mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-22 20:31:14 +00:00
memset: use neon-less impl, reformat other asm
This commit is contained in:
Michael Scire
parent
e42d3a3abf
commit
6c52cc3e26
4 changed files with 401 additions and 358 deletions
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@ -8,22 +8,22 @@
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#ifndef _ASMDEFS_H
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#define _ASMDEFS_H
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#define ENTRY_ALIGN(name, alignment) \
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.global name; \
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.type name,%function; \
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.align alignment; \
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name: \
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#define ENTRY_ALIGN(name, alignment) \
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.global name; \
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.type name,%function; \
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.align alignment; \
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name: \
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.cfi_startproc;
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#define ENTRY(name) ENTRY_ALIGN(name, 6)
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#define ENTRY(name) ENTRY_ALIGN(name, 6)
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#define ENTRY_ALIAS(name) \
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.global name; \
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.type name,%function; \
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#define ENTRY_ALIAS(name) \
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.global name; \
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.type name,%function; \
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name:
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#define END(name) \
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.cfi_endproc; \
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#define END(name) \
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.cfi_endproc; \
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.size name, .-name;
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#define L(l) .L ## l
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@ -12,122 +12,122 @@
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#include "asmdefs.h"
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/* Parameters and result. */
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#define src1 x0
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#define src2 x1
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#define limit x2
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#define result w0
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#define src1 x0
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#define src2 x1
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#define limit x2
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#define result w0
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/* Internal variables. */
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#define data1 x3
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#define data1w w3
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#define data1h x4
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#define data2 x5
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#define data2w w5
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#define data2h x6
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#define tmp1 x7
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#define tmp2 x8
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#define data1 x3
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#define data1w w3
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#define data1h x4
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#define data2 x5
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#define data2w w5
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#define data2h x6
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#define tmp1 x7
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#define tmp2 x8
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ENTRY (memcmp)
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subs limit, limit, 8
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b.lo L(less8)
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subs limit, limit, 8
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b.lo L(less8)
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ldr data1, [src1], 8
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ldr data2, [src2], 8
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cmp data1, data2
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b.ne L(return)
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ldr data1, [src1], 8
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ldr data2, [src2], 8
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cmp data1, data2
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b.ne L(return)
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subs limit, limit, 8
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b.gt L(more16)
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subs limit, limit, 8
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b.gt L(more16)
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ldr data1, [src1, limit]
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ldr data2, [src2, limit]
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b L(return)
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ldr data1, [src1, limit]
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ldr data2, [src2, limit]
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b L(return)
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L(more16):
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ldr data1, [src1], 8
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ldr data2, [src2], 8
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cmp data1, data2
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bne L(return)
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ldr data1, [src1], 8
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ldr data2, [src2], 8
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cmp data1, data2
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bne L(return)
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/* Jump directly to comparing the last 16 bytes for 32 byte (or less)
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strings. */
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subs limit, limit, 16
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b.ls L(last_bytes)
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/* Jump directly to comparing the last 16 bytes for 32 byte (or less)
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strings. */
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subs limit, limit, 16
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b.ls L(last_bytes)
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/* We overlap loads between 0-32 bytes at either side of SRC1 when we
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try to align, so limit it only to strings larger than 128 bytes. */
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cmp limit, 96
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b.ls L(loop16)
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/* We overlap loads between 0-32 bytes at either side of SRC1 when we
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try to align, so limit it only to strings larger than 128 bytes. */
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cmp limit, 96
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b.ls L(loop16)
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/* Align src1 and adjust src2 with bytes not yet done. */
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and tmp1, src1, 15
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add limit, limit, tmp1
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sub src1, src1, tmp1
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sub src2, src2, tmp1
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/* Align src1 and adjust src2 with bytes not yet done. */
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and tmp1, src1, 15
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add limit, limit, tmp1
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sub src1, src1, tmp1
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sub src2, src2, tmp1
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/* Loop performing 16 bytes per iteration using aligned src1.
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Limit is pre-decremented by 16 and must be larger than zero.
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Exit if <= 16 bytes left to do or if the data is not equal. */
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.p2align 4
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/* Loop performing 16 bytes per iteration using aligned src1.
