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author | Weiwei Li <liweiwei@iscas.ac.cn> | 2023-04-14 22:35:12 +0800 |
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committer | Weiwei Li <liweiwei@iscas.ac.cn> | 2023-05-29 09:01:21 +0800 |
commit | afe3987685f11058b28988ac9d7e484368246937 (patch) | |
tree | 59b310b3600f5464d34968ecb2affe838577aa98 | |
parent | 740e6353a166ec3ba936b200482d6fc381b8082b (diff) | |
download | riscv-isa-sim-afe3987685f11058b28988ac9d7e484368246937.zip riscv-isa-sim-afe3987685f11058b28988ac9d7e484368246937.tar.gz riscv-isa-sim-afe3987685f11058b28988ac9d7e484368246937.tar.bz2 |
Add convertion function between binary float16 and float32 in softfloat
-rw-r--r-- | softfloat/bf16_to_f32.c | 80 | ||||
-rw-r--r-- | softfloat/f32_to_bf16.c | 92 | ||||
-rw-r--r-- | softfloat/internals.h | 6 | ||||
-rw-r--r-- | softfloat/s_roundPackToBF16.c | 113 | ||||
-rw-r--r-- | softfloat/softfloat.h | 2 | ||||
-rw-r--r-- | softfloat/softfloat.mk.in | 3 | ||||
-rw-r--r-- | softfloat/softfloat_types.h | 1 | ||||
-rw-r--r-- | softfloat/specialize.h | 19 |
8 files changed, 316 insertions, 0 deletions
diff --git a/softfloat/bf16_to_f32.c b/softfloat/bf16_to_f32.c new file mode 100644 index 0000000..7e49002 --- /dev/null +++ b/softfloat/bf16_to_f32.c @@ -0,0 +1,80 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3d, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the +University of California. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions, and the following disclaimer. + + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions, and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3. Neither the name of the University nor the names of its contributors may + be used to endorse or promote products derived from this software without + specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE +DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=============================================================================*/ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "internals.h" +#include "specialize.h" +#include "softfloat.h" + +float32_t bf16_to_f32( bfloat16_t a ) +{ + union ui16_f16 uA; + uint_fast16_t uiA; + bool sign; + int_fast16_t exp; + uint_fast16_t frac; + struct commonNaN commonNaN; + uint_fast32_t uiZ; + union ui32_f32 uZ; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uA.f = a; + uiA = uA.ui; + sign = signBF16UI( uiA ); + exp = expBF16UI( uiA ); + frac = fracBF16UI( uiA ); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( exp == 0xFF ) { + if ( frac ) { + softfloat_bf16UIToCommonNaN( uiA, &commonNaN ); + uiZ = softfloat_commonNaNToF32UI( &commonNaN ); + } else { + uiZ = packToF32UI( sign, 0xFF, 0 ); + } + goto uiZ; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uiZ = packToF32UI( sign, exp, (uint_fast32_t) frac<<16 ); + uiZ: + uZ.ui = uiZ; + return uZ.f; + +} diff --git a/softfloat/f32_to_bf16.c b/softfloat/f32_to_bf16.c new file mode 100644 index 0000000..92a2e6d --- /dev/null +++ b/softfloat/f32_to_bf16.c @@ -0,0 +1,92 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3d, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014, 2015 The Regents of the University of +California. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions, and the following disclaimer. + + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions, and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3. Neither the name of the University nor the names of its contributors may + be used to endorse or promote products derived from this software without + specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE +DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=============================================================================*/ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "internals.h" +#include "specialize.h" +#include "softfloat.h" + +bfloat16_t f32_to_bf16( float32_t a ) +{ + union ui32_f32 uA; + uint_fast32_t uiA; + bool sign; + int_fast16_t exp; + uint_fast32_t frac; + struct commonNaN commonNaN; + struct exp16_sig32 normExpSig; + uint_fast16_t uiZ, frac16; + union ui16_f16 uZ; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uA.f = a; + uiA = uA.ui; + sign = signF32UI( uiA ); + exp = expF32UI( uiA ); + frac = fracF32UI( uiA ); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( exp == 0xFF ) { + if ( frac ) { + softfloat_f32UIToCommonNaN( uiA, &commonNaN ); + uiZ = softfloat_commonNaNToBF16UI( &commonNaN ); + } else { + uiZ = packToBF16UI( sign, 