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vppinfra: use byte swap builtins

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Type: improvement
Change-Id: I438206513b3cc3dedc0241b43c4ce037afa83e2b
Signed-off-by: Damjan Marion <damarion@cisco.com>
This commit is contained in:
Damjan Marion
2020-05-16 01:48:47 +02:00
committed by John Lo
parent 14a6c0e601
commit 97086e18a4
1 changed files with 3 additions and 41 deletions
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44
src/vppinfra/byte_order.h
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@ -56,14 +56,7 @@
always_inline u16
clib_byte_swap_u16 (u16 x)
{
#if defined (__aarch64__)
if (!__builtin_constant_p (x))
{
__asm__ ("rev16 %w0, %w0":"+r" (x));
return x;
}
#endif
return (x >> 8) | (x << 8);
return __builtin_bswap16 (x);
}
always_inline i16
@ -75,20 +68,7 @@ clib_byte_swap_i16 (i16 x)
always_inline u32
clib_byte_swap_u32 (u32 x)
{
#if defined (i386) || defined (__x86_64__)
if (!__builtin_constant_p (x))
{
asm volatile ("bswap %0":"=r" (x):"0" (x));
return x;
}
#elif defined (__aarch64__)
if (!__builtin_constant_p (x))
{
__asm__ ("rev %w0, %w0":"+r" (x));
return x;
}
#endif
return ((x << 24) | ((x & 0xff00) << 8) | ((x >> 8) & 0xff00) | (x >> 24));
return __builtin_bswap32 (x);
}
always_inline i32
@ -100,25 +80,7 @@ clib_byte_swap_i32 (i32 x)
always_inline u64
clib_byte_swap_u64 (u64 x)
{
#if defined (__x86_64__)
if (!__builtin_constant_p (x))
{
asm volatile ("bswapq %0":"=r" (x):"0" (x));
return x;
}
#elif defined (__aarch64__)
if (!__builtin_constant_p (x))
{
__asm__ ("rev %0, %0":"+r" (x));
return x;
}
#endif
#define _(x,n,i) \
((((x) >> (8*(i))) & 0xff) << (8*((n)-(i)-1)))
return (_(x, 8, 0) | _(x, 8, 1)
| _(x, 8, 2) | _(x, 8, 3)
| _(x, 8, 4) | _(x, 8, 5) | _(x, 8, 6) | _(x, 8, 7));
#undef _
return __builtin_bswap64 (x);
}
always_inline i64