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authorDamjan Marion <damarion@cisco.com>2022-02-10 14:31:59 +0100
committerFlorin Coras <florin.coras@gmail.com>2022-02-10 15:45:56 +0000
commitbc0ef7aef5624fefdc5592f9a2c179993a78bfcc (patch)
treecccc70d53d601c6a3232fdd21d3829bf93783363
parente01ce5ad5d93c2239d0885d4b9486ba10447a529 (diff)
vppinfra: clib_memcpy_may_overrun
Faster memcpy variant when overrun of up to SIMD register size - 1 is accepable. Type: improvement Change-Id: I1fb22e2989f2156caa9f34fa096e6ff9ea9ec7b6 Signed-off-by: Damjan Marion <damarion@cisco.com>
-rw-r--r--src/vppinfra/memcpy.h43
1 files changed, 43 insertions, 0 deletions
diff --git a/src/vppinfra/memcpy.h b/src/vppinfra/memcpy.h
index f3adc78d53d..e895cbf7485 100644
--- a/src/vppinfra/memcpy.h
+++ b/src/vppinfra/memcpy.h
@@ -6,6 +6,49 @@
#ifndef included_memcpy_h
#define included_memcpy_h
+static_always_inline void
+clib_memcpy_may_overrun (void *dst, void *src, u32 n_bytes)
+{
+ word n_left = n_bytes;
+#if defined(CLIB_HAVE_VEC512)
+ u8x64u *sv = (u8x64u *) src;
+ u8x64u *dv = (u8x64u *) dst;
+#elif defined(CLIB_HAVE_VEC256)
+ u8x32u *sv = (u8x32u *) src;
+ u8x32u *dv = (u8x32u *) dst;
+#elif defined(CLIB_HAVE_VEC128)
+ u8x16u *sv = (u8x16u *) src;
+ u8x16u *dv = (u8x16u *) dst;
+#else
+ u64u *sv = (u64u *) src;
+ u64u *dv = (u64u *) dst;
+#endif
+
+ while (n_left >= 4 * sizeof (sv[0]))
+ {
+ __typeof__ (*sv) v0, v1, v2, v3;
+ v0 = sv[0];
+ v1 = sv[1];
+ v2 = sv[2];
+ v3 = sv[3];
+ sv += 4;
+ n_left -= 4 * sizeof (sv[0]);
+ dv[0] = v0;
+ dv[1] = v1;
+ dv[2] = v2;
+ dv[3] = v3;
+ dv += 4;
+ }
+
+ while (n_left > 0)
+ {
+ dv[0] = sv[0];
+ sv += 1;
+ dv += 1;
+ n_left -= sizeof (sv[0]);
+ }
+}
+
#ifndef __COVERITY__
static_always_inline void