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Re-enable aarch64 neon instruction in vlib_buffer_free_inline

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int vaddvq_u8 (uint8x16_t __a) is not appropriate to implement xxx_is_all_zero,
as there may be overflow causing incorrect return value.

Here's an example.
u8x16 x = {0 <repeats 12 times>, 1, 255, 0, 0};

Change-Id: Ia6a10bdf8da360dec12db902d028751a1a77e9a4
Signed-off-by: Lijian Zhang <Lijian.Zhang@arm.com>
Reviewed-by: Sirshak Das <Sirshak.Das@arm.com>
This commit is contained in:
Lijian.Zhang
2019-03-12 18:32:39 +08:00
committed by Damjan Marion
parent e225f71766
commit e6a47cf557
2 changed files with 12 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/vlib/buffer_funcs.h
View File

@ -712,7 +712,7 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
u8 buffer_pool_index = ~0;
u32 n_queue = 0, queue[queue_size + 4];
vlib_buffer_t bt = { };
#if defined(CLIB_HAVE_VEC128) && !__aarch64__
#if defined(CLIB_HAVE_VEC128)
vlib_buffer_t bpi_mask = {.buffer_pool_index = ~0 };
vlib_buffer_t bpi_vec = {.buffer_pool_index = ~0 };
vlib_buffer_t flags_refs_mask = {
@ -737,7 +737,7 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
vlib_prefetch_buffer_header (b[6], LOAD);
vlib_prefetch_buffer_header (b[7], LOAD);
#if defined(CLIB_HAVE_VEC128) && !__aarch64__
#if defined(CLIB_HAVE_VEC128)
u8x16 p0, p1, p2, p3, r;
p0 = u8x16_load_unaligned (b[0]);
p1 = u8x16_load_unaligned (b[1]);
@ -815,7 +815,7 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
}
buffer_pool_index = b[0]->buffer_pool_index;
#if defined(CLIB_HAVE_VEC128) && !__aarch64__
#if defined(CLIB_HAVE_VEC128)
bpi_vec.buffer_pool_index = buffer_pool_index;
#endif
bp = vlib_get_buffer_pool (vm, buffer_pool_index);

11
src/vppinfra/vector_neon.h
View File

@ -22,6 +22,13 @@
#define i16x8_sub_saturate(a,b) vsubq_s16(a,b)
/* Dummy. Aid making uniform macros */
#define vreinterpretq_u8_u8(a) a
/* Implement the missing intrinsics to make uniform macros */
#define vminvq_u64(x) \
({ \
u64 x0 = vgetq_lane_u64(x, 0); \
u64 x1 = vgetq_lane_u64(x, 1); \
x0 < x1 ? x0 : x1; \
})
/* Converts all ones/zeros compare mask to bitmap. */
always_inline u32
@ -62,11 +69,11 @@ t##s##x##c##_store_unaligned (t##s##x##c v, void *p) \
\
static_always_inline int \
t##s##x##c##_is_all_zero (t##s##x##c x) \
{ return !(vaddvq_##i (x)); } \
{ return !!(vminvq_u##s (vceqq_##i (vdupq_n_##i(0), x))); } \
\
static_always_inline int \
t##s##x##c##_is_equal (t##s##x##c a, t##s##x##c b) \
{ return t##s##x##c##_is_all_zero (a ^ b); } \
{ return !!(vminvq_u##s (vceqq_##i (a, b))); } \
\
static_always_inline int \
t##s##x##c##_is_all_equal (t##s##x##c v, t##s x) \