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78bd5210e7
* convert.c (convert_to_real): Also optimize (float)log(x) into logf(x) where x is a float, i.e. also handle BUILT_IN_LOG{,L}. From-SVN: r63087
672 lines
20 KiB
C
672 lines
20 KiB
C
/* Utility routines for data type conversion for GNU C.
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Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, 1998,
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2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* These routines are somewhat language-independent utility function
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intended to be called by the language-specific convert () functions. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "tree.h"
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#include "flags.h"
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#include "convert.h"
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#include "toplev.h"
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#include "langhooks.h"
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#include "real.h"
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/* Convert EXPR to some pointer or reference type TYPE.
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EXPR must be pointer, reference, integer, enumeral, or literal zero;
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in other cases error is called. */
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tree
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convert_to_pointer (type, expr)
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tree type, expr;
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{
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if (integer_zerop (expr))
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{
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expr = build_int_2 (0, 0);
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TREE_TYPE (expr) = type;
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return expr;
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}
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switch (TREE_CODE (TREE_TYPE (expr)))
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{
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case POINTER_TYPE:
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case REFERENCE_TYPE:
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return build1 (NOP_EXPR, type, expr);
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case INTEGER_TYPE:
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case ENUMERAL_TYPE:
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case BOOLEAN_TYPE:
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case CHAR_TYPE:
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if (TYPE_PRECISION (TREE_TYPE (expr)) == POINTER_SIZE)
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return build1 (CONVERT_EXPR, type, expr);
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return
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convert_to_pointer (type,
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convert ((*lang_hooks.types.type_for_size)
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(POINTER_SIZE, 0), expr));
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default:
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error ("cannot convert to a pointer type");
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return convert_to_pointer (type, integer_zero_node);
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}
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}
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/* Avoid any floating point extensions from EXP. */
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tree
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strip_float_extensions (exp)
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tree exp;
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{
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tree sub, expt, subt;
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/* For floating point constant look up the narrowest type that can hold
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it properly and handle it like (type)(narrowest_type)constant.
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This way we can optimize for instance a=a*2.0 where "a" is float
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but 2.0 is double constant. */
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if (TREE_CODE (exp) == REAL_CST)
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{
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REAL_VALUE_TYPE orig;
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tree type = NULL;
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orig = TREE_REAL_CST (exp);
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if (TYPE_PRECISION (TREE_TYPE (exp)) > TYPE_PRECISION (float_type_node)
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&& exact_real_truncate (TYPE_MODE (float_type_node), &orig))
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type = float_type_node;
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else if (TYPE_PRECISION (TREE_TYPE (exp))
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> TYPE_PRECISION (double_type_node)
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&& exact_real_truncate (TYPE_MODE (double_type_node), &orig))
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type = double_type_node;
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if (type)
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return build_real (type, real_value_truncate (TYPE_MODE (type), orig));
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}
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if (TREE_CODE (exp) != NOP_EXPR)
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return exp;
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sub = TREE_OPERAND (exp, 0);
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subt = TREE_TYPE (sub);
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expt = TREE_TYPE (exp);
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if (!FLOAT_TYPE_P (subt))
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return exp;
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if (TYPE_PRECISION (subt) > TYPE_PRECISION (expt))
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return exp;
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return strip_float_extensions (sub);
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}
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/* Convert EXPR to some floating-point type TYPE.
