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[v2,08/16] bitops: Add ONES macro

Message ID d2173a18bf2637c9e366ef09fab9b7611bed0a6c.1453237258.git.alistair.francis@xilinx.com (mailing list archive)
State New, archived
Headers show

Commit Message

Alistair Francis Jan. 19, 2016, 10:35 p.m. UTC 
From: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

Little macro that just gives you N ones (justified to LSB).

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
---

 include/qemu/bitops.h | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 8164225..27bf98d 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -430,4 +430,6 @@  static inline uint64_t deposit64(uint64_t value, int start, int length,
     return (value & ~mask) | ((fieldval << start) & mask);
 }
 
+#define ONES(num) ((num) == 64 ? ~0ull : (1ull << (num)) - 1)
+
 #endif