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Limit is pre-decremented by 16 and must be larger than zero.
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Exit if <= 16 bytes left to do or if the data is not equal. */
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.p2align 4
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L(loop16):
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ldp data1, data1h, [src1], 16
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ldp data2, data2h, [src2], 16
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subs limit, limit, 16
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ccmp data1, data2, 0, hi
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ccmp data1h, data2h, 0, eq
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b.eq L(loop16)
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ldp data1, data1h, [src1], 16
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ldp data2, data2h, [src2], 16
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subs limit, limit, 16
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ccmp data1, data2, 0, hi
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ccmp data1h, data2h, 0, eq
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b.eq L(loop16)
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cmp data1, data2
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bne L(return)
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mov data1, data1h
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mov data2, data2h
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cmp data1, data2
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bne L(return)
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cmp data1, data2
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bne L(return)
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mov data1, data1h
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mov data2, data2h
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cmp data1, data2
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bne L(return)
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/* Compare last 1-16 bytes using unaligned access. */
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/* Compare last 1-16 bytes using unaligned access. */
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L(last_bytes):
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add src1, src1, limit
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add src2, src2, limit
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ldp data1, data1h, [src1]
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ldp data2, data2h, [src2]
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cmp data1, data2
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bne L(return)
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mov data1, data1h
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mov data2, data2h
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cmp data1, data2
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add src1, src1, limit
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add src2, src2, limit
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ldp data1, data1h, [src1]
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ldp data2, data2h, [src2]
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cmp data1, data2
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bne L(return)
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mov data1, data1h
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mov data2, data2h
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cmp data1, data2
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/* Compare data bytes and set return value to 0, -1 or 1. */
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/* Compare data bytes and set return value to 0, -1 or 1. */
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L(return):
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#ifndef __AARCH64EB__
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rev data1, data1
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rev data2, data2
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rev data1, data1
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rev data2, data2
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#endif
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cmp data1, data2
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cmp data1, data2
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L(ret_eq):
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cset result, ne
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cneg result, result, lo
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ret
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cset result, ne
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cneg result, result, lo
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ret
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.p2align 4
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/* Compare up to 8 bytes. Limit is [-8..-1]. */
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.p2align 4
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/* Compare up to 8 bytes. Limit is [-8..-1]. */
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L(less8):
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adds limit, limit, 4
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b.lo L(less4)
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ldr data1w, [src1], 4
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ldr data2w, [src2], 4
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cmp data1w, data2w
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b.ne L(return)
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sub limit, limit, 4
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adds limit, limit, 4
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b.lo L(less4)
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ldr data1w, [src1], 4
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ldr data2w, [src2], 4
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cmp data1w, data2w
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b.ne L(return)
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sub limit, limit, 4
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L(less4):
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adds limit, limit, 4
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beq L(ret_eq)
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adds limit, limit, 4
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beq L(ret_eq)
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L(byte_loop):
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ldrb data1w, [src1], 1
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ldrb data2w, [src2], 1
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subs limit, limit, 1
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ccmp data1w, data2w, 0, ne /* NZCV = 0b0000. */
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b.eq L(byte_loop)
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sub result, data1w, data2w
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ret
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ldrb data1w, [src1], 1
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ldrb data2w, [src2], 1
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subs limit, limit, 1
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ccmp data1w, data2w, 0, ne /* NZCV = 0b0000. */
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b.eq L(byte_loop)
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sub result, data1w, data2w
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ret
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END (memcmp)
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@ -13,32 +13,32 @@
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#include "asmdefs.h"