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EXPR must be float, integer, or enumeral;
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in other cases error is called. */
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tree
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convert_to_real (type, expr)
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tree type, expr;
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{
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enum built_in_function fcode = builtin_mathfn_code (expr);
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tree itype = TREE_TYPE (expr);
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/* Disable until we figure out how to decide whether the functions are
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present in runtime. */
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/* Convert (float)sqrt((double)x) where x is float into sqrtf(x) */
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if (optimize
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&& (fcode == BUILT_IN_SQRT
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|| fcode == BUILT_IN_SQRTL
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|| fcode == BUILT_IN_SIN
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|| fcode == BUILT_IN_SINL
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|| fcode == BUILT_IN_COS
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|| fcode == BUILT_IN_COSL
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|| fcode == BUILT_IN_EXP
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|| fcode == BUILT_IN_EXPL
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|| fcode == BUILT_IN_LOG
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|| fcode == BUILT_IN_LOGL)
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&& (TYPE_MODE (type) == TYPE_MODE (double_type_node)
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|| TYPE_MODE (type) == TYPE_MODE (float_type_node)))
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{
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tree arg0 = strip_float_extensions (TREE_VALUE (TREE_OPERAND (expr, 1)));
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tree newtype = type;
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/* We have (outertype)sqrt((innertype)x). Choose the wider mode from
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the both as the safe type for operation. */
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if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (type))
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newtype = TREE_TYPE (arg0);
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/* Be curefull about integer to fp conversions.
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These may overflow still. */
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if (FLOAT_TYPE_P (TREE_TYPE (arg0))
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&& TYPE_PRECISION (newtype) < TYPE_PRECISION (itype)
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&& (TYPE_MODE (newtype) == TYPE_MODE (double_type_node)
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|| TYPE_MODE (newtype) == TYPE_MODE (float_type_node)))
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{
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tree arglist;
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tree fn = mathfn_built_in (newtype, fcode);
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if (fn)
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{
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arglist = build_tree_list (NULL_TREE, fold (convert_to_real (newtype, arg0)));
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expr = build_function_call_expr (fn, arglist);
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if (newtype == type)
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return expr;
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}
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}
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}
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if (optimize
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&& (((fcode == BUILT_IN_FLOORL
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|| fcode == BUILT_IN_CEILL
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|| fcode == BUILT_IN_ROUND
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|| fcode == BUILT_IN_TRUNC
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|| fcode == BUILT_IN_NEARBYINT)
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&& (TYPE_MODE (type) == TYPE_MODE (double_type_node)
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|| TYPE_MODE (type) == TYPE_MODE (float_type_node)))
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|| ((fcode == BUILT_IN_FLOOR
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|| fcode == BUILT_IN_CEIL
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|| fcode == BUILT_IN_ROUND
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|| fcode == BUILT_IN_TRUNC
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|| fcode == BUILT_IN_NEARBYINT)
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&& (TYPE_MODE (type) == TYPE_MODE (float_type_node)))))
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{
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tree fn = mathfn_built_in (type, fcode);
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if (fn)
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{
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tree arg0 = strip_float_extensions (TREE_VALUE (TREE_OPERAND (expr,
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1)));
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tree arglist = build_tree_list (NULL_TREE,
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fold (convert_to_real (type, arg0)));
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return build_function_call_expr (fn, arglist);
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}
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}
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/* Propagate the cast into the operation. */
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if (itype != type && FLOAT_TYPE_P (type))
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switch (TREE_CODE (expr))
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{
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/* convert (float)-x into -(float)x. This is always safe. */
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case ABS_EXPR:
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case NEGATE_EXPR:
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if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
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return build1 (TREE_CODE (expr), type,
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fold (convert_to_real (type,
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TREE_OPERAND (expr, 0))));
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break;
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/* convert (outertype)((innertype0)a+(innertype1)b)
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into ((newtype)a+(newtype)b) where newtype
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is the widest mode from all of these. */
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case PLUS_EXPR:
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case MINUS_EXPR:
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case MULT_EXPR:
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case RDIV_EXPR:
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{
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tree arg0 = strip_float_extensions (TREE_OPERAND (expr, 0));
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tree arg1 = strip_float_extensions (TREE_OPERAND (expr, 1));
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if (FLOAT_TYPE_P (TREE_TYPE (arg0))
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&& FLOAT_TYPE_P (TREE_TYPE (arg1)))
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{
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tree newtype = type;
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if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (newtype))
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newtype = TREE_TYPE (arg0);
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if (TYPE_PRECISION (TREE_TYPE (arg1)) > TYPE_PRECISION (newtype))
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newtype = TREE_TYPE (arg1);
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if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype))
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{
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expr = build (TREE_CODE (expr), newtype,
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fold (convert_to_real (newtype, arg0)),
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fold (convert_to_real (newtype, arg1)));
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if (newtype == type)
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return expr;
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}
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}
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}
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break;
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default:
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break;
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}
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switch (TREE_CODE (TREE_TYPE (expr)))
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{
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case REAL_TYPE:
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return build1 (flag_float_store ? CONVERT_EXPR : NOP_EXPR,
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type, expr);
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case INTEGER_TYPE:
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case ENUMERAL_TYPE:
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case BOOLEAN_TYPE:
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case CHAR_TYPE:
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return build1 (FLOAT_EXPR, type, expr);
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case COMPLEX_TYPE:
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return convert (type,
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fold (build1 (REALPART_EXPR,
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TREE_TYPE (TREE_TYPE (expr)), expr)));
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case POINTER_TYPE:
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case REFERENCE_TYPE:
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error ("pointer value used where a floating point value was expected");
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return convert_to_real (type, integer_zero_node);
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default:
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error ("aggregate value used where a float was expected");
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return convert_to_real (type, integer_zero_node);
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}
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}
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/* Convert EXPR to some integer (or enum) type TYPE.
