mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-01-31 19:43:32 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions
cosmopolitan/libc/tinymath/round.S

69 lines
2.9 KiB
ArmAsm
Raw Normal View History

Polish up repository and other revisions
2020-06-16 13:38:43 +00:00
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
Initial import
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 │
│ │
Change license
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. │
Initial import
2020-06-15 14:18:57 +00:00
│ │
Change license
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. │
Initial import
2020-06-15 14:18:57 +00:00
╚─────────────────────────────────────────────────────────────────────────────*/
Remove more nonstandard stuff from cosmopolitan.h Fixes #61
2021-03-01 07:42:35 +00:00
#include "libc/macros.internal.h"
Get Cosmopolitan into releasable state A new rollup tool now exists for flattening out the headers in a way that works better for our purposes than cpp. A lot of the API clutter has been removed. APIs that aren't a sure thing in terms of general recommendation are now marked internal. There's now a smoke test for the amalgamation archive and gigantic header file. So we can now guarantee you can use this project on the easiest difficulty setting without the gigantic repository. A website is being created, which is currently a work in progress: https://justine.storage.googleapis.com/cosmopolitan/index.html
2020-11-25 16:19:00 +00:00
#include "libc/bits/smmintrin.internal.h"
Initial import
2020-06-15 14:18:57 +00:00
#include "libc/nexgen32e/x86feature.h"
Get codebase completely working with LLVM You can now build Cosmopolitan with Clang: make -j8 MODE=llvm o/llvm/examples/hello.com The assembler and linker code is now friendly to LLVM too. So it's not needed to configure Clang to use binutils under the hood. If you love LLVM then you can now use pure LLVM.
2021-02-08 17:19:00 +00:00
// Rounds to nearest integer, away from zero.
//
// @param 𝑥 is double scalar in low half of %xmm0
// @return double scalar in low half of %xmm0
// @define round(𝑥) = copysign(trunc(fabs(𝑥)+.5),𝑥)
// round(𝑥) = trunc(𝑥+copysign(.5,𝑥))
Remove sun musl fdlibm math library The libm code from musl wasn't being used since most of these functions are implemented using x87 which goes faster than a library intended for risc machines.
2021-02-01 02:25:16 +00:00
round:
Initial import
2020-06-15 14:18:57 +00:00
#if !X86_NEED(SSE4_2)
testb X86_HAVE(SSE4_2)+kCpuids(%rip)
Remove sun musl fdlibm math library The libm code from musl wasn't being used since most of these functions are implemented using x87 which goes faster than a library intended for risc machines.
2021-02-01 02:25:16 +00:00
jz round$k8
Initial import
2020-06-15 14:18:57 +00:00
.text.antiquity
Remove sun musl fdlibm math library The libm code from musl wasn't being used since most of these functions are implemented using x87 which goes faster than a library intended for risc machines.
2021-02-01 02:25:16 +00:00
round$k8:
Initial import
2020-06-15 14:18:57 +00:00
.leafprologue
.profilable
movapd %xmm0,%xmm1
movsd D(%rip),%xmm2
movsd C(%rip),%xmm3
andpd %xmm2,%xmm1
ucomisd %xmm1,%xmm3
jbe 2f
addsd A(%rip),%xmm1
andnpd %xmm0,%xmm2
movapd %xmm2,%xmm0
cvttsd2siq %xmm1,%rax
pxor %xmm1,%xmm1
cvtsi2sdq %rax,%xmm1
orpd %xmm1,%xmm0
2: .leafepilogue
Remove sun musl fdlibm math library The libm code from musl wasn't being used since most of these functions are implemented using x87 which goes faster than a library intended for risc machines.
2021-02-01 02:25:16 +00:00
.endfn round$k8,globl,hidden
Initial import
2020-06-15 14:18:57 +00:00
.previous
.rodata.cst16
C: .quad 0x4330000000000000,0
D: .quad 0x7fffffffffffffff,0
.previous
#endif
movapd %xmm0,%xmm1
andpd B(%rip),%xmm0
orpd A(%rip),%xmm0
addsd %xmm1,%xmm0
roundsd $_MM_FROUND_TO_ZERO,%xmm0,%xmm0
ret
Remove sun musl fdlibm math library The libm code from musl wasn't being used since most of these functions are implemented using x87 which goes faster than a library intended for risc machines.
2021-02-01 02:25:16 +00:00
.endfn round,globl
Initial import
2020-06-15 14:18:57 +00:00
.rodata.cst16
A: .quad 0x3fdfffffffffffff,0
B: .quad 0x8000000000000000,0
Reference in a new issue Copy permalink