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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_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 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_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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/* This implementation handles overlaps and supports both memcpy and memmove
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from a single entry point. It uses unaligned accesses and branchless
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@ -55,185 +55,185 @@
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ENTRY (memcpy)
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ENTRY_ALIAS (memmove)
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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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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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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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ret
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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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ret
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/* Copy 8-15 bytes. */
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/* Copy 8-15 bytes. */
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L(copy16):
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tbz count, 3, L(copy8)
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ldr A_l, [src]
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ldr A_h, [srcend, -8]
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str A_l, [dstin]
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str A_h, [dstend, -8]
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ret
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tbz count, 3, L(copy8)
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ldr A_l, [src]
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ldr A_h, [srcend, -8]
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str A_l, [dstin]
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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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.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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ldr A_lw, [src]
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ldr B_lw, [srcend, -4]
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str A_lw, [dstin]
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str B_lw, [dstend, -4]
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ret
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tbz count, 2, L(copy4)
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ldr A_lw, [src]
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ldr B_lw, [srcend, -4]
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str A_lw, [dstin]
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str B_lw, [dstend, -4]
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ret
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/* Copy 0..3 bytes using a branchless sequence. */
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/* Copy 0..3 bytes using a branchless sequence. */
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L(copy4):
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cbz count, L(copy0)
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lsr tmp1, count, 1
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ldrb A_lw, [src]
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ldrb C_lw, [srcend, -1]
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ldrb B_lw, [src, tmp1]
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strb A_lw, [dstin]
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strb B_lw, [dstin, tmp1]
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strb C_lw, [dstend, -1]
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cbz count, L(copy0)
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lsr tmp1, count, 1
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ldrb A_lw, [src]
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ldrb C_lw, [srcend, -1]
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ldrb B_lw, [src, tmp1]
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strb A_lw, [dstin]
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strb B_lw, [dstin, tmp1]
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strb C_lw, [dstend, -1]
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L(copy0):
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ret
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ret
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.p2align 4
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/* Medium copies: 33..128 bytes. */
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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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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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ret
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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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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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ret
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.p2align 4
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/* Copy 65..128 bytes. */
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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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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 E_l, E_h, [src, 32]
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ldp F_l, F_h, [src, 48]
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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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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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ret
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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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ret
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.p2align 4
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/* Copy more than 128 bytes. */
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.p2align 4
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/* Copy more than 128 bytes. */
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L(copy_long):
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/* Use backwards copy if there is an overlap. */
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sub tmp1, dstin, src
|
||||
cbz tmp1, L(copy0)
|
||||
cmp tmp1, count
|
||||
b.lo L(copy_long_backwards)
|
||||
/* Use backwards copy if there is an overlap. */
|
||||
sub tmp1, dstin, src
|
||||
cbz tmp1, L(copy0)
|
||||
cmp tmp1, count
|
||||
b.lo L(copy_long_backwards)
|
||||
|
||||
/* Copy 16 bytes and then align dst to 16-byte alignment. */
|
||||
/* Copy 16 bytes and then align dst to 16-byte alignment. */
|
||||
|
||||
ldp D_l, D_h, [src]
|
||||
and tmp1, dstin, 15
|
||||
bic dst, dstin, 15
|
||||
sub src, src, tmp1
|
||||
add count, count, tmp1 /* Count is now 16 too large. */
|
||||
ldp A_l, A_h, [src, 16]
|
||||
stp D_l, D_h, [dstin]
|
||||
ldp B_l, B_h, [src, 32]
|
||||
ldp C_l, C_h, [src, 48]
|
||||
ldp D_l, D_h, [src, 64]!
|
||||
subs count, count, 128 + 16 /* Test and readjust count. */
|
||||
b.ls L(copy64_from_end)
|
||||
ldp D_l, D_h, [src]
|
||||
and tmp1, dstin, 15
|
||||
bic dst, dstin, 15
|
||||
sub src, src, tmp1
|
||||
add count, count, tmp1 /* Count is now 16 too large. */
|
||||
ldp A_l, A_h, [src, 16]
|
||||
stp D_l, D_h, [dstin]
|
||||
ldp B_l, B_h, [src, 32]
|
||||
ldp C_l, C_h, [src, 48]
|
||||
ldp D_l, D_h, [src, 64]!
|
||||
subs count, count, 128 + 16 /* Test and readjust count. */
|
||||
b.ls L(copy64_from_end)
|
||||
|
||||
L(loop64):
|
||||
stp A_l, A_h, [dst, 16]
|
||||
ldp A_l, A_h, [src, 16]
|
||||
stp B_l, B_h, [dst, 32]
|
||||
ldp B_l, B_h, [src, 32]
|
||||
stp C_l, C_h, [dst, 48]
|
||||
ldp C_l, C_h, [src, 48]
|
||||
stp D_l, D_h, [dst, 64]!