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EXPR must be pointer, integer, discrete (enum, char, or bool), float, or
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vector; in other cases error is called.
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The result of this is always supposed to be a newly created tree node
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not in use in any existing structure. */
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tree
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convert_to_integer (type, expr)
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tree type, expr;
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{
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enum tree_code ex_form = TREE_CODE (expr);
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tree intype = TREE_TYPE (expr);
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unsigned int inprec = TYPE_PRECISION (intype);
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unsigned int outprec = TYPE_PRECISION (type);
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/* An INTEGER_TYPE cannot be incomplete, but an ENUMERAL_TYPE can
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be. Consider `enum E = { a, b = (enum E) 3 };'. */
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if (!COMPLETE_TYPE_P (type))
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{
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error ("conversion to incomplete type");
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return error_mark_node;
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}
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switch (TREE_CODE (intype))
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{
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case POINTER_TYPE:
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case REFERENCE_TYPE:
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if (integer_zerop (expr))
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expr = integer_zero_node;
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else
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expr = fold (build1 (CONVERT_EXPR, (*lang_hooks.types.type_for_size)
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(POINTER_SIZE, 0), expr));
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return convert_to_integer (type, expr);
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case INTEGER_TYPE:
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case ENUMERAL_TYPE:
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case BOOLEAN_TYPE:
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case CHAR_TYPE:
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/* If this is a logical operation, which just returns 0 or 1, we can
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change the type of the expression. For some logical operations,
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we must also change the types of the operands to maintain type
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correctness. */
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if (TREE_CODE_CLASS (ex_form) == '<')
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{
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TREE_TYPE (expr) = type;
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return expr;
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}
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else if (ex_form == TRUTH_AND_EXPR || ex_form == TRUTH_ANDIF_EXPR
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|| ex_form == TRUTH_OR_EXPR || ex_form == TRUTH_ORIF_EXPR
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|| ex_form == TRUTH_XOR_EXPR)
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{
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TREE_OPERAND (expr, 0) = convert (type, TREE_OPERAND (expr, 0));
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TREE_OPERAND (expr, 1) = convert (type, TREE_OPERAND (expr, 1));
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TREE_TYPE (expr) = type;
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return expr;
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}
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else if (ex_form == TRUTH_NOT_EXPR)
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{
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TREE_OPERAND (expr, 0) = convert (type, TREE_OPERAND (expr, 0));
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TREE_TYPE (expr) = type;
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return expr;
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}
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/* If we are widening the type, put in an explicit conversion.
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Similarly if we are not changing the width. After this, we know
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we are truncating EXPR. */
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else if (outprec >= inprec)
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return build1 (NOP_EXPR, type, expr);
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/* If TYPE is an enumeral type or a type with a precision less
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than the number of bits in its mode, do the conversion to the
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type corresponding to its mode, then do a nop conversion
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to TYPE. */
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else if (TREE_CODE (type) == ENUMERAL_TYPE
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|| outprec != GET_MODE_BITSIZE (TYPE_MODE (type)))
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return build1 (NOP_EXPR, type,
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convert ((*lang_hooks.types.type_for_mode)
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(TYPE_MODE (type), TREE_UNSIGNED (type)),
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expr));
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/* Here detect when we can distribute the truncation down past some
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arithmetic. For example, if adding two longs and converting to an
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int, we can equally well convert both to ints and then add.
