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Tip revision: f443e374ae131c168a065ea1748feac6b2e76613 authored by Linus Torvalds on 20 March 2022, 20:14:17 UTC
Linux 5.17
Linux 5.17
Tip revision: f443e37
sp_flong.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"
union ieee754sp ieee754sp_flong(s64 x)
{
u64 xm; /* <--- need 64-bit mantissa temp */
int xe;
int xs;
ieee754_clearcx();
if (x == 0)
return ieee754sp_zero(0);
if (x == 1 || x == -1)
return ieee754sp_one(x < 0);
if (x == 10 || x == -10)
return ieee754sp_ten(x < 0);
xs = (x < 0);
if (xs) {
if (x == (1ULL << 63))
xm = (1ULL << 63); /* max neg can't be safely negated */
else
xm = -x;
} else {
xm = x;
}
xe = SP_FBITS + 3;
if (xm >> (SP_FBITS + 1 + 3)) {
/* shunt out overflow bits
*/
while (xm >> (SP_FBITS + 1 + 3)) {
SPXSRSX1();
}
} else {
/* normalize in grs extended single precision */
while ((xm >> (SP_FBITS + 3)) == 0) {
xm <<= 1;
xe--;
}
}
return ieee754sp_format(xs, xe, xm);
}