0xFF, 0 ); + } + goto uiZ; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( ! (exp | frac) ) { + uiZ = packToBF16UI( sign, 0, 0 ); + goto uiZ; + } else if ( !exp ) { + normExpSig = softfloat_normSubnormalF32Sig( frac ); + exp = normExpSig.exp; + frac = normExpSig.sig; + } + frac16 = frac>>9 | ((frac & 0x1FF) != 0); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + return softfloat_roundPackToBF16( sign, exp - 1, frac16 | 0x4000 ); + uiZ: + uZ.ui = uiZ; + return uZ.f; + +} diff --git a/softfloat/internals.h b/softfloat/internals.h index 55585e9..ae94427 100644 --- a/softfloat/internals.h +++ b/softfloat/internals.h @@ -89,6 +89,11 @@ int_fast64_t softfloat_roundMToI64( bool, uint32_t *, uint_fast8_t, bool ); #define fracF16UI( a ) ((a) & 0x03FF) #define packToF16UI( sign, exp, sig ) (((uint16_t) (sign)<<15) + ((uint16_t) (exp)<<10) + (sig)) +#define signBF16UI( a ) ((bool) ((uint16_t) (a)>>15)) +#define expBF16UI( a ) ((int_fast16_t) ((a)>>7) & 0xFF) +#define fracBF16UI( a ) ((a) & 0x07F) +#define packToBF16UI( sign, exp, sig ) (((uint16_t) (sign)<<15) + ((uint16_t) (exp)<<7) + (sig)) + #define isNaNF16UI( a ) (((~(a) & 0x7C00) == 0) && ((a) & 0x03FF)) struct exp8_sig16 { int_fast8_t exp; uint_fast16_t sig; }; @@ -103,6 +108,7 @@ float16_t softfloat_mulAddF16( uint_fast16_t, uint_fast16_t, uint_fast16_t, uint_fast8_t ); +bfloat16_t softfloat_roundPackToBF16( bool, int_fast16_t, uint_fast16_t ); /*---------------------------------------------------------------------------- *----------------------------------------------------------------------------*/ #define signF32UI( a ) ((bool) ((uint32_t) (a)>>31)) diff --git a/softfloat/s_roundPackToBF16.c b/softfloat/s_roundPackToBF16.c new file mode 100644 index 0000000..f3d0b75 --- /dev/null +++ b/softfloat/s_roundPackToBF16.c @@ -0,0 +1,113 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3d, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014, 2015, 2017 The Regents of the University of +California. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions, and the following disclaimer. + + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions, and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3. Neither the name of the University nor the names of its contributors may + be used to endorse or promote products derived from this software without + specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE +DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=============================================================================*/ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "internals.h" +#include "softfloat.h" + +bfloat16_t + softfloat_roundPackToBF16( bool sign, int_fast16_t exp, uint_fast16_t sig ) +{ + uint_fast8_t roundingMode; + bool roundNearEven; + uint_fast8_t roundIncrement, roundBits; + bool isTiny; + uint_fast16_t uiZ; + union ui16_f16 uZ; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + roundingMode = softfloat_roundingMode; + roundNearEven = (roundingMode == softfloat_round_near_even); + roundIncrement = 0x40; + if ( ! roundNearEven && (roundingMode != softfloat_round_near_maxMag) ) { + roundIncrement = + (roundingMode + == (sign ? softfloat_round_min : softfloat_round_max)) + ? 0x7F + : 0; + } + roundBits = sig & 0x7F; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( 0xFD <= (unsigned int) exp ) { + if ( exp < 0 ) { + /*---------------------------------------------------------------- + *----------------------------------------------------------------*/ + isTiny = + (softfloat_detectTininess == softfloat_tininess_beforeRounding) + || (exp < -1) || (sig + roundIncrement < 0x8000); + sig = softfloat_shiftRightJam32( sig, -exp ); + exp = 0; + roundBits = sig & 0x7F; + if ( isTiny && roundBits ) { + softfloat_raiseFlags( softfloat_flag_underflow ); + } + } else if ( (0xFD < exp) || (0x8000 <= sig + roundIncrement) ) { + /*---------------------------------------------------------------- + *----------------------------------------------------------------*/ + softfloat_raiseFlags( + softfloat_flag_overflow | softfloat_flag_inexact ); + uiZ = packToBF16UI( sign, 0xFF, 0 ) - ! roundIncrement; + goto uiZ; + } + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + sig = (sig + roundIncrement)>>7; + if ( roundBits ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; +#ifdef SOFTFLOAT_ROUND_ODD + if ( roundingMode == softfloat_round_odd ) { + sig |= 1; + goto packReturn; + } +#endif + } + sig &= ~(uint_fast16_t) (! (roundBits ^ 0x40) & roundNearEven); + if ( ! sig ) exp = 0; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + packReturn: + uiZ = packToBF16UI( sign, exp, sig ); + uiZ: + uZ.ui = uiZ; + return uZ.f; + +} + diff --git a/softfloat/softfloat.h b/softfloat/softfloat.h index bdac1be..eb78d74 100644 --- a/softfloat/softfloat.h +++ b/softfloat/softfloat.h @@ -154,6 +154,7 @@ uint_fast64_t f16_to_ui64_r_minMag( float16_t, bool ); int_fast32_t f16_to_i32_r_minMag( float16_t, bool ); int_fast64_t f16_to_i64_r_minMag( float16_t, bool ); float32_t f16_to_f32( float16_t ); +float32_t bf16_to_f32( bfloat16_t ); float64_t f16_to_f64( float16_t ); #ifdef SOFTFLOAT_FAST_INT64 extFloat80_t f16_to_extF80( float16_t ); @@ -196,6 +197,7 @@ uint_fast64_t f32_to_ui64_r_minMag( float32_t, bool ); int_fast32_t f32_to_i32_r_minMag( float32_t, bool ); int_fast64_t f32_to_i64_r_minMag( float32_t, bool ); float16_t f32_to_f16( float32_t ); +bfloat16_t f32_to_bf16( float32_t ); float64_t f32_to_f64( float32_t ); #ifdef SOFTFLOAT_FAST_INT64 extFloat80_t f32_to_extF80( float32_t ); diff --git a/softfloat/softfloat.mk.in b/softfloat/softfloat.mk.in index e7f4a3e..9c780ac 100644 --- a/softfloat/softfloat.mk.in +++ b/softfloat/softfloat.mk.in @@ -45,6 +45,7 @@ softfloat_c_srcs = \ f16_sqrt.c \ f16_sub.c \ f16_to_f128.c \ + bf16_to_f32.c \ f16_to_f32.c \ f16_to_f64.c \ f16_to_i8.c \ @@ -76,6 +77,7 @@ softfloat_c_srcs = \ f32_sqrt.c \ f32_sub.c \ f32_to_f128.c \ + f32_to_bf16.c \ f32_to_f16.c \ f32_to_f64.c \ f32_to_i16.c \ @@ -181,6 +183,7 @@ softfloat_c_srcs = \ s_roundMToUI64.c \ s_roundPackMToI64.c \ s_roundPackMToUI64.c \ + s_roundPackToBF16.c \ s_roundPackToF128.c \ s_roundPackToF16.c \ s_roundPackToF32.c \ diff --git a/softfloat/softfloat_types.h b/softfloat/softfloat_types.h index af1888f..34c518f 100644 --- a/softfloat/softfloat_types.h +++ b/softfloat/softfloat_types.h @@ -48,6 +48,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | (typically 'float' and 'double', and possibly 'long double'). *----------------------------------------------------------------------------*/ typedef struct { uint16_t v; } float16_t; +typedef float16_t bfloat16_t; typedef struct { uint32_t v; } float32_t; typedef struct { uint64_t v; } float64_t; typedef struct { uint64_t v[2]; } float128_t; diff --git a/softfloat/specialize.h b/softfloat/specialize.h index 19504b6..fb3761d 100644 --- a/softfloat/specialize.h +++ b/softfloat/specialize.h @@ -99,6 +99,11 @@ struct commonNaN { char _unused; }; #define defaultNaNF16UI 0x7E00 /*---------------------------------------------------------------------------- +| The bit pattern for a default generated binary 16-bit floating-point NaN. +*----------------------------------------------------------------------------*/ +#define defaultNaNBF16UI 0x7FC0 + +/*---------------------------------------------------------------------------- | Returns true when 16-bit unsigned integer `uiA' has the bit pattern of a | 16-bit floating-point signaling NaN. | Note: This macro evaluates its argument more than once. @@ -114,6 +119,20 @@ struct commonNaN { char _unused; }; #define softfloat_f16UIToCommonNaN( uiA, zPtr ) if ( ! ((uiA) & 0x0200) ) (void) (zPtr), softfloat_raiseFlags( softfloat_flag_invalid ) /*---------------------------------------------------------------------------- +| Assuming `uiA' has the bit pattern of a binary 16-bit floating-point NaN, converts +| this NaN to the common NaN form, and stores the resulting common NaN at the +| location pointed to by `zPtr'. If the NaN is a signaling NaN, the invalid +| exception is raised. +*----------------------------------------------------------------------------*/ +#define softfloat_bf16UIToCommonNaN( uiA, zPtr ) if ( ! ((uiA) & 0x040) ) (void) (zPtr), softfloat_raiseFlags( softfloat_flag_invalid ) + +/*---------------------------------------------------------------------------- +| Converts the common NaN pointed to by `aPtr' into a binary 16-bit floating-point +| NaN, and returns the bit pattern of this value as an unsigned integer. +*----------------------------------------------------------------------------*/ +#define softfloat_commonNaNToBF16UI( aPtr ) ((uint_fast16_t) defaultNaNBF16UI) + +/*---------------------------------------------------------------------------- | Converts the common NaN pointed to by `aPtr' into a 16-bit floating-point | NaN, and returns the bit pattern of this value as an unsigned integer. *----------------------------------------------------------------------------*/ |