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For the operations handled here, such truncation distribution
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is always safe.
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It is desirable in these cases:
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1) when truncating down to full-word from a larger size
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2) when truncating takes no work.
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3) when at least one operand of the arithmetic has been extended
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(as by C's default conversions). In this case we need two conversions
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if we do the arithmetic as already requested, so we might as well
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truncate both and then combine. Perhaps that way we need only one.
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Note that in general we cannot do the arithmetic in a type
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shorter than the desired result of conversion, even if the operands
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are both extended from a shorter type, because they might overflow
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if combined in that type. The exceptions to this--the times when
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two narrow values can be combined in their narrow type even to
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make a wider result--are handled by "shorten" in build_binary_op. */
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switch (ex_form)
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{
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case RSHIFT_EXPR:
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/* We can pass truncation down through right shifting
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when the shift count is a nonpositive constant. */
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if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST
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&& tree_int_cst_lt (TREE_OPERAND (expr, 1),
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convert (TREE_TYPE (TREE_OPERAND (expr, 1)),
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integer_one_node)))
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goto trunc1;
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break;
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case LSHIFT_EXPR:
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/* We can pass truncation down through left shifting
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when the shift count is a nonnegative constant and
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the target type is unsigned. */
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if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST
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&& tree_int_cst_sgn (TREE_OPERAND (expr, 1)) >= 0
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&& TREE_UNSIGNED (type)
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&& TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST)
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{
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/* If shift count is less than the width of the truncated type,
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really shift. */
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if (tree_int_cst_lt (TREE_OPERAND (expr, 1), TYPE_SIZE (type)))
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/* In this case, shifting is like multiplication. */
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goto trunc1;
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else
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{
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/* If it is >= that width, result is zero.
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Handling this with trunc1 would give the wrong result:
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(int) ((long long) a << 32) is well defined (as 0)
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but (int) a << 32 is undefined and would get a
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warning. */
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tree t = convert_to_integer (type, integer_zero_node);
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/* If the original expression had side-effects, we must
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preserve it. */
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if (TREE_SIDE_EFFECTS (expr))
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return build (COMPOUND_EXPR, type, expr, t);
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else
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return t;
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}
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}
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break;
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case MAX_EXPR:
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case MIN_EXPR:
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case MULT_EXPR:
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{
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tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type);
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tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type);
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/* Don't distribute unless the output precision is at least as big
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as the actual inputs. Otherwise, the comparison of the
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truncated values will be wrong. */
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if (outprec >= TYPE_PRECISION (TREE_TYPE (arg0))
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&& outprec >= TYPE_PRECISION (TREE_TYPE (arg1))
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/* If signedness of arg0 and arg1 don't match,
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we can't necessarily find a type to compare them in. */
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&& (TREE_UNSIGNED (TREE_TYPE (arg0))
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== TREE_UNSIGNED (TREE_TYPE (arg1))))
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goto trunc1;
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break;
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}
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case PLUS_EXPR:
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case MINUS_EXPR:
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case BIT_AND_EXPR:
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case BIT_IOR_EXPR:
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case BIT_XOR_EXPR:
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case BIT_ANDTC_EXPR:
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trunc1:
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{
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tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type);
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tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type);
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if (outprec >= BITS_PER_WORD
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|| TRULY_NOOP_TRUNCATION (outprec, inprec)
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|| inprec > TYPE_PRECISION (TREE_TYPE (arg0))
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|| inprec > TYPE_PRECISION (TREE_TYPE (arg1)))
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{
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/* Do the arithmetic in type TYPEX,
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then convert result to TYPE. */
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tree typex = type;
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/* Can't do arithmetic in enumeral types
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so use an integer type that will hold the values. */
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if (TREE_CODE (typex) == ENUMERAL_TYPE)
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typex = (*lang_hooks.types.type_for_size)
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(TYPE_PRECISION (typex), TREE_UNSIGNED (typex));
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/* But now perhaps TYPEX is as wide as INPREC.
