From: David Howells <[email protected]>
Implement fls64() for FRV without recource to conditional jumps.
Signed-Off-By: David Howells <[email protected]>
---
include/asm-frv/bitops.h | 42 +++++++++++++++++++++++++++++++++++++++++-
1 files changed, 41 insertions(+), 1 deletions(-)
diff --git a/include/asm-frv/bitops.h b/include/asm-frv/bitops.h
index 97fb746..591eecc 100644
--- a/include/asm-frv/bitops.h
+++ b/include/asm-frv/bitops.h
@@ -186,7 +186,47 @@ ({ \
bit; \
})
-#include <asm-generic/bitops/fls64.h>
+/**
+ * fls64 - find last bit set in a 64-bit value
+ * @n: the value to search
+ *
+ * This is defined the same way as ffs:
+ * - return 64..1 to indicate bit 63..0 most significant bit set
+ * - return 0 to indicate no bits set
+ */
+static inline __attribute__((const))
+int fls64(u64 n)
+{
+ union {
+ u64 ll;
+ struct { u32 h, l; };
+ } _;
+ int bit, x, y;
+
+ _.ll = n;
+
+ asm(" subcc.p %3,gr0,gr0,icc0 \n"
+ " subcc %4,gr0,gr0,icc1 \n"
+ " ckne icc0,cc4 \n"
+ " ckne icc1,cc5 \n"
+ " norcr cc4,cc5,cc6 \n"
+ " csub.p %0,%0,%0 ,cc6,1 \n"
+ " orcr cc5,cc4,cc4 \n"
+ " andcr cc4,cc5,cc4 \n"
+ " cscan.p %3,gr0,%0 ,cc4,0 \n"
+ " setlos #64,%1 \n"
+ " cscan.p %4,gr0,%0 ,cc4,1 \n"
+ " setlos #32,%2 \n"
+ " csub.p %1,%0,%0 ,cc4,0 \n"
+ " csub %2,%0,%0 ,cc4,1 \n"
+ : "=&r"(bit), "=r"(x), "=r"(y)
+ : "0r"(_.h), "r"(_.l)
+ : "icc0", "icc1", "cc4", "cc5", "cc6"
+ );
+ return bit;
+
+}
+
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/hweight.h>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
