mirror of
https://sourceware.org/git/glibc.git
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aarch64: Use memcpy_simd as the default memcpy
Since __memcpy_simd is the fastest memcpy on almost all cores, replace
the generic memcpy with it.
(cherry picked from commit 531717afbc)
This commit is contained in:
Wilco Dijkstra
Wilco Dijkstra
parent
47f69077d5
commit
f3095d3eb6
@ -1,4 +1,5 @@
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/* Copyright (C) 2012-2018 Free Software Foundation, Inc.
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/* Generic optimized memcpy using SIMD.
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Copyright (C) 2012-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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@ -20,7 +21,7 @@
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/* Assumptions:
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*
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* ARMv8-a, AArch64, unaligned accesses.
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* ARMv8-a, AArch64, Advanced SIMD, unaligned accesses.
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*
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*/
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@ -36,21 +37,18 @@
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#define B_l x8
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#define B_lw w8
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#define B_h x9
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#define C_l x10
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#define C_lw w10
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#define C_h x11
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#define D_l x12
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#define D_h x13
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#define E_l x14
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#define E_h x15
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#define F_l x16
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#define F_h x17
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#define G_l count
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#define G_h dst
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#define H_l src
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#define H_h srcend
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#define tmp1 x14
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#define A_q q0
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#define B_q q1
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#define C_q q2
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#define D_q q3
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#define E_q q4
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#define F_q q5
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#define G_q q6
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#define H_q q7
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#ifndef MEMMOVE
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# define MEMMOVE memmove
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#endif
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@ -69,8 +67,7 @@
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Large copies use a software pipelined loop processing 64 bytes per
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iteration. The destination pointer is 16-byte aligned to minimize
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unaligned accesses. The loop tail is handled by always copying 64 bytes
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from the end.
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*/
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from the end. */
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ENTRY_ALIGN (MEMCPY, 6)
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DELOUSE (0)
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@ -87,10 +84,10 @@ ENTRY_ALIGN (MEMCPY, 6)
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/* Small copies: 0..32 bytes. */
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cmp count, 16
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b.lo L(copy16)
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ldp A_l, A_h, [src]
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ldp D_l, D_h, [srcend, -16]
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stp A_l, A_h, [dstin]
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stp D_l, D_h, [dstend, -16]
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ldr A_q, [src]
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ldr B_q, [srcend, -16]
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str A_q, [dstin]
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str B_q, [dstend, -16]
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ret
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/* Copy 8-15 bytes. */
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@ -102,7 +99,6 @@ L(copy16):
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str A_h, [dstend, -8]
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ret
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.p2align 3
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/* Copy 4-7 bytes. */
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L(copy8):
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tbz count, 2, L(copy4)
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@ -128,81 +124,62 @@ L(copy0):
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.p2align 4
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/* Medium copies: 33..128 bytes. */
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L(copy32_128):
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ldp A_l, A_h, [src]
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ldp B_l, B_h, [src, 16]
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ldp C_l, C_h, [srcend, -32]
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ldp D_l, D_h, [srcend, -16]
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ldp A_q, B_q, [src]
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ldp C_q, D_q, [srcend, -32]
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cmp count, 64
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b.hi L(copy128)
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stp A_l, A_h, [dstin]
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stp B_l, B_h, [dstin, 16]
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stp C_l, C_h, [dstend, -32]
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stp D_l, D_h, [dstend, -16]
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stp A_q, B_q, [dstin]
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stp C_q, D_q, [dstend, -32]
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ret
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.p2align 4
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/* Copy 65..128 bytes. */
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L(copy128):
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ldp E_l, E_h, [src, 32]
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ldp F_l, F_h, [src, 48]
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ldp E_q, F_q, [src, 32]
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cmp count, 96
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b.ls L(copy96)
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ldp G_l, G_h, [srcend, -64]
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ldp H_l, H_h, [srcend, -48]
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stp G_l, G_h, [dstend, -64]
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stp H_l, H_h, [dstend, -48]
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ldp G_q, H_q, [srcend, -64]
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stp G_q, H_q, [dstend, -64]
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L(copy96):
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stp A_l, A_h, [dstin]
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stp B_l, B_h, [dstin, 16]
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stp E_l, E_h, [dstin, 32]
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stp F_l, F_h, [dstin, 48]
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stp C_l, C_h, [dstend, -32]
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stp D_l, D_h, [dstend, -16]
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stp A_q, B_q, [dstin]
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stp E_q, F_q, [dstin, 32]
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stp C_q, D_q, [dstend, -32]
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ret
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.p2align 4
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/* Align loop64 below to 16 bytes. */
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nop
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/* Copy more than 128 bytes. */
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L(copy_long):
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/* Copy 16 bytes and then align dst to 16-byte alignment. */
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ldp D_l, D_h, [src]
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and tmp1, dstin, 15
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bic dst, dstin, 15
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sub src, src, tmp1
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/* Copy 16 bytes and then align src to 16-byte alignment. */
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ldr D_q, [src]
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and tmp1, src, 15
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bic src, src, 15
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sub dst, dstin, tmp1
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add count, count, tmp1 /* Count is now 16 too large. */
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ldp A_l, A_h, [src, 16]
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stp D_l, D_h, [dstin]
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ldp B_l, B_h, [src, 32]
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ldp C_l, C_h, [src, 48]
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ldp D_l, D_h, [src, 64]!
