Initial revision

From-SVN: r3156

gcc/config/i386/perform.h

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+/* Definitions for AT&T assembler syntax for the Intel 80386.
+   Copyright (C) 1988 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that 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 GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Defines to be able to build libgcc.a with GCC.  */
+
+/* It might seem that these are not important, since gcc 2 will never
+   call libgcc for these functions.  But programs might be linked with
+   code compiled by gcc 1, and then these will be used.  */
+
+/* The arg names used to be a and b, but `a' appears inside strings
+   and that confuses non-ANSI cpp.  */
+
+#define perform_udivsi3(arg0,arg1)					\
+{									\
+  register int dx asm("dx");						\
+  register int ax asm("ax");						\
+									\
+  dx = 0;								\
+  ax = arg0;								\
+  asm ("divl %3" : "=a" (ax), "=d" (dx) : "a" (ax), "g" (arg1), "d" (dx)); \
+  return ax;								\
+}
+
+#define perform_divsi3(arg0,arg1)					\
+{									\
+  register int dx asm("dx");						\
+  register int ax asm("ax");						\
+									\
+  ax = arg0;								\
+  asm ("cltd\n\tidivl %3" : "=a" (ax), "=d" (dx) : "a" (ax), "g" (arg1)); \
+  return ax;								\
+}
+
+#define perform_umodsi3(arg0,arg1)					\
+{									\
+  register int dx asm("dx");						\
+  register int ax asm("ax");						\
+									\
+  dx = 0;								\
+  ax = arg0;								\
+  asm ("divl %3" : "=a" (ax), "=d" (dx) : "a" (ax), "g" (arg1), "d" (dx)); \
+  return dx;								\
+}
+
+#define perform_modsi3(arg0,arg1)					\
+{									\
+  register int dx asm("dx");						\
+  register int ax asm("ax");						\
+									\
+  ax = arg0;								\
+  asm ("cltd\n\tidivl %3" : "=a" (ax), "=d" (dx) : "a" (ax), "g" (arg1)); \
+  return dx;								\
+}
+
+#define perform_fixdfsi(arg0)						\
+{									\
+  auto unsigned short ostatus;						\
+  auto unsigned short nstatus;						\
+  auto int ret;								\
+  auto double tmp;							\
+									\
+  &ostatus;			/* guarantee these land in memory */	\
+  &nstatus;								\
+  &ret;									\
+  &tmp;									\
+									\
+  asm volatile ("fnstcw %0" : "=m" (ostatus));				\
+  nstatus = ostatus | 0x0c00;						\
+  asm volatile ("fldcw %0" : /* no outputs */ : "m" (nstatus));		\
+  tmp = arg0;								\
+  asm volatile ("fldl %0" : /* no outputs */ : "m" (tmp));		\
+  asm volatile ("fistpl %0" : "=m" (ret));				\
+  asm volatile ("fldcw %0" : /* no outputs */ : "m" (ostatus));		\
+									\
+  return ret;								\
+}
+