suggested-by: Christoph Muellner christoph.muell...@theobroma-systems.com

--
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/