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ldp A_q, B_q, [src, 16]
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str D_q, [dstin]
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ldp C_q, D_q, [src, 48]
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subs count, count, 128 + 16 /* Test and readjust count. */
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b.ls L(copy64_from_end)
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L(loop64):
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stp A_l, A_h, [dst, 16]
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ldp A_l, A_h, [src, 16]
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stp B_l, B_h, [dst, 32]
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ldp B_l, B_h, [src, 32]
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stp C_l, C_h, [dst, 48]
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ldp C_l, C_h, [src, 48]
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stp D_l, D_h, [dst, 64]!
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ldp D_l, D_h, [src, 64]!
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stp A_q, B_q, [dst, 16]
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ldp A_q, B_q, [src, 80]
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stp C_q, D_q, [dst, 48]
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ldp C_q, D_q, [src, 112]
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add src, src, 64
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add dst, dst, 64
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subs count, count, 64
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b.hi L(loop64)
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/* Write the last iteration and copy 64 bytes from the end. */
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L(copy64_from_end):
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ldp E_l, E_h, [srcend, -64]
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stp A_l, A_h, [dst, 16]
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ldp A_l, A_h, [srcend, -48]
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stp B_l, B_h, [dst, 32]
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ldp B_l, B_h, [srcend, -32]
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stp C_l, C_h, [dst, 48]
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ldp C_l, C_h, [srcend, -16]
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stp D_l, D_h, [dst, 64]
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stp E_l, E_h, [dstend, -64]
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stp A_l, A_h, [dstend, -48]
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stp B_l, B_h, [dstend, -32]
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stp C_l, C_h, [dstend, -16]
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ldp E_q, F_q, [srcend, -64]
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stp A_q, B_q, [dst, 16]
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ldp A_q, B_q, [srcend, -32]
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stp C_q, D_q, [dst, 48]
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stp E_q, F_q, [dstend, -64]
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stp A_q, B_q, [dstend, -32]
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ret
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END (MEMCPY)
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@ -220,64 +197,56 @@ ENTRY_ALIGN (MEMMOVE, 4)
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cmp count, 32
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b.hi L(copy32_128)
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/* Small copies: 0..32 bytes. */
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/* Small moves: 0..32 bytes. */
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cmp count, 16
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b.lo L(copy16)
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ldp A_l, A_h, [src]
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ldp D_l, D_h, [srcend, -16]
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stp A_l, A_h, [dstin]
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stp D_l, D_h, [dstend, -16]
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ldr A_q, [src]
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ldr B_q, [srcend, -16]
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str A_q, [dstin]
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str B_q, [dstend, -16]
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ret
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.p2align 4
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L(move_long):
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/* Only use backward copy if there is an overlap. */
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sub tmp1, dstin, src
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cbz tmp1, L(copy0)
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cbz tmp1, L(move0)
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cmp tmp1, count
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b.hs L(copy_long)
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/* Large backwards copy for overlapping copies.
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Copy 16 bytes and then align dst to 16-byte alignment. */
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ldp D_l, D_h, [srcend, -16]
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and tmp1, dstend, 15
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sub srcend, srcend, tmp1
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Copy 16 bytes and then align srcend to 16-byte alignment. */
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L(copy_long_backwards):
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ldr D_q, [srcend, -16]
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and tmp1, srcend, 15
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bic srcend, srcend, 15
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sub count, count, tmp1
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ldp A_l, A_h, [srcend, -16]
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stp D_l, D_h, [dstend, -16]
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ldp B_l, B_h, [srcend, -32]
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ldp C_l, C_h, [srcend, -48]
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ldp D_l, D_h, [srcend, -64]!