|
||||
ldp D_l, D_h, [src, 64]!
|
||||
subs count, count, 64
|
||||
b.hi L(loop64)
|
||||
stp A_l, A_h, [dst, 16]
|
||||
ldp A_l, A_h, [src, 16]
|
||||
stp B_l, B_h, [dst, 32]
|
||||
ldp B_l, B_h, [src, 32]
|
||||
stp C_l, C_h, [dst, 48]
|
||||
ldp C_l, C_h, [src, 48]
|
||||
stp D_l, D_h, [dst, 64]!
|
||||
ldp D_l, D_h, [src, 64]!
|
||||
subs count, count, 64
|
||||
b.hi L(loop64)
|
||||
|
||||
/* Write the last iteration and copy 64 bytes from the end. */
|
||||
/* Write the last iteration and copy 64 bytes from the end. */
|
||||
L(copy64_from_end):
|
||||
ldp E_l, E_h, [srcend, -64]
|
||||
stp A_l, A_h, [dst, 16]
|
||||
ldp A_l, A_h, [srcend, -48]
|
||||
stp B_l, B_h, [dst, 32]
|
||||
ldp B_l, B_h, [srcend, -32]
|
||||
stp C_l, C_h, [dst, 48]
|
||||
ldp C_l, C_h, [srcend, -16]
|
||||
stp D_l, D_h, [dst, 64]
|
||||
stp E_l, E_h, [dstend, -64]
|
||||
stp A_l, A_h, [dstend, -48]
|
||||
stp B_l, B_h, [dstend, -32]
|
||||
stp C_l, C_h, [dstend, -16]
|
||||
ret
|
||||
ldp E_l, E_h, [srcend, -64]
|
||||
stp A_l, A_h, [dst, 16]
|
||||
ldp A_l, A_h, [srcend, -48]
|
||||
stp B_l, B_h, [dst, 32]
|
||||
ldp B_l, B_h, [srcend, -32]
|
||||
stp C_l, C_h, [dst, 48]
|
||||
ldp C_l, C_h, [srcend, -16]
|
||||
stp D_l, D_h, [dst, 64]
|
||||
stp E_l, E_h, [dstend, -64]
|
||||
stp A_l, A_h, [dstend, -48]
|
||||
stp B_l, B_h, [dstend, -32]
|
||||
stp C_l, C_h, [dstend, -16]
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
.p2align 4
|
||||
|
||||
/* Large backwards copy for overlapping copies.
|
||||
Copy 16 bytes and then align dst to 16-byte alignment. */
|
||||
/* Large backwards copy for overlapping copies.
|
||||
Copy 16 bytes and then align dst to 16-byte alignment. */
|
||||
L(copy_long_backwards):
|
||||
ldp D_l, D_h, [srcend, -16]
|
||||
and tmp1, dstend, 15
|
||||
sub srcend, srcend, tmp1
|
||||
sub count, count, tmp1
|
||||
ldp A_l, A_h, [srcend, -16]
|
||||
stp D_l, D_h, [dstend, -16]
|
||||
ldp B_l, B_h, [srcend, -32]
|
||||
ldp C_l, C_h, [srcend, -48]
|
||||
ldp D_l, D_h, [srcend, -64]!
|
||||
sub dstend, dstend, tmp1
|
||||
subs count, count, 128
|
||||
b.ls L(copy64_from_start)
|
||||
ldp D_l, D_h, [srcend, -16]
|
||||
and tmp1, dstend, 15
|
||||
sub srcend, srcend, tmp1
|
||||
sub count, count, tmp1
|
||||
ldp A_l, A_h, [srcend, -16]
|
||||
stp D_l, D_h, [dstend, -16]
|
||||
ldp B_l, B_h, [srcend, -32]
|
||||
ldp C_l, C_h, [srcend, -48]
|
||||
ldp D_l, D_h, [srcend, -64]!
