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d876f53279
1999-12-29 Ulrich Drepper <drepper@cygnus.com> * soft-fp/*: Tons of new files to implement floating-point arithmetic in software. Contributed by Richard Henderson, Jakub Jelinek and others.
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* Software floating-point emulation.
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Compare (*a) and (*b), return float condition code.
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Copyright (C) 1997,1999 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) and
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Jakub Jelinek (jj@ultra.linux.cz).
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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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#include "soft-fp.h"
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#include "quad.h"
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int _Qp_cmp(const long double *a, const long double *b)
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{
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FP_DECL_EX;
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FP_DECL_Q(A); FP_DECL_Q(B);
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int r;
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FP_INIT_ROUNDMODE;
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FP_UNPACK_RAW_QP(A, a);
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FP_UNPACK_RAW_QP(B, b);
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FP_CMP_Q(r, B, A, 3);
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if (r == -1) r = 2;
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if (r == 3 && (FP_ISSIGNAN_Q(A) || FP_ISSIGNAN_Q(B)))
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FP_SET_EXCEPTION(FP_EX_INVALID);
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QP_HANDLE_EXCEPTIONS(
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__asm (
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"ldd [%0], %%f52
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ldd [%0+8], %%f54
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ldd [%1], %%f56
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ldd [%1+8], %%f58
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fcmpq %%fcc3, %%f52, %%f56
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" : : "r" (a), "r" (b) : QP_CLOBBER_CC);
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_FPU_GETCW(_fcw);
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r = ((_fcw >> 36) & 3));
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return r;
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}
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