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ldp A_q, B_q, [srcend, -32]
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str D_q, [dstend, -16]
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ldp C_q, D_q, [srcend, -64]
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sub dstend, dstend, tmp1
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subs count, count, 128
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b.ls L(copy64_from_start)
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L(loop64_backwards):
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stp A_l, A_h, [dstend, -16]
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ldp A_l, A_h, [srcend, -16]
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stp B_l, B_h, [dstend, -32]
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ldp B_l, B_h, [srcend, -32]
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stp C_l, C_h, [dstend, -48]
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ldp C_l, C_h, [srcend, -48]
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stp D_l, D_h, [dstend, -64]!
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ldp D_l, D_h, [srcend, -64]!
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str B_q, [dstend, -16]
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str A_q, [dstend, -32]
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ldp A_q, B_q, [srcend, -96]
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str D_q, [dstend, -48]
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str C_q, [dstend, -64]!
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ldp C_q, D_q, [srcend, -128]
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sub srcend, srcend, 64
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subs count, count, 64
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b.hi L(loop64_backwards)
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/* Write the last iteration and copy 64 bytes from the start. */
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L(copy64_from_start):
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ldp G_l, G_h, [src, 48]
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stp A_l, A_h, [dstend, -16]
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ldp A_l, A_h, [src, 32]
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stp B_l, B_h, [dstend, -32]
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ldp B_l, B_h, [src, 16]
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stp C_l, C_h, [dstend, -48]
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ldp C_l, C_h, [src]
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stp D_l, D_h, [dstend, -64]
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stp G_l, G_h, [dstin, 48]
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stp A_l, A_h, [dstin, 32]
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stp B_l, B_h, [dstin, 16]
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stp C_l, C_h, [dstin]
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ldp E_q, F_q, [src, 32]
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stp A_q, B_q, [dstend, -32]
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ldp A_q, B_q, [src]
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stp C_q, D_q, [dstend, -64]
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stp E_q, F_q, [dstin, 32]
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stp A_q, B_q, [dstin]
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L(move0):
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ret
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END (MEMMOVE)
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@ -1,4 +1,4 @@
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ifeq ($(subdir),string)
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sysdep_routines += memcpy_generic memcpy_advsimd memcpy_thunderx memcpy_thunderx2 \
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sysdep_routines += memcpy_generic memcpy_thunderx memcpy_thunderx2 \
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memcpy_falkor memmove_falkor memset_generic memset_falkor
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endif
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@ -42,12 +42,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_thunderx)
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IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_thunderx2)
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IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_falkor)
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IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_simd)
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IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_generic))
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IFUNC_IMPL (i, name, memmove,
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IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_thunderx)
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IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_falkor)
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IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_simd)
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IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_generic))
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IFUNC_IMPL (i, name, memset,
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/* Enable this on non-falkor processors too so that other cores
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@ -29,7 +29,6 @@
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extern __typeof (__redirect_memcpy) __libc_memcpy;
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extern __typeof (__redirect_memcpy) __memcpy_generic attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_simd attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_thunderx attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_thunderx2 attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_falkor attribute_hidden;
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@ -41,10 +40,7 @@ libc_ifunc (__libc_memcpy,
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? __memcpy_falkor
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: (IS_THUNDERX2 (midr) || IS_THUNDERX2PA (midr)
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? __memcpy_thunderx2
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: (IS_NEOVERSE_N1 (midr) || IS_NEOVERSE_N2 (midr)
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|| IS_NEOVERSE_V1 (midr)
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? __memcpy_simd
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: __memcpy_generic)))));
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: __memcpy_generic))));
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# undef memcpy
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strong_alias (__libc_memcpy, memcpy);
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@ -1,248 +0,0 @@
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/* Generic optimized memcpy using SIMD.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* Assumptions:
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*
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* ARMv8-a, AArch64, Advanced SIMD, unaligned accesses.
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*
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*/
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#define dstin x0
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#define src x1
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#define count x2
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#define dst x3
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#define srcend x4
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#define dstend x5
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#define A_l x6
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#define A_lw w6
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#define A_h x7
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#define B_l x8
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#define B_lw w8
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#define B_h x9
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#define C_lw w10
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#define tmp1 x14
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#define A_q q0
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#define B_q q1
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#define C_q q2
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#define D_q q3
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#define E_q q4
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#define F_q q5
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#define G_q q6
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#define H_q q7
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/* This implementation supports both memcpy and memmove and shares most code.
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It uses unaligned accesses and branchless sequences to keep the code small,
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simple and improve performance.