|
||||
sub dstend, dstend, tmp1
|
||||
subs count, count, 128
|
||||
b.ls L(copy64_from_start)
|
||||
|
||||
L(loop64_backwards):
|
||||
stp A_l, A_h, [dstend, -16]
|
||||
ldp A_l, A_h, [srcend, -16]
|
||||
stp B_l, B_h, [dstend, -32]
|
||||
ldp B_l, B_h, [srcend, -32]
|
||||
stp C_l, C_h, [dstend, -48]
|
||||
ldp C_l, C_h, [srcend, -48]
|
||||
stp D_l, D_h, [dstend, -64]!
|
||||
ldp D_l, D_h, [srcend, -64]!
|
||||
subs count, count, 64
|
||||
b.hi L(loop64_backwards)
|
||||
stp A_l, A_h, [dstend, -16]
|
||||
ldp A_l, A_h, [srcend, -16]
|
||||
stp B_l, B_h, [dstend, -32]
|
||||
ldp B_l, B_h, [srcend, -32]
|
||||
stp C_l, C_h, [dstend, -48]
|
||||
ldp C_l, C_h, [srcend, -48]
|
||||
stp D_l, D_h, [dstend, -64]!
|
||||
ldp D_l, D_h, [srcend, -64]!
|
||||
subs count, count, 64
|
||||
b.hi L(loop64_backwards)
|
||||
|
||||
/* Write the last iteration and copy 64 bytes from the start. */
|
||||
/* Write the last iteration and copy 64 bytes from the start. */
|
||||
L(copy64_from_start):
|
||||
ldp G_l, G_h, [src, 48]
|
||||
stp A_l, A_h, [dstend, -16]
|
||||
ldp A_l, A_h, [src, 32]
|
||||
stp B_l, B_h, [dstend, -32]
|
||||
ldp B_l, B_h, [src, 16]
|
||||
stp C_l, C_h, [dstend, -48]
|
||||
ldp C_l, C_h, [src]
|
||||
stp D_l, D_h, [dstend, -64]
|
||||
stp G_l, G_h, [dstin, 48]
|
||||
stp A_l, A_h, [dstin, 32]
|
||||
stp B_l, B_h, [dstin, 16]
|
||||
stp C_l, C_h, [dstin]
|
||||
ret
|
||||
ldp G_l, G_h, [src, 48]
|
||||
stp A_l, A_h, [dstend, -16]
|
||||
ldp A_l, A_h, [src, 32]
|
||||
stp B_l, B_h, [dstend, -32]
|
||||
ldp B_l, B_h, [src, 16]
|
||||
stp C_l, C_h, [dstend, -48]
|
||||
ldp C_l, C_h, [src]
|
||||
stp D_l, D_h, [dstend, -64]
|
||||
stp G_l, G_h, [dstin, 48]
|
||||
stp A_l, A_h, [dstin, 32]
|
||||
stp B_l, B_h, [dstin, 16]
|
||||
stp C_l, C_h, [dstin]
|
||||
ret
|
||||
|
||||
END (memcpy)
|
||||
|
|
|
|||
|
|
@ -13,115 +13,158 @@
|
|||
|
||||
#include "asmdefs.h"
|
||||
|
||||
#define SAVE_FPU_REGISTERS
|
||||
#define SKIP_ZVA_CHECK
|
||||
|
||||
#ifdef SAVE_FPU_REGISTERS
|
||||
#define SAVE_Q0 str q0, [sp, #-16]!
