mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
eb40cb371d
This change implements a new approach to function call logging, that's based on the GCC flag: -fpatchable-function-entry. Read the commentary in build/config.mk to learn how it works.
71 lines
2.9 KiB
ArmAsm
71 lines
2.9 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
|
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ 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. │
|
|
│ │
|
|
│ 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. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/macros.internal.h"
|
|
|
|
// Returns index of minimum uint16 in array.
|
|
//
|
|
// @param rdi points to nonempty array
|
|
// @param rsi is item count divisible by 16
|
|
// @note needs avx2 (haswell+)
|
|
.ftrace1
|
|
windex_avx2:
|
|
.ftrace2
|
|
push %rbp
|
|
mov %rsp,%rbp
|
|
and $-32,%rsp
|
|
sub $32,%rsp
|
|
vmovdqa (%rdi),%ymm1
|
|
vmovdqa .Lidx(%rip),%ymm3
|
|
vmovdqa .Linc(%rip),%ymm5
|
|
cmp $16,%esi
|
|
jbe 2f
|
|
vmovdqa %ymm3,%ymm0
|
|
mov $16,%eax
|
|
3: vpaddw %ymm0,%ymm5,%ymm0
|
|
mov %eax,%edx
|
|
vmovdqa (%rdi,%rdx,2),%ymm2
|
|
vpcmpgtw %ymm2,%ymm1,%ymm4
|
|
vpblendvb %ymm4,%ymm0,%ymm3,%ymm3
|
|
vpminsw %ymm1,%ymm2,%ymm1
|
|
add $16,%eax
|
|
cmp %eax,%esi
|
|
ja 3b
|
|
2: vphminposuw %xmm1,%xmm0
|
|
vextracti128 $0x1,%ymm1,%xmm1
|
|
vphminposuw %xmm1,%xmm1
|
|
vmovdqa %ymm3,(%rsp)
|
|
vmovq %xmm0,%rdx
|
|
vmovq %xmm1,%rax
|
|
cmp %dx,%ax
|
|
jbe 4f
|
|
sar $16,%rdx
|
|
movzwl %dx,%edx
|
|
movzwl (%rsp,%rdx,2),%eax
|
|
jmp 5f
|
|
4: sar $16,%rax
|
|
movzwl %ax,%eax
|
|
movzwl 16(%rsp,%rax,2),%eax
|
|
5: vzeroupper
|
|
leave
|
|
ret
|
|
.endfn windex_avx2,globl
|
|
|
|
.rodata.cst32
|
|
.Lidx: .short 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
|
|
.Linc: .value 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16
|