2020-06-16 13:38:43 +00:00
|
|
|
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
2020-06-15 14:18:57 +00:00
|
|
|
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
|
|
|
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
|
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
|
|
|
│ │
|
2020-12-28 01:18:44 +00:00
|
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
|
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
|
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
2020-06-15 14:18:57 +00:00
|
|
|
│ │
|
2020-12-28 01:18:44 +00:00
|
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
|
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
|
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
|
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
|
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
|
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
|
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
|
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
2020-06-15 14:18:57 +00:00
|
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
2021-03-01 07:42:35 +00:00
|
|
|
#include "libc/macros.internal.h"
|
2020-06-16 02:01:28 +00:00
|
|
|
.source __FILE__
|
2020-06-15 14:18:57 +00:00
|
|
|
|
2021-02-08 17:19:00 +00:00
|
|
|
// Returns index of minimum positive int16 in array.
|
|
|
|
|
//
|
|
|
|
|
// @param rdi points to nonempty array
|
|
|
|
|
// @param esi is 16-byte aligned 8+ / 8 multiple array item count
|
|
|
|
|
// @note needs sse4 (nehalem+)
|
2021-02-06 08:24:35 +00:00
|
|
|
windex_sse4:
|
2020-06-15 14:18:57 +00:00
|
|
|
push %rbp
|
|
|
|
|
mov %rsp,%rbp
|
|
|
|
|
.profilable
|
|
|
|
|
mov $8,%eax
|
|
|
|
|
sub $32,%rsp
|
|
|
|
|
movdqa (%rdi),%xmm2
|
|
|
|
|
movdqa .Lidx(%rip),%xmm1
|
|
|
|
|
movdqa .Linc(%rip),%xmm6
|
|
|
|
|
movdqa %xmm1,%xmm3
|
|
|
|
|
0: cmp %eax,%esi
|
|
|
|
|
je 1f
|
|
|
|
|
add $8,%eax
|
|
|
|
|
movdqa -16(%rdi,%rax,2),%xmm4
|
|
|
|
|
movdqa %xmm2,%xmm7
|
|
|
|
|
movdqa %xmm3,%xmm5
|
|
|
|
|
paddw %xmm6,%xmm5
|
|
|
|
|
movdqa %xmm5,%xmm3
|
|
|
|
|
pcmpgtw %xmm4,%xmm7
|
|
|
|
|
pminsw %xmm4,%xmm2
|
|
|
|
|
movdqa %xmm7,%xmm0
|
|
|
|
|
pblendvb %xmm0,%xmm5,%xmm1
|
|
|
|
|
jmp 0b
|
|
|
|
|
1: phminposuw %xmm2,%xmm0
|
|
|
|
|
movd %xmm0,%eax
|
|
|
|
|
movdqa %xmm1,-32(%rbp)
|
|
|
|
|
shr $16,%eax
|
|
|
|
|
movzwl -32(%rbp,%rax,2),%eax
|
|
|
|
|
leave
|
|
|
|
|
ret
|
2021-02-06 08:24:35 +00:00
|
|
|
.endfn windex_sse4,globl
|
2020-06-15 14:18:57 +00:00
|
|
|
|
|
|
|
|
.rodata.cst16
|
|
|
|
|
.Lidx: .short 0,1,2,3,4,5,6,7
|
|
|
|
|
.Linc: .value 8,8,8,8,8,8,8,8
|
