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https://github.com/autc04/Retro68.git
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149 lines
3.8 KiB
ArmAsm
149 lines
3.8 KiB
ArmAsm
/*
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Copyright (c) 2015, Synopsys, Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1) Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2) Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3) Neither the name of the Synopsys, Inc., nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* This implementation is optimized for performance. For code size a generic
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implementation of this function from newlib/libc/string/memset.c will be
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used. */
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#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED)
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#include "asm.h"
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#ifdef __ARCHS__
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#define USE_PREFETCH
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#ifdef USE_PREFETCH
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#define PREWRITE(A,B) prefetchw [(A),(B)]
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#else
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#define PREWRITE(A,B) prealloc [(A),(B)]
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#endif
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ENTRY (memset)
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prefetchw [r0] ; Prefetch the write location
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mov.f 0, r2
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; if size is zero
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jz.d [blink]
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mov r3, r0 ; don't clobber ret val
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; if length < 8
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brls.d.nt r2, 8, .Lsmallchunk
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mov.f lp_count,r2
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and.f r4, r0, 0x03
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rsub lp_count, r4, 4
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lpnz @.Laligndestination
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; LOOP BEGIN
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stb.ab r1, [r3,1]
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sub r2, r2, 1
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.Laligndestination:
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; Destination is aligned
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and r1, r1, 0xFF
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asl r4, r1, 8
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or r4, r4, r1
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asl r5, r4, 16
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or r5, r5, r4
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mov r4, r5
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sub3 lp_count, r2, 8
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cmp r2, 64
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bmsk.hi r2, r2, 5
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mov.ls lp_count, 0
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add3.hi r2, r2, 8
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; Convert len to Dwords, unfold x8
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lsr.f lp_count, lp_count, 6
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lpnz @.Lset64bytes
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; LOOP START
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PREWRITE (r3, 64) ;Prefetch the next write location
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#ifdef __ARC_LL64__
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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#else
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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#endif
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.Lset64bytes:
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lsr.f lp_count, r2, 5 ;Last remaining max 124 bytes
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lpnz .Lset32bytes
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; LOOP START
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prefetchw [r3, 32] ;Prefetch the next write location
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#ifdef __ARC_LL64__
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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std.ab r4, [r3, 8]
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#else
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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st.ab r4, [r3, 4]
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#endif
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.Lset32bytes:
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and.f lp_count, r2, 0x1F ;Last remaining 31 bytes
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.Lsmallchunk:
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lpnz .Lcopy3bytes
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; LOOP START
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stb.ab r1, [r3, 1]
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.Lcopy3bytes:
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j [blink]
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ENDFUNC (memset)
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#endif /* __ARCHS__ */
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#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */
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