|
||||
#define RESTORE_Q0 ldr q0, [sp], #16
|
||||
#else
|
||||
#define SAVE_Q0
|
||||
#define RESTORE_Q0
|
||||
#endif
|
||||
|
||||
#define RETURN RESTORE_Q0; ret; .p2align 4
|
||||
#define DC_ZVA_THRESHOLD 512
|
||||
|
||||
#define dstin x0
|
||||
#define val x1
|
||||
#define val x1
|
||||
#define valw w1
|
||||
#define count x2
|
||||
#define dst x3
|
||||
#define dst x3
|
||||
#define dstend x4
|
||||
#define zva_val x5
|
||||
|
||||
ENTRY (memset)
|
||||
SAVE_Q0
|
||||
|
||||
dup v0.16B, valw
|
||||
add dstend, dstin, count
|
||||
bfi valw, valw, 8, 8
|
||||
bfi valw, valw, 16, 16
|
||||
bfi val, val, 32, 32
|
||||
|
||||
cmp count, 96
|
||||
add dstend, dstin, count
|
||||
|
||||
cmp count, 96
|
||||
b.hi L(set_long)
|
||||
cmp count, 16
|
||||
cmp count, 16
|
||||
b.hs L(set_medium)
|
||||
mov val, v0.D[0]
|
||||
|
||||
/* Set 0..15 bytes. */
|
||||
tbz count, 3, 1f
|
||||
str val, [dstin]
|
||||
str val, [dstend, -8]
|
||||
RETURN
|
||||
1: tbz count, 2, 2f
|
||||
str valw, [dstin]
|
||||
str valw, [dstend, -4]
|
||||
RETURN
|
||||
2: cbz count, 3f
|
||||
tbz count, 3, 1f
|
||||
str val, [dstin]
|
||||
str val, [dstend, -8]
|
||||
ret
|
||||
1: tbz count, 2, 2f
|
||||
str valw, [dstin]
|
||||
str valw, [dstend, -4]
|
||||
ret
|
||||
2: cbz count, 3f
|
||||
strb valw, [dstin]
|
||||
tbz count, 1, 3f
|
||||
tbz count, 1, 3f
|
||||
strh valw, [dstend, -2]
|
||||
3: RETURN
|
||||
3: ret
|
||||
|
||||
/* Set 17..96 bytes. */
|
||||
/* Set 16..96 bytes. */
|
||||
.p2align 4
|
||||
L(set_medium):
|
||||
str q0, [dstin]
|
||||
stp val, val, [dstin]
|
||||
tbnz count, 6, L(set96)
|
||||
str q0, [dstend, -16]
|
||||
tbz count, 5, 1f
|
||||
str q0, [dstin, 16]
|
||||
str q0, [dstend, -32]
|
||||
1: RETURN
|
||||
stp val, val, [dstend, -16]
|
||||
tbz count, 5, 1f
|
||||
stp val, val, [dstin, 16]
|
||||
stp val, val, [dstend, -32]
|
||||
1: ret
|
||||
|
||||
.p2align 4
|
||||
/* Set 64..96 bytes. Write 64 bytes from the start and
|
||||
32 bytes from the end. */
|
||||
L(set96):
|
||||
str q0, [dstin, 16]
|
||||
stp q0, q0, [dstin, 32]
|
||||
stp q0, q0, [dstend, -32]
|
||||
RETURN
|
||||
stp val, val, [dstin, 16]
|
||||
stp val, val, [dstin, 32]
|
||||
stp val, val, [dstin, 48]
|
||||
stp val, val, [dstend, -32]
|
||||
stp val, val, [dstend, -16]
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(set_long):
|
||||
and valw, valw, 255
|
||||
bic dst, dstin, 15
|
||||
str q0, [dstin]
|
||||
cmp count, 160
|
||||
ccmp valw, 0, 0, hs
|
||||
b.ne L(no_zva)
|
||||
|
||||
#ifndef SKIP_ZVA_CHECK
|
||||
mrs zva_val, dczid_el0
|
||||
and zva_val, zva_val, 31
|
||||
cmp zva_val, 4 /* ZVA size is 64 bytes. */
|
||||
b.ne L(no_zva)
|
||||
stp val, val, [dstin]
|
||||
bic dst, dstin, 15
|
||||
#if DC_ZVA_THRESHOLD
|
||||
cmp count, DC_ZVA_THRESHOLD
|
||||
ccmp val, 0, 0, cs
|
||||
b.eq L(zva_64)
|
||||
#endif
|
||||
str q0, [dst, 16]
|
||||
stp q0, q0, [dst, 32]
|
||||
bic dst, dst, 63
|
||||
sub count, dstend, dst /* Count is now 64 too large. */
|
||||
sub count, count, 128 /* Adjust count and bias for loop. */
|
||||
/* Small-size or non-zero memset does not use DC ZVA. */
|
||||
sub count, dstend, dst
|
||||
|
||||
/*
|
||||
* Adjust count and bias for loop. By substracting extra 1 from count,
|
||||
* it is easy to use tbz instruction to check whether loop tailing
|
||||
* count is less than 33 bytes, so as to bypass 2 unneccesary stps.
