143 строки
4.7 KiB
C
143 строки
4.7 KiB
C
/* Machine-dependent software floating-point definitions.
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S/390 kernel version.
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Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson (rth@cygnus.com),
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Jakub Jelinek (jj@ultra.linux.cz),
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David S. Miller (davem@redhat.com) and
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Peter Maydell (pmaydell@chiark.greenend.org.uk).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef _SFP_MACHINE_H
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#define _SFP_MACHINE_H
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#define _FP_W_TYPE_SIZE 32
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#define _FP_W_TYPE unsigned long
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#define _FP_WS_TYPE signed long
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#define _FP_I_TYPE long
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#define _FP_MUL_MEAT_S(R,X,Y) \
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_FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
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#define _FP_MUL_MEAT_D(R,X,Y) \
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_FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
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#define _FP_MUL_MEAT_Q(R,X,Y) \
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_FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
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#define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_udiv(S,R,X,Y)
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#define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_2_udiv(D,R,X,Y)
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#define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
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#define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
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#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1
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#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
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#define _FP_NANSIGN_S 0
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#define _FP_NANSIGN_D 0
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#define _FP_NANSIGN_Q 0
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#define _FP_KEEPNANFRACP 1
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/*
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* If one NaN is signaling and the other is not,
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* we choose that one, otherwise we choose X.
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*/
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#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
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do { \
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if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs) \
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&& !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)) \
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{ \
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R##_s = Y##_s; \
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_FP_FRAC_COPY_##wc(R,Y); \
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} \
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else \
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{ \
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R##_s = X##_s; \
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_FP_FRAC_COPY_##wc(R,X); \
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} \
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R##_c = FP_CLS_NAN; \
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} while (0)
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/* Some assembly to speed things up. */
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#define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({ \
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unsigned int __r2 = (x2) + (y2); \
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unsigned int __r1 = (x1); \
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unsigned int __r0 = (x0); \
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asm volatile( \
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" alr %2,%3\n" \
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" brc 12,0f\n" \
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" lhi 0,1\n" \
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" alr %1,0\n" \
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" brc 12,0f\n" \
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" alr %0,0\n" \
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"0:" \
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: "+&d" (__r2), "+&d" (__r1), "+&d" (__r0) \
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: "d" (y0), "i" (1) : "cc", "0" ); \
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asm volatile( \
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" alr %1,%2\n" \
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" brc 12,0f\n" \
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" ahi %0,1\n" \
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"0:" \
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: "+&d" (__r2), "+&d" (__r1) \
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: "d" (y1) : "cc"); \
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(r2) = __r2; \
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(r1) = __r1; \
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(r0) = __r0; \
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})
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#define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0) ({ \
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unsigned int __r2 = (x2) - (y2); \
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unsigned int __r1 = (x1); \
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unsigned int __r0 = (x0); \
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asm volatile( \
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" slr %2,%3\n" \
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" brc 3,0f\n" \
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" lhi 0,1\n" \
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" slr %1,0\n" \
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" brc 3,0f\n" \
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" slr %0,0\n" \
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"0:" \
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: "+&d" (__r2), "+&d" (__r1), "+&d" (__r0) \
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: "d" (y0) : "cc", "0"); \
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asm volatile( \
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" slr %1,%2\n" \
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" brc 3,0f\n" \
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" ahi %0,-1\n" \
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"0:" \
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: "+&d" (__r2), "+&d" (__r1) \
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: "d" (y1) : "cc"); \
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(r2) = __r2; \
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(r1) = __r1; \
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(r0) = __r0; \
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})
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#define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0) __FP_FRAC_SUB_3(x2,x1,x0,x2,x1,x0,y2,y1,y0)
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/* Obtain the current rounding mode. */
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#define FP_ROUNDMODE mode
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/* Exception flags. */
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#define FP_EX_INVALID 0x800000
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#define FP_EX_DIVZERO 0x400000
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#define FP_EX_OVERFLOW 0x200000
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#define FP_EX_UNDERFLOW 0x100000
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#define FP_EX_INEXACT 0x080000
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/* We write the results always */
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#define FP_INHIBIT_RESULTS 0
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#endif
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