From 84e2dca8c41fe436dae82dd0413a89a335f9a7f8 Mon Sep 17 00:00:00 2001 From: Andrew Waterman Date: Wed, 19 Apr 2023 15:54:25 -0700 Subject: Add f64_to_bf16; fix f32_to_bf16 --- softfloat/f32_to_bf16.c | 41 +--------------------- softfloat/f64_to_bf16.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++ softfloat/softfloat.h | 1 + softfloat/softfloat.mk.in | 1 + 4 files changed, 91 insertions(+), 40 deletions(-) create mode 100644 softfloat/f64_to_bf16.c diff --git a/softfloat/f32_to_bf16.c b/softfloat/f32_to_bf16.c index 615f858..929def7 100644 --- a/softfloat/f32_to_bf16.c +++ b/softfloat/f32_to_bf16.c @@ -43,45 +43,6 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 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; - 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; - } - /*------------------------------------------------------------------------ - *------------------------------------------------------------------------*/ - frac16 = frac>>9 | ((frac & 0x1FF) != 0); - if ( ! (exp | frac16) ) { - uiZ = packToBF16UI( sign, 0, 0 ); - goto uiZ; - } - /*------------------------------------------------------------------------ - *------------------------------------------------------------------------*/ - return softfloat_roundPackToBF16( sign, exp - 1, frac16 | 0x4000 ); - uiZ: - uZ.ui = uiZ; - return uZ.f; - + return f64_to_bf16( f32_to_f64( a ) ); } diff --git a/softfloat/f64_to_bf16.c b/softfloat/f64_to_bf16.c new file mode 100644 index 0000000..d99d5e4 --- /dev/null +++ b/softfloat/f64_to_bf16.c @@ -0,0 +1,88 @@ + +/*============================================================================ + +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 +#include +#include "platform.h" +#include "internals.h" +#include "specialize.h" +#include "softfloat.h" + +bfloat16_t f64_to_bf16( float64_t a ) +{ + union ui64_f64 uA; + uint_fast64_t uiA; + bool sign; + int_fast16_t exp; + uint_fast64_t frac; + struct commonNaN commonNaN; + uint_fast16_t uiZ, frac16; + union ui16_f16 uZ; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uA.f = a; + uiA = uA.ui; + sign = signF64UI( uiA ); + exp = expF64UI( uiA ); + frac = fracF64UI( uiA ); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( exp == 0x7FF ) { + if ( frac ) { + softfloat_f64UIToCommonNaN( uiA, &commonNaN ); + uiZ = softfloat_commonNaNToBF16UI( &commonNaN ); + } else { + uiZ = packToBF16UI( sign, 0xFF, 0 ); + } + goto uiZ; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + frac16 = softfloat_shortShiftRightJam64( frac, 38 ); + if ( ! (exp | frac16) ) { + uiZ = packToBF16UI( sign, 0, 0 ); + goto uiZ; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + return softfloat_roundPackToBF16( sign, exp - 0x381, frac16 | 0x4000 ); + uiZ: + uZ.ui = uiZ; + return uZ.f; + +} + diff --git a/softfloat/softfloat.h b/softfloat/softfloat.h index eb78d74..17b6b2c 100644 --- a/softfloat/softfloat.h +++ b/softfloat/softfloat.h @@ -238,6 +238,7 @@ uint_fast64_t f64_to_ui64_r_minMag( float64_t, bool ); int_fast32_t f64_to_i32_r_minMag( float64_t, bool ); int_fast64_t f64_to_i64_r_minMag( float64_t, bool ); float16_t f64_to_f16( float64_t ); +bfloat16_t f64_to_bf16( float64_t ); float32_t f64_to_f32( float64_t ); #ifdef SOFTFLOAT_FAST_INT64 extFloat80_t f64_to_extF80( float64_t ); diff --git a/softfloat/softfloat.mk.in b/softfloat/softfloat.mk.in index 9c780ac..14ff6c5 100644 --- a/softfloat/softfloat.mk.in +++ b/softfloat/softfloat.mk.in @@ -107,6 +107,7 @@ softfloat_c_srcs = \ f64_sqrt.c \ f64_sub.c \ f64_to_f128.c \ + f64_to_bf16.c \ f64_to_f16.c \ f64_to_f32.c \ f64_to_i32.c \ -- cgit v1.1