Clang is pickier than GCC for the register size in asm statement. It expects
the register size to match the value size.
The instruction clz is expecting the two operands to be the same size
(i.e 32-bit or 64-bit). As the flsl function is dealing with 64-bit
value, we need to make the destination variable 64-bit as well.
While at it, add a newline before the return statement.
Signed-off-by: Julien Grall <julien.gr...@arm.com>
---
xen/include/asm-arm/arm64/bitops.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/xen/include/asm-arm/arm64/bitops.h
b/xen/include/asm-arm/arm64/bitops.h
index 6bf1922680..05045f1109 100644
--- a/xen/include/asm-arm/arm64/bitops.h
+++ b/xen/include/asm-arm/arm64/bitops.h
@@ -34,12 +34,13 @@ static /*__*/always_inline unsigned long __ffs(unsigned
long word)
static inline int flsl(unsigned long x)
{
- int ret;
+ uint64_t ret;
if (__builtin_constant_p(x))
return generic_flsl(x);
asm("clz\t%0, %1" : "=r" (ret) : "r" (x));
+
return BITS_PER_LONG - ret;
}
--
2.11.0
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