linux/arch/mips/math-emu/sp_fdp.c
Liangliang Huang c9b0299034 MIPS: Use fallthrough for arch/mips
Convert the various /* fallthrough */ comments to the pseudo-keyword
fallthrough;

Done via script:
https://lore.kernel.org/lkml/b56602fcf79f849e733e7b521bb0e17895d390fa.1582230379.git.joe@perches.com/

Signed-off-by: Liangliang Huang <huangll@lemote.com>
Reviewed-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-05-07 11:55:47 +02:00

74 lines
1.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/* IEEE754 floating point arithmetic
* single precision
*/
/*
* MIPS floating point support
* Copyright (C) 1994-2000 Algorithmics Ltd.
*/
#include "ieee754sp.h"
#include "ieee754dp.h"
static inline union ieee754sp ieee754sp_nan_fdp(int xs, u64 xm)
{
return buildsp(xs, SP_EMAX + 1 + SP_EBIAS,
xm >> (DP_FBITS - SP_FBITS));
}
union ieee754sp ieee754sp_fdp(union ieee754dp x)
{
union ieee754sp y;
u32 rm;
COMPXDP;
COMPYSP;
EXPLODEXDP;
ieee754_clearcx();
FLUSHXDP;
switch (xc) {
case IEEE754_CLASS_SNAN:
x = ieee754dp_nanxcpt(x);
EXPLODEXDP;
fallthrough;
case IEEE754_CLASS_QNAN:
y = ieee754sp_nan_fdp(xs, xm);
if (!ieee754_csr.nan2008) {
EXPLODEYSP;
if (!ieee754_class_nan(yc))
y = ieee754sp_indef();
}
return y;
case IEEE754_CLASS_INF:
return ieee754sp_inf(xs);
case IEEE754_CLASS_ZERO:
return ieee754sp_zero(xs);
case IEEE754_CLASS_DNORM:
/* can't possibly be sp representable */
ieee754_setcx(IEEE754_UNDERFLOW);
ieee754_setcx(IEEE754_INEXACT);
if ((ieee754_csr.rm == FPU_CSR_RU && !xs) ||
(ieee754_csr.rm == FPU_CSR_RD && xs))
return ieee754sp_mind(xs);
return ieee754sp_zero(xs);
case IEEE754_CLASS_NORM:
break;
}
/*
* Convert from DP_FBITS to SP_FBITS+3 with sticky right shift.
*/
rm = (xm >> (DP_FBITS - (SP_FBITS + 3))) |
((xm << (64 - (DP_FBITS - (SP_FBITS + 3)))) != 0);
return ieee754sp_format(xs, xe, rm);
}