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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/mips/math-emu/sp_tlong.c | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/math-emu/sp_tlong.c')
-rw-r--r-- | arch/mips/math-emu/sp_tlong.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/mips/math-emu/sp_tlong.c b/arch/mips/math-emu/sp_tlong.c new file mode 100644 index 000000000..adc191304 --- /dev/null +++ b/arch/mips/math-emu/sp_tlong.c @@ -0,0 +1,96 @@ +// 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" + +s64 ieee754sp_tlong(union ieee754sp x) +{ + u32 residue; + int round; + int sticky; + int odd; + + COMPXDP; /* <-- need 64-bit mantissa tmp */ + + ieee754_clearcx(); + + EXPLODEXSP; + FLUSHXSP; + + switch (xc) { + case IEEE754_CLASS_SNAN: + case IEEE754_CLASS_QNAN: + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754di_indef(); + + case IEEE754_CLASS_INF: + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754di_overflow(xs); + + case IEEE754_CLASS_ZERO: + return 0; + + case IEEE754_CLASS_DNORM: + case IEEE754_CLASS_NORM: + break; + } + if (xe >= 63) { + /* look for valid corner case */ + if (xe == 63 && xs && xm == SP_HIDDEN_BIT) + return -0x8000000000000000LL; + /* Set invalid. We will only use overflow for floating + point overflow */ + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754di_overflow(xs); + } + /* oh gawd */ + if (xe > SP_FBITS) { + xm <<= xe - SP_FBITS; + } else if (xe < SP_FBITS) { + if (xe < -1) { + residue = xm; + round = 0; + sticky = residue != 0; + xm = 0; + } else { + residue = xm << (32 - SP_FBITS + xe); + round = (residue >> 31) != 0; + sticky = (residue << 1) != 0; + xm >>= SP_FBITS - xe; + } + odd = (xm & 0x1) != 0x0; + switch (ieee754_csr.rm) { + case FPU_CSR_RN: + if (round && (sticky || odd)) + xm++; + break; + case FPU_CSR_RZ: + break; + case FPU_CSR_RU: /* toward +Infinity */ + if ((round || sticky) && !xs) + xm++; + break; + case FPU_CSR_RD: /* toward -Infinity */ + if ((round || sticky) && xs) + xm++; + break; + } + if ((xm >> 63) != 0) { + /* This can happen after rounding */ + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754di_overflow(xs); + } + if (round || sticky) + ieee754_setcx(IEEE754_INEXACT); + } + if (xs) + return -xm; + else + return xm; +} |