Patchwork [2/3] bitops: Add rotate functions (rol8, ror8, ...)

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Submitter Stefan Weil
Date Sept. 12, 2013, 7:13 p.m.
Message ID <1379013193-20691-3-git-send-email-sw@weilnetz.de>
Download mbox | patch
Permalink /patch/274596/
State Superseded
Headers show

Comments

Stefan Weil - Sept. 12, 2013, 7:13 p.m.
These functions were copies from include/linux/bitopts.h.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
---
 include/qemu/bitops.h |   82 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
Richard Henderson - Sept. 12, 2013, 7:24 p.m.
On 09/12/2013 12:13 PM, Stefan Weil wrote:
> These functions were copies from include/linux/bitopts.h.
> 
> Signed-off-by: Stefan Weil <sw@weilnetz.de>
> ---
>  include/qemu/bitops.h |   82 +++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 82 insertions(+)

Reviewed-by: Richard Henderson <rth@twiddle.net>


r~

Patch

diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 06e2e6f..5c0fa0a 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -184,6 +184,86 @@  static inline unsigned long hweight_long(unsigned long w)
 }
 
 /**
+ * rol8 - rotate an 8-bit value left
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline uint8_t rol8(uint8_t word, unsigned int shift)
+{
+    return (word << shift) | (word >> (8 - shift));
+}
+
+/**
+ * ror8 - rotate an 8-bit value right
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline uint8_t ror8(uint8_t word, unsigned int shift)
+{
+    return (word >> shift) | (word << (8 - shift));
+}
+
+/**
+ * rol16 - rotate a 16-bit value left
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline uint16_t rol16(uint16_t word, unsigned int shift)
+{
+    return (word << shift) | (word >> (16 - shift));
+}
+
+/**
+ * ror16 - rotate a 16-bit value right
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline uint16_t ror16(uint16_t word, unsigned int shift)
+{
+    return (word >> shift) | (word << (16 - shift));
+}
+
+/**
+ * rol32 - rotate a 32-bit value left
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline uint32_t rol32(uint32_t word, unsigned int shift)
+{
+    return (word << shift) | (word >> (32 - shift));
+}
+
+/**
+ * ror32 - rotate a 32-bit value right
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline uint32_t ror32(uint32_t word, unsigned int shift)
+{
+    return (word >> shift) | (word << (32 - shift));
+}
+
+/**
+ * rol64 - rotate a 64-bit value left
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline uint64_t rol64(uint64_t word, unsigned int shift)
+{
+    return (word << shift) | (word >> (64 - shift));
+}
+
+/**
+ * ror64 - rotate a 64-bit value right
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline uint64_t ror64(uint64_t word, unsigned int shift)
+{
+    return (word >> shift) | (word << (64 - shift));
+}
+
+/**
  * extract32:
  * @value: the value to extract the bit field from
  * @start: the lowest bit in the bit field (numbered from 0)