diff options
| author | Vincent Chen <vincentc@andestech.com> | 2019-05-20 09:21:13 +0800 |
|---|---|---|
| committer | Greentime Hu <greentime@andestech.com> | 2019-05-31 15:23:26 +0800 |
| commit | 932296120543149e3397af252e7daee7af37eb05 (patch) | |
| tree | ad3c0a00a16cae8cab3d85c3b74060893003ee83 /arch/nds32/math-emu/fd2ui.c | |
| parent | ed32949e0acb73e7bc054bb02e0453d4d561ceda (diff) | |
nds32: add new emulations for floating point instruction
The existing floating point emulations is only available for floating
instruction that possibly issue denormalized input and underflow
exceptions. These existing FPU emulations are not sufficient when IEx
Trap is enabled because some floating point instructions only issue inexact
exception. This patch adds the emulations of such floating point
instructions.
Signed-off-by: Vincent Chen <vincentc@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
Diffstat (limited to 'arch/nds32/math-emu/fd2ui.c')
| -rw-r--r-- | arch/nds32/math-emu/fd2ui.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/nds32/math-emu/fd2ui.c b/arch/nds32/math-emu/fd2ui.c new file mode 100644 index 000000000000..a0423b699aa4 --- /dev/null +++ b/arch/nds32/math-emu/fd2ui.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2005-2019 Andes Technology Corporation +#include <linux/uaccess.h> + +#include <asm/sfp-machine.h> +#include <math-emu/soft-fp.h> +#include <math-emu/double.h> + +void fd2ui(void *ft, void *fa) +{ + unsigned int r; + + FP_DECL_D(A); + FP_DECL_EX; + + FP_UNPACK_DP(A, fa); + + if (A_c == FP_CLS_INF) { + *(unsigned int *)ft = (A_s == 0) ? 0xffffffff : 0x00000000; + __FPU_FPCSR |= FP_EX_INVALID; + } else if (A_c == FP_CLS_NAN) { + *(unsigned int *)ft = 0xffffffff; + __FPU_FPCSR |= FP_EX_INVALID; + } else { + FP_TO_INT_ROUND_D(r, A, 32, 0); + __FPU_FPCSR |= FP_CUR_EXCEPTIONS; + *(unsigned int *)ft = r; + } + +} |