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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/x86/math-emu/reg_convert.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/math-emu/reg_convert.c')
-rw-r--r-- | arch/x86/math-emu/reg_convert.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/x86/math-emu/reg_convert.c b/arch/x86/math-emu/reg_convert.c new file mode 100644 index 000000000..251180623 --- /dev/null +++ b/arch/x86/math-emu/reg_convert.c @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0 +/*---------------------------------------------------------------------------+ + | reg_convert.c | + | | + | Convert register representation. | + | | + | Copyright (C) 1992,1993,1994,1996,1997 | + | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia | + | E-mail billm@suburbia.net | + | | + | | + +---------------------------------------------------------------------------*/ + +#include "exception.h" +#include "fpu_emu.h" + +int FPU_to_exp16(FPU_REG const *a, FPU_REG *x) +{ + int sign = getsign(a); + + *(long long *)&(x->sigl) = *(const long long *)&(a->sigl); + + /* Set up the exponent as a 16 bit quantity. */ + setexponent16(x, exponent(a)); + + if (exponent16(x) == EXP_UNDER) { + /* The number is a de-normal or pseudodenormal. */ + /* We only deal with the significand and exponent. */ + + if (x->sigh & 0x80000000) { + /* Is a pseudodenormal. */ + /* This is non-80486 behaviour because the number + loses its 'denormal' identity. */ + addexponent(x, 1); + } else { + /* Is a denormal. */ + addexponent(x, 1); + FPU_normalize_nuo(x); + } + } + + if (!(x->sigh & 0x80000000)) { + EXCEPTION(EX_INTERNAL | 0x180); + } + + return sign; +} |