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Copies are split into 3 main cases: small copies of up to 32 bytes, medium
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copies of up to 128 bytes, and large copies. The overhead of the overlap
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check in memmove is negligible since it is only required for large copies.
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Large copies use a software pipelined loop processing 64 bytes per
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iteration. The destination pointer is 16-byte aligned to minimize
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unaligned accesses. The loop tail is handled by always copying 64 bytes
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from the end. */
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ENTRY (__memcpy_simd)
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DELOUSE (0)
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DELOUSE (1)
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DELOUSE (2)
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add srcend, src, count
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add dstend, dstin, count
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cmp count, 128
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b.hi L(copy_long)
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cmp count, 32
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b.hi L(copy32_128)
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/* Small copies: 0..32 bytes. */
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cmp count, 16
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b.lo L(copy16)
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ldr A_q, [src]
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ldr B_q, [srcend, -16]
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str A_q, [dstin]
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str B_q, [dstend, -16]
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ret
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/* Copy 8-15 bytes. */
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L(copy16):
|
||||
tbz count, 3, L(copy8)
|
||||
ldr A_l, [src]
|
||||
ldr A_h, [srcend, -8]
|
||||
str A_l, [dstin]
|
||||
str A_h, [dstend, -8]
|
||||
ret
|
||||
|
||||
/* Copy 4-7 bytes. */
|
||||
L(copy8):
|
||||
tbz count, 2, L(copy4)
|
||||
ldr A_lw, [src]
|
||||
ldr B_lw, [srcend, -4]
|
||||
str A_lw, [dstin]
|
||||
str B_lw, [dstend, -4]
|
||||
ret
|
||||
|
||||
/* Copy 0..3 bytes using a branchless sequence. */
|
||||
L(copy4):
|
||||
cbz count, L(copy0)
|
||||
lsr tmp1, count, 1
|
||||
ldrb A_lw, [src]
|
||||
ldrb C_lw, [srcend, -1]
|
||||
ldrb B_lw, [src, tmp1]
|
||||
strb A_lw, [dstin]
|
||||
strb B_lw, [dstin, tmp1]
|
||||
strb C_lw, [dstend, -1]
|
||||
L(copy0):
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
/* Medium copies: 33..128 bytes. */
|
||||
L(copy32_128):
|
||||
ldp A_q, B_q, [src]
|
||||
ldp C_q, D_q, [srcend, -32]
|
||||
cmp count, 64
|
||||
b.hi L(copy128)
|
||||
stp A_q, B_q, [dstin]
|
||||
stp C_q, D_q, [dstend, -32]
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
/* Copy 65..128 bytes. */
|
||||
L(copy128):
|
||||
ldp E_q, F_q, [src, 32]
|
||||
cmp count, 96
|
||||
b.ls L(copy96)
|
||||
ldp G_q, H_q, [srcend, -64]
|
||||
stp G_q, H_q, [dstend, -64]
|
||||
L(copy96):
|
||||
stp A_q, B_q, [dstin]
|
||||
stp E_q, F_q, [dstin, 32]
|
||||
stp C_q, D_q, [dstend, -32]
|
||||
ret
|
||||
|
||||
/* Align loop64 below to 16 bytes. */
|
||||
nop
|
||||
|
||||
/* Copy more than 128 bytes. */
|
||||
L(copy_long):
|
||||
/* Copy 16 bytes and then align src to 16-byte alignment. */
