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1ac832509f
The Andes FPU coprocessor does not support denormalized number handling. According to the specification, FPU generates a denorm input exception that requires the kernel to deal with this instrution operation when it encounters denormalized operands. Hence an nds32 FPU ISA emulator in the kernel is required to meet requirement. Signed-off-by: Vincent Chen <vincentc@andestech.com> Signed-off-by: Nickhu <nickhu@andestech.com> Acked-by: Greentime Hu <greentime@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com>
28 lines
472 B
C
28 lines
472 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2018 Andes Technology Corporation
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#include <linux/uaccess.h>
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#include <asm/sfp-machine.h>
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#include <math-emu/soft-fp.h>
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#include <math-emu/double.h>
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void fsubd(void *ft, void *fa, void *fb)
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{
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FP_DECL_D(A);
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FP_DECL_D(B);
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FP_DECL_D(R);
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FP_DECL_EX;
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FP_UNPACK_DP(A, fa);
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FP_UNPACK_DP(B, fb);
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if (B_c != FP_CLS_NAN)
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B_s ^= 1;
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FP_ADD_D(R, A, B);
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FP_PACK_DP(ft, R);
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__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
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}
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