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In that case, do nothing special here.
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(Otherwise would recurse infinitely in convert. */
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|
if (TYPE_PRECISION (typex) != inprec)
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{
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/* Don't do unsigned arithmetic where signed was wanted,
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or vice versa.
|
|
Exception: if both of the original operands were
|
|
unsigned then we can safely do the work as unsigned.
|
|
Exception: shift operations take their type solely
|
|
from the first argument.
|
|
Exception: the LSHIFT_EXPR case above requires that
|
|
we perform this operation unsigned lest we produce
|
|
signed-overflow undefinedness.
|
|
And we may need to do it as unsigned
|
|
if we truncate to the original size. */
|
|
if (TREE_UNSIGNED (TREE_TYPE (expr))
|
|
|| (TREE_UNSIGNED (TREE_TYPE (arg0))
|
|
&& (TREE_UNSIGNED (TREE_TYPE (arg1))
|
|
|| ex_form == LSHIFT_EXPR
|
|
|| ex_form == RSHIFT_EXPR
|
|
|| ex_form == LROTATE_EXPR
|
|
|| ex_form == RROTATE_EXPR))
|
|
|| ex_form == LSHIFT_EXPR)
|
|
typex = (*lang_hooks.types.unsigned_type) (typex);
|
|
else
|
|
typex = (*lang_hooks.types.signed_type) (typex);
|
|
return convert (type,
|
|
fold (build (ex_form, typex,
|
|
convert (typex, arg0),
|
|
convert (typex, arg1),
|
|
0)));
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case NEGATE_EXPR:
|
|
case BIT_NOT_EXPR:
|
|
/* This is not correct for ABS_EXPR,
|
|
since we must test the sign before truncation. */
|
|
{
|
|
tree typex = type;
|
|
|
|
/* Can't do arithmetic in enumeral types
|
|
so use an integer type that will hold the values. */
|
|
if (TREE_CODE (typex) == ENUMERAL_TYPE)
|
|
typex = (*lang_hooks.types.type_for_size)
|
|
(TYPE_PRECISION (typex), TREE_UNSIGNED (typex));
|
|
|
|
/* But now perhaps TYPEX is as wide as INPREC.
|
|
In that case, do nothing special here.
|
|
(Otherwise would recurse infinitely in convert. */
|
|
if (TYPE_PRECISION (typex) != inprec)
|
|
{
|
|
/* Don't do unsigned arithmetic where signed was wanted,
|
|
or vice versa. */
|
|
if (TREE_UNSIGNED (TREE_TYPE (expr)))
|
|
typex = (*lang_hooks.types.unsigned_type) (typex);
|
|
else
|
|
typex = (*lang_hooks.types.signed_type) (typex);
|
|
return convert (type,
|
|
fold (build1 (ex_form, typex,
|
|
convert (typex,
|
|
TREE_OPERAND (expr, 0)))));
|
|
}
|
|
}
|
|
|
|
case NOP_EXPR:
|
|
/* Don't introduce a
|
|
"can't convert between vector values of different size" error. */
|
|
if (TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == VECTOR_TYPE
|
|
&& (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0))))
|
|
!= GET_MODE_SIZE (TYPE_MODE (type))))
|
|
break;
|
|
/* If truncating after truncating, might as well do all at once.