|
||||
ldr D_q, [src]
|
||||
and tmp1, src, 15
|
||||
bic src, src, 15
|
||||
sub dst, dstin, tmp1
|
||||
add count, count, tmp1 /* Count is now 16 too large. */
|
||||
ldp A_q, B_q, [src, 16]
|
||||
str D_q, [dstin]
|
||||
ldp C_q, D_q, [src, 48]
|
||||
subs count, count, 128 + 16 /* Test and readjust count. */
|
||||
b.ls L(copy64_from_end)
|
||||
L(loop64):
|
||||
stp A_q, B_q, [dst, 16]
|
||||
ldp A_q, B_q, [src, 80]
|
||||
stp C_q, D_q, [dst, 48]
|
||||
ldp C_q, D_q, [src, 112]
|
||||
add src, src, 64
|
||||
add dst, dst, 64
|
||||
subs count, count, 64
|
||||
b.hi L(loop64)
|
||||
|
||||
/* Write the last iteration and copy 64 bytes from the end. */
|
||||
L(copy64_from_end):
|
||||
ldp E_q, F_q, [srcend, -64]
|
||||
stp A_q, B_q, [dst, 16]
|
||||
ldp A_q, B_q, [srcend, -32]
|
||||
stp C_q, D_q, [dst, 48]
|
||||
stp E_q, F_q, [dstend, -64]
|
||||
stp A_q, B_q, [dstend, -32]
|
||||
ret
|
||||
|
||||
END (__memcpy_simd)
|
||||
libc_hidden_builtin_def (__memcpy_simd)
|
||||
|
||||
|
||||
ENTRY (__memmove_simd)
|
||||
DELOUSE (0)
|
||||
DELOUSE (1)
|
||||
DELOUSE (2)
|
||||
|
||||
add srcend, src, count
|
||||
add dstend, dstin, count
|
||||
cmp count, 128
|
||||
b.hi L(move_long)
|
||||
cmp count, 32
|
||||
b.hi L(copy32_128)
|
||||
|
||||
/* Small moves: 0..32 bytes. */
|
||||
cmp count, 16
|
||||
b.lo L(copy16)
|
||||
ldr A_q, [src]
|
||||
ldr B_q, [srcend, -16]
|
||||
str A_q, [dstin]
|
||||
str B_q, [dstend, -16]
|
||||
ret
|
||||
|
||||
L(move_long):
|
||||
/* Only use backward copy if there is an overlap. */
|
||||
sub tmp1, dstin, src
|
||||
cbz tmp1, L(move0)
|
||||
cmp tmp1, count
|
||||
b.hs L(copy_long)
|
||||
|
||||
/* Large backwards copy for overlapping copies.
|
||||
Copy 16 bytes and then align srcend to 16-byte alignment. */
|
||||
L(copy_long_backwards):
|
||||
ldr D_q, [srcend, -16]
|
||||
and tmp1, srcend, 15
|
||||
bic srcend, srcend, 15
|
||||
sub count, count, tmp1
|
||||
ldp A_q, B_q, [srcend, -32]
|
||||
str D_q, [dstend, -16]
|
||||
ldp C_q, D_q, [srcend, -64]
|
||||
sub dstend, dstend, tmp1
|
||||
subs count, count, 128
|
||||
b.ls L(copy64_from_start)
|
||||
|
||||
L(loop64_backwards):
|
||||
str B_q, [dstend, -16]
|
||||
str A_q, [dstend, -32]
|
||||
ldp A_q, B_q, [srcend, -96]
|
||||
str D_q, [dstend, -48]
|
||||
str C_q, [dstend, -64]!
|
||||
ldp C_q, D_q, [srcend, -128]
|
||||
sub srcend, srcend, 64
|
||||
subs count, count, 64
|
||||
b.hi L(loop64_backwards)
|
||||
|
||||
/* Write the last iteration and copy 64 bytes from the start. */
|
||||
L(copy64_from_start):
|
||||
ldp E_q, F_q, [src, 32]
|
||||
stp A_q, B_q, [dstend, -32]
|
||||
ldp A_q, B_q, [src]
|
||||
stp C_q, D_q, [dstend, -64]
|
||||
stp E_q, F_q, [dstin, 32]
|
||||
stp A_q, B_q, [dstin]
|
||||
L(move0):
|
||||
ret
|
||||
|
||||
END (__memmove_simd)
|
||||
libc_hidden_builtin_def (__memmove_simd)
|
||||
@ -29,7 +29,6 @@
|
||||
extern __typeof (__redirect_memmove) __libc_memmove;
|
||||
|
||||
extern __typeof (__redirect_memmove) __memmove_generic attribute_hidden;
|
||||
extern __typeof (__redirect_memmove) __memmove_simd attribute_hidden;
|
||||
extern __typeof (__redirect_memmove) __memmove_thunderx attribute_hidden;
|
||||
extern __typeof (__redirect_memmove) __memmove_falkor attribute_hidden;
|
||||
|
||||
@ -38,10 +37,7 @@ libc_ifunc (__libc_memmove,
|
||||
? __memmove_thunderx
|
||||
: (IS_FALKOR (midr) || IS_PHECDA (midr)
|
||||
? __memmove_falkor
|
||||
: (IS_NEOVERSE_N1 (midr) || IS_NEOVERSE_N2 (midr)
|
||||
|| IS_NEOVERSE_V1 (midr)
|
||||
? __memmove_simd
|
||||
: __memmove_generic))));
|
||||
: __memmove_generic)));
|
||||
|
||||
# undef memmove
|
||||
strong_alias (__libc_memmove, memmove);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user