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| author | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2023-02-01 18:45:19 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2024-04-08 16:46:36 +0100 |
| commit | f45608f6d74b95d0711c80c24b5eda07b60a7e50 (patch) | |
| tree | 64e7b843288f6bff0da29cdb128e6cb34ff75334 | |
| parent | 600098c58ab53107a76237cba8b90ce26b253b56 (diff) | |
| download | glibc-f45608f6d74b95d0711c80c24b5eda07b60a7e50.tar.gz glibc-f45608f6d74b95d0711c80c24b5eda07b60a7e50.tar.xz glibc-f45608f6d74b95d0711c80c24b5eda07b60a7e50.zip | |
AArch64: Improve SVE memcpy and memmove
Improve SVE memcpy by copying 2 vectors if the size is small enough. This improves performance of random memcpy by ~9% on Neoverse V1, and 33-64 byte copies are ~16% faster. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> (cherry picked from commit d2d3f3720ce627a4fe154d8dd14db716a32bcc6e)
| -rw-r--r-- | sysdeps/aarch64/multiarch/memcpy_sve.S | 34 |
1 files changed, 14 insertions, 20 deletions
diff --git a/sysdeps/aarch64/multiarch/memcpy_sve.S b/sysdeps/aarch64/multiarch/memcpy_sve.S index a70907ec55..6bc8390fe8 100644 --- a/sysdeps/aarch64/multiarch/memcpy_sve.S +++ b/sysdeps/aarch64/multiarch/memcpy_sve.S @@ -67,14 +67,15 @@ ENTRY (__memcpy_sve) cmp count, 128 b.hi L(copy_long) - cmp count, 32 + cntb vlen + cmp count, vlen, lsl 1 b.hi L(copy32_128) - whilelo p0.b, xzr, count - cntb vlen - tbnz vlen, 4, L(vlen128) - ld1b z0.b, p0/z, [src] - st1b z0.b, p0, [dstin] + whilelo p1.b, vlen, count + ld1b z0.b, p0/z, [src, 0, mul vl] + ld1b z1.b, p1/z, [src, 1, mul vl] + st1b z0.b, p0, [dstin, 0, mul vl] + st1b z1.b, p1, [dstin, 1, mul vl] ret /* Medium copies: 33..128 bytes. */ @@ -102,14 +103,6 @@ L(copy96): stp C_q, D_q, [dstend, -32] ret -L(vlen128): - whilelo p1.b, vlen, count - ld1b z0.b, p0/z, [src, 0, mul vl] - ld1b z1.b, p1/z, [src, 1, mul vl] - st1b z0.b, p0, [dstin, 0, mul vl] - st1b z1.b, p1, [dstin, 1, mul vl] - ret - .p2align 4 /* Copy more than 128 bytes. */ L(copy_long): @@ -158,14 +151,15 @@ ENTRY (__memmove_sve) cmp count, 128 b.hi L(move_long) - cmp count, 32 + cntb vlen + cmp count, vlen, lsl 1 b.hi L(copy32_128) - whilelo p0.b, xzr, count - cntb vlen - tbnz vlen, 4, L(vlen128) - ld1b z0.b, p0/z, [src] - st1b z0.b, p0, [dstin] + whilelo p1.b, vlen, count + ld1b z0.b, p0/z, [src, 0, mul vl] + ld1b z1.b, p1/z, [src, 1, mul vl] + st1b z0.b, p0, [dstin, 0, mul vl] + st1b z1.b, p1, [dstin, 1, mul vl] ret .p2align 4 |