136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/*
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* Milkymist SoC (Software)
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* Copyright (C) 2007, 2008, 2009 Sebastien Bourdeauducq
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "softfloat.h"
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/*
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* 'Equal' wrapper. This returns 0 if the numbers are equal, or (1 | -1)
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* otherwise. So we need to invert the output.
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*/
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int __eqsf2(float32 a, float32 b)
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{
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return !float32_eq(a, b);
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}
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/*
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* 'Not Equal' wrapper. This returns -1 or 1 (say, 1!) if the numbers are
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* not equal, 0 otherwise. However no not equal call is provided, so we have
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* to use an 'equal' call and invert the result. The result is already
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* inverted though! Confusing?!
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*/
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int __nesf2(float32 a, float32 b)
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{
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return !float32_eq(a, b);
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}
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/*
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* 'Greater Than' wrapper. This returns 1 if the number is greater, 0
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* or -1 otherwise. Unfortunately, no such function exists. We have to
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* instead compare the numbers using the 'less than' calls in order to
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* make up our mind. This means that we can call 'less than or equal' and
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* invert the result.
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*/
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int __gtsf2(float32 a, float32 b)
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{
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return !float32_le(a, b);
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}
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/*
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* 'Greater Than or Equal' wrapper. We emulate this by inverting the result
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* of a 'less than' call.
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*/
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int __gesf2(float32 a, float32 b)
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{
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return !float32_lt(a, b);
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}
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/*
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* 'Less Than' wrapper.
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*/
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int __ltsf2(float32 a, float32 b)
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{
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return float32_lt(a, b);
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}
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/*
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* 'Less Than or Equal' wrapper. A 0 must turn into a 1, and a 1 into a 0.
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*/
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int __lesf2(float32 a, float32 b)
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{
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return !float32_le(a, b);
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}
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/*
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* Float negate... This isn't provided by the library, but it's hardly the
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* hardest function in the world to write... :) In fact, because of the
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* position in the registers of arguments, the double precision version can
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* go here too ;-)
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*/
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float32 __negsf2(float32 x)
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{
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return x ^ 0x80000000;
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}
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/*
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* 32-bit operations.
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*/
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float32 __addsf3(float32 a, float32 b)
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{
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return float32_add(a, b);
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}
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float32 __subsf3(float32 a, float32 b)
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{
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return float32_sub(a, b);
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}
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float32 __mulsf3(float32 a, float32 b)
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{
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return float32_mul(a, b);
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}
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float32 __divsf3(float32 a, float32 b)
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{
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return float32_div(a, b);
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}
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float32 __floatsisf(int x)
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{
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return int32_to_float32(x);
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}
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int __fixsfsi(float32 x)
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{
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return float32_to_int32_round_to_zero(x);
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}
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unsigned int __fixunssfsi(float32 x)
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{
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return float32_to_int32_round_to_zero(x); // XXX
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}
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int __unordsf2(float32 a, float32 b)
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{
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/*
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* The comparison is unordered if either input is a NaN.
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* Test for this by comparing each operand with itself.
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* We must perform both comparisons to correctly check for
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* signalling NaNs.
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*/
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return 1 ^ (float32_eq(a, a) & float32_eq(b, b));
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}
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