|
|
If truncating after extending, we may get rid of wasted work. */
|
|
return convert (type, get_unwidened (TREE_OPERAND (expr, 0), type));
|
|
|
|
case COND_EXPR:
|
|
/* It is sometimes worthwhile to push the narrowing down through
|
|
the conditional and never loses. */
|
|
return fold (build (COND_EXPR, type, TREE_OPERAND (expr, 0),
|
|
convert (type, TREE_OPERAND (expr, 1)),
|
|
convert (type, TREE_OPERAND (expr, 2))));
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return build1 (NOP_EXPR, type, expr);
|
|
|
|
case REAL_TYPE:
|
|
return build1 (FIX_TRUNC_EXPR, type, expr);
|
|
|
|
case COMPLEX_TYPE:
|
|
return convert (type,
|
|
fold (build1 (REALPART_EXPR,
|
|
TREE_TYPE (TREE_TYPE (expr)), expr)));
|
|
|
|
case VECTOR_TYPE:
|
|
if (GET_MODE_SIZE (TYPE_MODE (type))
|
|
!= GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (expr))))
|
|
{
|
|
error ("can't convert between vector values of different size");
|
|
return error_mark_node;
|
|
}
|
|
return build1 (NOP_EXPR, type, expr);
|
|
|
|
default:
|
|
error ("aggregate value used where an integer was expected");
|
|
return convert (type, integer_zero_node);
|
|
}
|
|
}
|
|
|
|
/* Convert EXPR to the complex type TYPE in the usual ways. */
|
|
|
|
tree
|
|
convert_to_complex (type, expr)
|
|
tree type, expr;
|
|
{
|
|
tree subtype = TREE_TYPE (type);
|
|
|
|
switch (TREE_CODE (TREE_TYPE (expr)))
|
|
{
|
|
case REAL_TYPE:
|
|
case INTEGER_TYPE:
|
|
case ENUMERAL_TYPE:
|
|
case BOOLEAN_TYPE:
|
|
case CHAR_TYPE:
|
|
return build (COMPLEX_EXPR, type, convert (subtype, expr),
|
|
convert (subtype, integer_zero_node));
|
|
|
|
case COMPLEX_TYPE:
|
|
{
|
|
tree elt_type = TREE_TYPE (TREE_TYPE (expr));
|
|
|
|
if (TYPE_MAIN_VARIANT (elt_type) == TYPE_MAIN_VARIANT (subtype))
|
|
return expr;
|
|
else if (TREE_CODE (expr) == COMPLEX_EXPR)
|
|
return fold (build (COMPLEX_EXPR,
|
|
type,
|
|
convert (subtype, TREE_OPERAND (expr, 0)),
|
|
convert (subtype, TREE_OPERAND (expr, 1))));
|
|
else
|
|
{
|
|
expr = save_expr (expr);
|
|
return
|
|
fold (build (COMPLEX_EXPR,
|
|
type, convert (subtype,
|
|
fold (build1 (REALPART_EXPR,
|
|
TREE_TYPE (TREE_TYPE (expr)),
|
|
expr))),
|
|
convert (subtype,
|
|
fold (build1 (IMAGPART_EXPR,
|
|
TREE_TYPE (TREE_TYPE (expr)),
|
|
expr)))));
|
|
}
|
|
}
|
|
|
|
case POINTER_TYPE:
|
|
case REFERENCE_TYPE:
|
|
error ("pointer value used where a complex was expected");
|
|
return convert_to_complex (type, integer_zero_node);
|
|
|
|
default:
|
|
error ("aggregate value used where a complex was expected");
|
|
return convert_to_complex (type, integer_zero_node);
|
|
}
|
|
}
|
|
|
|
/* Convert EXPR to the vector type TYPE in the usual ways. */
|
|
|
|
tree
|
|
convert_to_vector (type, expr)
|
|
tree type, expr;
|
|
{
|
|
switch (TREE_CODE (TREE_TYPE (expr)))
|
|
{
|
|
case INTEGER_TYPE:
|
|
case VECTOR_TYPE:
|
|
if (GET_MODE_SIZE (TYPE_MODE (type))
|
|
!= GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (expr))))
|
|
{
|
|
error ("can't convert between vector values of different size");
|
|
return error_mark_node;
|
|
}
|
|
return build1 (NOP_EXPR, type, expr);
|
|
|
|
default:
|
|
error ("can't convert value to a vector");
|
|
return convert_to_vector (type, integer_zero_node);
|
|
}
|
|
}
|