diff options
Diffstat (limited to 'arch/mips/math-emu/dp_add.c')
| -rw-r--r-- | arch/mips/math-emu/dp_add.c | 97 |
1 files changed, 40 insertions, 57 deletions
diff --git a/arch/mips/math-emu/dp_add.c b/arch/mips/math-emu/dp_add.c index c57c8adc42c4..78504736be9e 100644 --- a/arch/mips/math-emu/dp_add.c +++ b/arch/mips/math-emu/dp_add.c @@ -1,59 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0-only /* IEEE754 floating point arithmetic * double precision: common utilities */ /* * MIPS floating point support * Copyright (C) 1994-2000 Algorithmics Ltd. - * - * ######################################################################## - * - * This program is free software; you can distribute it and/or modify it - * under the terms of the GNU General Public License (Version 2) as - * published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. - * - * ######################################################################## - * */ - #include "ieee754dp.h" -ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y) +union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y) { + int s; + COMPXDP; COMPYDP; EXPLODEXDP; EXPLODEYDP; - CLEARCX; + ieee754_clearcx(); FLUSHXDP; FLUSHYDP; switch (CLPAIR(xc, yc)) { - case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_QNAN): case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_SNAN): - case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_SNAN): case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_SNAN): case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_SNAN): case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_SNAN): case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_SNAN): + return ieee754dp_nanxcpt(y); + + case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_SNAN): + case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_QNAN): case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_ZERO): case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_NORM): case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_DNORM): case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_INF): - SETCX(IEEE754_INVALID_OPERATION); - return ieee754dp_nanxcpt(ieee754dp_indef(), "add", x, y); + return ieee754dp_nanxcpt(x); case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_QNAN): case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_QNAN): @@ -69,14 +54,14 @@ ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y) return x; - /* Infinity handling - */ - + /* + * Infinity handling + */ case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_INF): if (xs == ys) return x; - SETCX(IEEE754_INVALID_OPERATION); - return ieee754dp_xcpt(ieee754dp_indef(), "add", x, y); + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754dp_indef(); case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_INF): case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_INF): @@ -88,15 +73,14 @@ ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y) case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_DNORM): return x; - /* Zero handling - */ - + /* + * Zero handling + */ case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_ZERO): if (xs == ys) return x; else - return ieee754dp_zero(ieee754_csr.rm == - IEEE754_RD); + return ieee754dp_zero(ieee754_csr.rm == FPU_CSR_RD); case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_ZERO): case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_ZERO): @@ -108,9 +92,7 @@ ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y) case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_DNORM): DPDNORMX; - - /* FALL THROUGH */ - + fallthrough; case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_DNORM): DPDNORMY; break; @@ -125,20 +107,24 @@ ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y) assert(xm & DP_HIDDEN_BIT); assert(ym & DP_HIDDEN_BIT); - /* provide guard,round and stick bit space */ + /* + * Provide guard,round and stick bit space. + */ xm <<= 3; ym <<= 3; if (xe > ye) { - /* have to shift y fraction right to align + /* + * Have to shift y fraction right to align. */ - int s = xe - ye; + s = xe - ye; ym = XDPSRS(ym, s); ye += s; } else if (ye > xe) { - /* have to shift x fraction right to align + /* + * Have to shift x fraction right to align. */ - int s = ye - xe; + s = ye - xe; xm = XDPSRS(xm, s); xe += s; } @@ -146,37 +132,34 @@ ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y) assert(xe <= DP_EMAX); if (xs == ys) { - /* generate 28 bit result of adding two 27 bit numbers - * leaving result in xm,xs,xe + /* + * Generate 28 bit result of adding two 27 bit numbers + * leaving result in xm, xs and xe. */ xm = xm + ym; - xe = xe; - xs = xs; - if (xm >> (DP_MBITS + 1 + 3)) { /* carry out */ + if (xm >> (DP_FBITS + 1 + 3)) { /* carry out */ xm = XDPSRS1(xm); xe++; } } else { if (xm >= ym) { xm = xm - ym; - xe = xe; - xs = xs; } else { xm = ym - xm; - xe = xe; xs = ys; } if (xm == 0) - return ieee754dp_zero(ieee754_csr.rm == - IEEE754_RD); + return ieee754dp_zero(ieee754_csr.rm == FPU_CSR_RD); - /* normalize to rounding precision */ - while ((xm >> (DP_MBITS + 3)) == 0) { + /* + * Normalize to rounding precision. + */ + while ((xm >> (DP_FBITS + 3)) == 0) { xm <<= 1; xe--; } - } - DPNORMRET2(xs, xe, xm, "add", x, y); + + return ieee754dp_format(xs, xe, xm); } |