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https://github.com/jart/cosmopolitan.git
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60 lines
2.6 KiB
ArmAsm
60 lines
2.6 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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// Returns index of minimum positive int16 in array.
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//
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// @param rdi points to nonempty array
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// @param esi is 16-byte aligned 8+ / 8 multiple array item count
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// @note needs sse4 (nehalem+)
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windex_sse4:
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push %rbp
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mov %rsp,%rbp
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.profilable
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mov $8,%eax
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sub $32,%rsp
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movdqa (%rdi),%xmm2
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movdqa .Lidx(%rip),%xmm1
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movdqa .Linc(%rip),%xmm6
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movdqa %xmm1,%xmm3
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0: cmp %eax,%esi
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je 1f
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add $8,%eax
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movdqa -16(%rdi,%rax,2),%xmm4
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movdqa %xmm2,%xmm7
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movdqa %xmm3,%xmm5
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paddw %xmm6,%xmm5
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movdqa %xmm5,%xmm3
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pcmpgtw %xmm4,%xmm7
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pminsw %xmm4,%xmm2
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movdqa %xmm7,%xmm0
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pblendvb %xmm0,%xmm5,%xmm1
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jmp 0b
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1: phminposuw %xmm2,%xmm0
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movd %xmm0,%eax
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movdqa %xmm1,-32(%rbp)
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shr $16,%eax
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movzwl -32(%rbp,%rax,2),%eax
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leave
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ret
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.endfn windex_sse4,globl
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.rodata.cst16
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.Lidx: .short 0,1,2,3,4,5,6,7
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.Linc: .value 8,8,8,8,8,8,8,8
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