63 lines
2.7 KiB
ArmAsm
63 lines
2.7 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ 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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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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.source __FILE__
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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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