mirror of https://gitee.com/openkylin/linux.git
50 lines
891 B
C
50 lines
891 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/* IEEE754 floating point arithmetic
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* single precision
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*/
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/*
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* MIPS floating point support
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* Copyright (C) 1994-2000 Algorithmics Ltd.
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*/
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#include "ieee754sp.h"
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union ieee754sp ieee754sp_neg(union ieee754sp x)
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{
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union ieee754sp y;
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if (ieee754_csr.abs2008) {
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y = x;
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SPSIGN(y) = !SPSIGN(x);
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} else {
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unsigned int oldrm;
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oldrm = ieee754_csr.rm;
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ieee754_csr.rm = FPU_CSR_RD;
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y = ieee754sp_sub(ieee754sp_zero(0), x);
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ieee754_csr.rm = oldrm;
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}
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return y;
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}
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union ieee754sp ieee754sp_abs(union ieee754sp x)
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{
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union ieee754sp y;
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if (ieee754_csr.abs2008) {
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y = x;
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SPSIGN(y) = 0;
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} else {
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unsigned int oldrm;
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oldrm = ieee754_csr.rm;
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ieee754_csr.rm = FPU_CSR_RD;
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if (SPSIGN(x))
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y = ieee754sp_sub(ieee754sp_zero(0), x);
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else
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y = ieee754sp_add(ieee754sp_zero(0), x);
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ieee754_csr.rm = oldrm;
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}
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return y;
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}
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