|
||||
*/
|
||||
sub count, count, 64+16+1
|
||||
|
||||
#if DC_ZVA_THRESHOLD
|
||||
/* Align loop on 16-byte boundary, this might be friendly to i-cache. */
|
||||
nop
|
||||
#endif
|
||||
|
||||
1: stp val, val, [dst, 16]
|
||||
stp val, val, [dst, 32]
|
||||
stp val, val, [dst, 48]
|
||||
stp val, val, [dst, 64]!
|
||||
subs count, count, 64
|
||||
b.hs 1b
|
||||
|
||||
tbz count, 5, 1f /* Remaining count is less than 33 bytes? */
|
||||
stp val, val, [dst, 16]
|
||||
stp val, val, [dst, 32]
|
||||
1: stp val, val, [dstend, -32]
|
||||
stp val, val, [dstend, -16]
|
||||
ret
|
||||
|
||||
#if DC_ZVA_THRESHOLD
|
||||
.p2align 4
|
||||
L(zva_loop):
|
||||
add dst, dst, 64
|
||||
dc zva, dst
|
||||
subs count, count, 64
|
||||
b.hi L(zva_loop)
|
||||
stp q0, q0, [dstend, -64]
|
||||
stp q0, q0, [dstend, -32]
|
||||
RETURN
|
||||
L(zva_64):
|
||||
stp val, val, [dst, 16]
|
||||
stp val, val, [dst, 32]
|
||||
stp val, val, [dst, 48]
|
||||
bic dst, dst, 63
|
||||
|
||||
L(no_zva):
|
||||
sub count, dstend, dst /* Count is 16 too large. */
|
||||
sub dst, dst, 16 /* Dst is biased by -32. */
|
||||
sub count, count, 64 + 16 /* Adjust count and bias for loop. */
|
||||
L(no_zva_loop):
|
||||
stp q0, q0, [dst, 32]
|
||||
stp q0, q0, [dst, 64]!
|
||||
/*
|
||||
* Previous memory writes might cross cache line boundary, and cause
|
||||
* cache line partially dirty. Zeroing this kind of cache line using
|
||||
* DC ZVA will incur extra cost, for it requires loading untouched
|
||||
* part of the line from memory before zeoring.
|
||||
*
|
||||
* So, write the first 64 byte aligned block using stp to force
|
||||
* fully dirty cache line.
|
||||
*/
|
||||
stp val, val, [dst, 64]
|
||||
stp val, val, [dst, 80]
|
||||
stp val, val, [dst, 96]
|
||||
stp val, val, [dst, 112]
|
||||
|
||||
sub count, dstend, dst
|
||||
/*
|
||||
* Adjust count and bias for loop. By substracting extra 1 from count,
|
||||
* it is easy to use tbz instruction to check whether loop tailing
|
||||
* count is less than 33 bytes, so as to bypass 2 unneccesary stps.
|
||||
*/
|
||||
sub count, count, 128+64+64+1
|
||||
add dst, dst, 128
|
||||
nop
|
||||
|
||||
/* DC ZVA sets 64 bytes each time. */
|
||||
1: dc zva, dst
|
||||
add dst, dst, 64
|
||||
subs count, count, 64
|
||||
b.hi L(no_zva_loop)
|
||||
stp q0, q0, [dstend, -64]
|
||||
stp q0, q0, [dstend, -32]
|
||||
RETURN
|
||||
b.hs 1b
|
||||
|
||||
/*
|
||||
* Write the last 64 byte aligned block using stp to force fully
|
||||
* dirty cache line.
|
||||
*/
|
||||
stp val, val, [dst, 0]
|
||||
stp val, val, [dst, 16]
|
||||
stp val, val, [dst, 32]
|
||||
stp val, val, [dst, 48]
|
||||
|
||||
tbz count, 5, 1f /* Remaining count is less than 33 bytes? */
|
||||
stp val, val, [dst, 64]
|
||||
stp val, val, [dst, 80]
|
||||
1: stp val, val, [dstend, -32]
|
||||
stp val, val, [dstend, -16]
|
||||
ret
|
||||
#endif
|
||||
|
||||
|
||||
END (memset)
|
||||
|
|
|
|||
Loading…
Reference in a new issue