mirror of
https://github.com/jart/cosmopolitan.git
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97 lines
3 KiB
C
97 lines
3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2024 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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/**
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* @fileoverview bf16 compiler runtime
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*/
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_Float32 __extendbfsf2(__bf16 f) {
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union {
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__bf16 f;
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uint16_t i;
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} ub = {f};
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// convert brain16 to binary32
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uint32_t x = (uint32_t)ub.i << 16;
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// force nan to quiet
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if ((x & 0x7fffffff) > 0x7f800000)
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x |= 0x00400000;
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// pun to _Float32
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union {
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uint32_t i;
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_Float32 f;
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} uf = {x};
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return uf.f;
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}
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_Float64 __extendbfdf2(__bf16 f) {
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return __extendbfsf2(f);
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}
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#ifdef __x86_64__
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__float80 __extendbfxf2(__bf16 f) {
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return __extendbfsf2(f);
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}
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#endif
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#ifdef __aarch64__
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_Float128 __extendbftf2(__bf16 f) {
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return __extendbfsf2(f);
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}
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#endif
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__bf16 __truncsfbf2(_Float32 f) {
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union {
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_Float32 f;
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uint32_t i;
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} uf = {f};
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uint32_t x = uf.i;
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if ((x & 0x7fffffff) > 0x7f800000)
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// force nan to quiet
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x = (x | 0x00400000) >> 16;
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else
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// convert binary32 to brain16 with nearest rounding
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x = (x + (0x7fff + ((x >> 16) & 1))) >> 16;
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// pun to bf16
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union {
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uint16_t i;
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__bf16 f;
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} ub = {x};
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return ub.f;
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}
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__bf16 __truncdfbf2(_Float64 f) {
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return __truncsfbf2(f);
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}
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#ifdef __x86_64__
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__bf16 __truncxfbf2(__float80 f) {
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return __truncsfbf2(f);
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}
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#endif
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#ifdef __aarch64__
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__bf16 __trunctfbf2(_Float128 f) {
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return __truncsfbf2(f);
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}
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#endif
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