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chihminchaochihminchao
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softfloat: extend bf16 APIs
also add fxx_neg helper functions Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>
1 parent d425703 commit 1b81e40

15 files changed

+614
-5
lines changed

‎softfloat/bf16_classify.c

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#include <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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uint_fast16_t bf16_classify( bfloat16_t a )
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{
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union ui16_f16 uA;
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uint_fast16_t uiA;
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uA.f = a;
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uiA = uA.ui;
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uint_fast16_t infOrNaN = expBF16UI( uiA ) == 0xFF;
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uint_fast16_t subnormalOrZero = expBF16UI( uiA ) == 0;
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bool sign = signBF16UI( uiA );
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bool fracZero = fracBF16UI( uiA ) == 0;
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bool isNaN = isNaNBF16UI( uiA );
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bool isSNaN = softfloat_isSigNaNBF16UI( uiA );
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return
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( sign && infOrNaN && fracZero ) << 0 |
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( sign && !infOrNaN && !subnormalOrZero ) << 1 |
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( sign && subnormalOrZero && !fracZero ) << 2 |
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( sign && subnormalOrZero && fracZero ) << 3 |
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( !sign && infOrNaN && fracZero ) << 7 |
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( !sign && !infOrNaN && !subnormalOrZero ) << 6 |
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( !sign && subnormalOrZero && !fracZero ) << 5 |
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( !sign && subnormalOrZero && fracZero ) << 4 |
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( isNaN && isSNaN ) << 8 |
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( isNaN && !isSNaN ) << 9;
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}
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‎softfloat/bf16_cmp.c

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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3d, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015 The Regents of the University of
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California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "internals.h"
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#include "softfloat.h"
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bool bf16_eq( bfloat16_t a, bfloat16_t b )
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{
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float32_t f32A = { (uint_fast32_t)a.v << 16 };
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float32_t f32B = { (uint_fast32_t)b.v << 16 };
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return f32_eq ( f32A, f32B );
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}
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bool bf16_le( bfloat16_t a, bfloat16_t b )
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{
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float32_t f32A = { (uint_fast32_t)a.v << 16 };
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float32_t f32B = { (uint_fast32_t)b.v << 16 };
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return f32_le ( f32A, f32B );
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}
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bool bf16_lt( bfloat16_t a, bfloat16_t b )
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{
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float32_t f32A = { (uint_fast32_t)a.v << 16 };
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float32_t f32B = { (uint_fast32_t)b.v << 16 };
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return f32_lt ( f32A, f32B );
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}

‎softfloat/bf16_to_i32.c

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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3d, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
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University of California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
26+
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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int_fast32_t bf16_to_i32( bfloat16_t a, uint_fast8_t roundingMode, bool exact )
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{
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return f32_to_i32(bf16_to_f32(a), roundingMode, exact);
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}
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‎softfloat/bf16_to_i8.c

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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3d, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
8+
University of California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
11+
modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
15+
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2. Redistributions in binary form must reproduce the above copyright notice,
17+
this list of conditions, and the following disclaimer in the documentation
18+
and/or other materials provided with the distribution.
19+
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
26+
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
27+
DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30+
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdint.h>
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#include "specialize.h"
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#include "softfloat.h"
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int_fast8_t bf16_to_i8( bfloat16_t a, uint_fast8_t roundingMode, bool exact )
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{
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uint_fast8_t old_flags = softfloat_exceptionFlags;
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int_fast32_t sig32 = bf16_to_i32(a, roundingMode, exact);
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if (sig32 > INT8_MAX) {
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softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
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return i8_fromPosOverflow;
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} else if (sig32 < INT8_MIN) {
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softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
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return i8_fromNegOverflow;
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} else {
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return sig32;
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}
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}
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‎softfloat/bf16_to_ui32.c

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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3d, by John R. Hauser.
6+
7+
Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
8+
University of California. All rights reserved.
9+
10+
Redistribution and use in source and binary forms, with or without
11+
modification, are permitted provided that the following conditions are met:
12+
13+
1. Redistributions of source code must retain the above copyright notice,
14+
this list of conditions, and the following disclaimer.
15+
16+
2. Redistributions in binary form must reproduce the above copyright notice,
17+
this list of conditions, and the following disclaimer in the documentation
18+
and/or other materials provided with the distribution.
19+
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
22+
specific prior written permission.
23+
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
26+
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
27+
DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
28+
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29+
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30+
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32+
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33+
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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uint_fast32_t bf16_to_ui32( float16_t a, uint_fast8_t roundingMode, bool exact )
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{
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return f32_to_ui32(bf16_to_f32(a), roundingMode, exact);
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}
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‎softfloat/bf16_to_ui8.c

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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3d, by John R. Hauser.
6+
7+
Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
8+
University of California. All rights reserved.
9+
10+
Redistribution and use in source and binary forms, with or without
11+
modification, are permitted provided that the following conditions are met:
12+
13+
1. Redistributions of source code must retain the above copyright notice,
14+
this list of conditions, and the following disclaimer.
15+
16+
2. Redistributions in binary form must reproduce the above copyright notice,
17+
this list of conditions, and the following disclaimer in the documentation
18+
and/or other materials provided with the distribution.
19+
20+
3. Neither the name of the University nor the names of its contributors may
21+
be used to endorse or promote products derived from this software without
22+
specific prior written permission.
23+
24+
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
25+
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
26+
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
27+
DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
28+
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29+
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30+
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
31+
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32+
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33+
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdint.h>
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#include "specialize.h"
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#include "softfloat.h"
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uint_fast8_t bf16_to_ui8( bfloat16_t a, uint_fast8_t roundingMode, bool exact )
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{
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uint_fast8_t old_flags = softfloat_exceptionFlags;
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uint_fast32_t sig32 = bf16_to_ui32(a, roundingMode, exact);
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if (sig32 > UINT8_MAX) {
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softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
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return ui8_fromPosOverflow;
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} else {
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return sig32;
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}
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}
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‎softfloat/fall_maxmin.c

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COMPARE_MIN(a, b, 16);
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COMPARE_MIN(a, b, 32);
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COMPARE_MIN(a, b, 64);
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bfloat16_t bf16_max( bfloat16_t a, bfloat16_t b )
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{
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float32_t f32A = { (uint32_t)a.v << 16 };
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float32_t f32B = { (uint32_t)b.v << 16 };
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return f32_to_bf16 ( f32_max( f32A, f32B ) );
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}
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bfloat16_t bf16_min( bfloat16_t a, bfloat16_t b )
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{
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float32_t f32A = { (uint32_t)a.v << 16 };
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float32_t f32B = { (uint32_t)b.v << 16 };
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return f32_to_bf16 ( f32_min( f32A, f32B ) );
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}

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